Triaxial test soil sample preparation device and preparation method capable of simulating sedimentary bedding distribution

Abstract

The present invention provides a triaxial test soil sample preparation device and preparation method capable of simulating sedimentary bedding distribution, the preparation device comprising a frame, a sample compacting cylinder, a bedding positioning assembly, and a pressurizing assembly; the sample compacting cylinder has a chamber for accommodating the sample and arranged through; the bedding positioning assembly comprises a bedding thickness control rod, a first die and a second die, the first die and the second die having extrusion surfaces matching each other; the first die and the second die at least comprise a plurality of replaceable dies with different inclination angles for controlling different bedding angles; when the sample bedding is being pressed, the bedding thickness control rod and the pressurizing assembly are respectively mounted on both sides of a cylinder body and fixedly arranged with the frame, the first die is fixedly mounted at the end of the bedding thickness control rod, the second die is mounted at one end of the cylinder body facing the pressurizing assembly, or the second die is fixedly mounted at the movable end of the pressurizing assembly, and at least one of the first die and the second die can extend into the cylinder body.

Description

Technical Field

[0001] The present invention relates to the technical field of geotechnical tests, and particularly relates to a triaxial test soil sample preparation device and a preparation method capable of simulating the distribution of sedimentary bedding. Background Art

[0002] In the field of geotechnical engineering, anisotropic soils with sedimentary bedding are usually formed during the natural sedimentation process or the artificial layered compaction process of soil. As the weak interface of the soil, the distribution thickness of the sedimentary bedding varies and the spreading angles are different, which affects the strength, deformation and permeability characteristics of the layered soil, and further affects the long-term stability of the foundation and slope. Therefore, it is particularly important to carry out strength test on soils containing sedimentary bedding, and how to accurately prepare triaxial test specimens that can simulate the distribution of sedimentary bedding has always been a difficult point in this field.

[0003] However, traditional triaxial specimen preparation devices can only prepare homogeneous isotropic specimens and cannot meet the requirements for preparing specimens with sedimentary bedding. Although existing anisotropic soil sample preparation devices can prepare triaxial test specimens with different sedimentation directions, such principle devices need to first prepare anisotropic specimen blocks, then cut out triaxial test cylindrical specimens, and finally cut and trim them into standard triaxial specimens. The operation is cumbersome and cannot directly prepare standard triaxial specimens containing sedimentary bedding. At the same time, such devices do not consider the contact problem of the specimen contact surface and cannot prepare specimens with arbitrary bedding thickness distributions. Moreover, the previous triaxial test specimen preparation devices do not have the function of specimen cutting and need to manually cut the specimens into standard triaxial specimens, which causes great disturbance to the specimens.

[0004] In view of this, there is an urgent need to develop a triaxial test soil sample preparation device and method capable of simulating the distribution of sedimentary bedding, which can accurately complete a series of complex operations such as bedding positioning, bedding roughening, specimen preparation, specimen cutting and demoulding of the specimen, quickly prepare triaxial test specimens that can simulate the deposition thickness and angle of any soil layer, and greatly improve the preparation efficiency and finished product quality of the bedding specimens to meet the urgent needs of scientific research and engineering practice for strength test specimens of soils containing sedimentary bedding. Summary of the Invention

[0005] In view of this, an embodiment of the present invention provides a triaxial test soil sample preparation device and a preparation method capable of simulating the distribution of sedimentary bedding to eliminate or improve one or more defects existing in the prior art.

[0006] One aspect of the present invention provides a triaxial test soil sample preparation device capable of simulating the distribution of sedimentary bedding. The preparation device includes: a frame, a specimen compaction cylinder, a bedding positioning component, and a pressurizing component;

[0007] The specimen compaction cylinder includes a cylinder body, and the cylinder body has a chamber for accommodating the specimen and is provided with a through hole;

[0008] The bedding positioning component includes a bedding thickness control rod, a first pressing die, and a second pressing die. The first pressing die and the second pressing die have mutually cooperating extrusion surfaces. The extrusion surfaces of the two pressing dies are used to directly contact the specimen to extrude a bedding structure. The extrusion surfaces of the two pressing dies are parallel or non-parallel to each other, and the extrusion surfaces are set to be smooth or rough, flat or curved. The first pressing die and the second pressing die at least include replaceable pressing dies with multiple different inclination angles for controlling different bedding angles.

[0009] In a state where the preparation device presses the specimen bedding, the bedding thickness control rod and the pressurizing component are respectively installed on both sides of the barrel body and fixedly arranged with the frame. The first pressing die is fixedly installed at the end of the bedding thickness control rod. The second pressing die is installed at one end of the barrel body facing the pressurizing component, or the second pressing die is fixedly installed on the movable end of the pressurizing component. At least one of the first pressing die and the second pressing die can extend into the barrel body.

[0010] In some embodiments of the present invention, the specimen compaction barrel is arranged in the vertical direction. The first pressing die includes a top pressing head, and the second pressing die includes a bottom pressing head. The first pressing die and the second pressing die also both include bedding angle control pads for supporting use.

[0011] Wherein, the upper end of the top pressing head has a threaded hole or a threaded post for threaded connection with the bottom end of the bedding thickness control rod.

[0012] The lower end of the bottom pressing head has a cylindrical section for connection with the lower end of the specimen compaction barrel.

[0013] Both the lower end of the top pressing head and the upper end of the bottom pressing head have pad connection parts. The pad connection parts include an installation inclined surface and a card slot structure.

[0014] One end of the bedding angle control pad facing the pad connection part has a pressing head connection part. The pressing head connection part includes another inclined surface having the same shape as the installation inclined surface of the pressing head, and a trapezoidal guide rail protrusion matching the card slot structure.

[0015] The bottom pressing head and the top pressing head are designed as common mounting seats for the bedding angle control pads with different inclination angles.

[0016] The bedding angle control pads include multiple replaceable modules with different inclination angles, all designed as rigid beveled vertebral body structures.

[0017] In some embodiments of the present invention, the frame is in a frame structure, including a top cross beam, a slider mechanism, support columns provided on both sides, and a bottom base; the support columns provided on both sides are fixedly arranged on the bottom base, and the top cross beam is fixedly arranged on the two support columns;

[0018] A through groove penetrating in the vertical direction is provided in the middle of the top cross beam, the slider mechanism is installed at the position of the through groove, and the slider mechanism is configured to be horizontally movable along the extending direction of the through groove.

[0019] In some embodiments of the present invention, the bedding thickness control rod of the bedding positioning assembly has an external thread for threaded connection with the slider of the slider mechanism, so that the bedding thickness control rod is installed in the through groove through the slider mechanism;

[0020] The slider mechanism further includes a locking member for locking the positions of the slider mechanism and the bedding thickness control rod;

[0021] The bedding thickness control rod is further provided with a length scale distributed along its axial direction for determining the depth of the bedding thickness control rod below the slider in combination with the bottom reference surface of the slider, so as to adjust the bedding thickness of the specimen;

[0022] The bedding positioning assembly further includes a first operating member provided at the top of the bedding thickness control rod for controlling the rotation of the bedding thickness control rod;

[0023] The first operating member or the bedding thickness control rod is provided with a first bedding orientation positioning mark for indicating the inclination orientation of the extrusion surface of the first pressing die; a second bedding orientation positioning mark is provided at the bottom of the barrel body for indicating the inclination orientation of the extrusion surface of the second pressing die.

[0024] In some embodiments of the present invention, the preparation device further includes a bedding roughening assembly, and the bedding roughening assembly includes a second operating member, a rotating plate, an angle adjuster, a transmission arm, a telescopic rod, and a hair scraper;

[0025] Wherein, the bedding roughening assembly is used to be installed in the through groove of the top cross beam, the top cross beam is provided with bidirectional guide grooves penetrating in the horizontal direction on both sides of its through groove, the width of the rotating plate does not exceed the width of the through groove, and both sides of the rotating plate are provided with short shafts for being installed in the bidirectional guide grooves; wherein one short shaft on one side of the rotating plate extends out of the bidirectional guide groove for installing the angle adjuster; the rotating plate can move in the bidirectional guide groove through the short shaft to adjust its horizontal position relative to the specimen compaction cylinder and the specimen;

[0026] The second operating member is installed above the rotating plate. The transmission arm passes through the rotating plate and is installed below the rotating plate. One end of the transmission arm is connected to the second operating member, and the other end is connected to the telescopic rod through a self-locking universal joint. The hair scraper is installed at the bottom end of the telescopic rod. The rotating plate is used to control the tilting angles of the second operating member, the transmission arm, the telescopic rod, and the hair scraper.

[0027] The angle adjuster includes a knob chassis and an angle knob. The surface of the knob chassis has an angle scale, and the angle knob has an angle reference line. By rotating the angle knob, the angle adjuster drives the short shaft to rotate, and then drives the rotating plate to rotate so that its tilting angle is consistent with the sample layer. The rotation angle indicated by the angle reference line of the angle knob is configured such that the rotating plate is parallel to the sample bedding.

[0028] The second operating member is used to control the rotation of the transmission arm along its axis, so as to drive the telescopic rod and the hair scraper to perform a circular motion, enabling the hair scraper to perform a hair scraping operation on the inclined layer of the sample.

[0029] The hair scraper includes a hair scraping chassis, a hair scraping top plate, hair scraping steel needles, and a height-adjustable connecting member. Among them, the hair scraping chassis is fixedly installed at the bottom end of the telescopic rod. The hair scraping top plate is arranged at an interval and parallel to the hair scraping chassis through the height-adjustable connecting member. The hair scraping steel needles are fixedly installed on the lower end surface of the hair scraping chassis and pass through several fine holes of the hair scraping top plate. The height-adjustable connecting member is used to control the distance between the hair scraping chassis and the hair scraping top plate to change the protruding length of the hair scraping steel needles at the hair scraping top plate.

[0030] In some embodiments of the present invention, the preparation device further includes a sample cutting assembly. The sample cutting assembly includes an upper cutting group for cutting the upper end of the sample.

[0031] The upper cutting group includes a rotating disk, a cutting tool disk, a fixed disk, and a third operating member. Among them, the cutting tool disk is clamped between the rotating disk and the fixed disk. An internal thread hole is provided at the center of the fixed disk for threaded connection with the upper end of the sample compaction cylinder, thereby realizing the fixed installation of the fixed disk.

[0032] The cutting tool disk includes several groups of tapered blades that are centrosymmetric. The inner long side of the tapered blade has a cutting edge.

[0033] On the side of the fixed disk facing the cutting tool disk, several centripetal rotating guide grooves extending along an oblique line are provided. On the end face of each tapered blade facing the fixed disk, a rectangular convex guiding shaft is provided. The length of the centripetal rotating guide groove is greater than the length of the rectangular convex guiding shaft, and the widths of both are the same.

[0034] On one side of the conical blade facing the rotating disk, there is a strip-shaped groove, and on one side of the rotating disk facing the cutting tool disk, there is a circular convex guide shaft, and the diameter of the circular convex guide shaft is the same as the width of the strip-shaped groove;

[0035] At least two arc-shaped guide grooves are provided on the rotating disk near its outer edge, and the rotating disk is rotatably connected to the fixed disk through at least two connecting pieces fixed on the fixed disk and passing through the arc-shaped guide grooves; the two sides of the arc-shaped guide grooves in the horizontal direction are used to abut against the connecting pieces during the cutting process, so as to drive the cutting tool disk to rotate forward or backward;

[0036] A hole is opened at the center of the rotating disk, and the diameter of the hole is larger than the outer diameter of the specimen compaction cylinder. The third operating member is connected to the rotating disk, so that the rotating disk can be driven to rotate forward or backward by the third operating member, thereby driving each conical blade of the cutting tool disk to rotate centripetally along the centripetal rotation guide groove. During the centripetal rotation process, the regular polygon formed by each cutting edge gradually becomes smaller, so as to cut the upper end of the specimen.

[0037] In some embodiments of the present invention, the specimen cutting assembly further includes a lower cutting group for cutting the lower end of the specimen; the fixed disk of the lower cutting group is used for threaded connection with the lower end of the specimen compaction cylinder.

[0038] In some embodiments of the present invention, the pressing assembly includes a support disk, a support rod, a support plate, a sample pushing column, a tension spring, and a jacking mechanism;

[0039] The jacking mechanism includes any one of a hydraulic cylinder, a pneumatic cylinder, and a motor drive mechanism, and is used for being fixedly installed on the bottom base;

[0040] The support disk is installed on the top of the jacking mechanism through the support plate, and its two sides are connected to the bottom base through tension springs;

[0041] The support rod is installed on the top of the support disk and is used for connecting with the specimen cutting assembly or the specimen compaction cylinder;

[0042] The sample pushing column is a columnar structure with a certain length, and its outer diameter is not larger than the inner diameter of the specimen compaction cylinder. It is used to be jacked into the specimen compaction cylinder by the jacking mechanism and push out the specimen.

[0043] In some embodiments of the present invention, the specimen compaction cylinder further includes a fixing rod, a fixing collar, and a flat head rivet;

[0044] Among them, the fixing collar is used for being sleeved in the annular card slot in the middle of the cylinder body, and both sides of the fixing collar are fixedly connected to the fixing rod;

[0045] A vertical chute penetrating in the horizontal direction is provided in the middle of the support column, and the fixed rod is connected in the vertical chute through the flat head rivet at its end, and can be adjusted to a fixed connection or a slidable connection according to the positioning requirements of the cylinder body.

[0046] On the other hand, the present invention provides a method for preparing a triaxial test soil sample capable of simulating sedimentary bedding distribution, and the method includes:

[0047] Step 1: According to the required spreading angle of the prefabricated bedding of the sample, select a cushion block with a suitable angle in the bedding angle control cushion blocks of the bedding angle positioning assembly and combine it with the top press head and the bottom press head; First, align the inclined plane of the selected bedding angle control cushion block with the inclined plane of the top press head, and nest and connect it with the top press head through the trapezoidal guide rail on the inclined plane of the angle control cushion block; Subsequently, fixedly tighten the top press head and the bedding thickness control rod through threads; Finally, fix the bottom press head at the bottom of the sample compaction cylinder through the positioning card hole, and at the same time rotate the sample compaction cylinder to ensure that the inclined plane of the bottom press head is parallel to the inclined plane of the top press head. At this time, the inclination angle of the bedding angle control cushion block is the spreading angle of the prefabricated bedding;

[0048] Step 2: First, evenly pour a single portion of soil material into the bottom of the sample compaction cylinder equipped with the bedding angle control cushion block for sample compaction; Secondly, move the bedding thickness control rod of the bedding angle positioning assembly along the top cross beam of the frame to above the sample compaction cylinder, and drive the bedding thickness control rod to move downward relative to the top cross beam by rotating the first operating member and press it into the sample compaction cylinder, and then continue to drive the bedding thickness control rod to continuously penetrate into the sample compaction cylinder until the distance from the scale starting point of the rod body of the bedding thickness control rod to the bottom reference line of the slider of the frame is equal to the preset bedding thickness of the sample, then stop the movement of the bedding thickness control rod, and immediately rotate the sample compaction cylinder to align the second bedding orientation positioning mark at the bottom with the first bedding orientation positioning mark on the first operating member. At this time, the inclined plane of the top press head is parallel to the inclined plane of the bottom press head. Finally, place the support plate of the pressurizing assembly on the top of the hydraulic jack and align it with the central hole of the support disc, and then start the pressurizing assembly to push the support disc upward, thereby pushing the sample compaction cylinder to move upward along the vertical chute of the support column of the frame, and realizing the relative movement of the first mold and the second mold through the reaction force of the bedding angle positioning assembly to complete the compaction production of a single layer of bedding of the sample;

[0049] Step 3: After the single-layer bedding of the test sample is prepared, first, use the pressurizing component at the bottom of the frame to make the sample compaction cylinder reset downward along the vertical chute of the support column of the frame to the initial position, and slowly lift the bedding thickness control rod of the bedding positioning component upward and out of the sample compaction cylinder by rotating the first operating part. When it completely exits the top of the sample compaction cylinder, move the bedding thickness control rod to one side of the top crossbeam of the frame through the slider mechanism; Subsequently, move the bedding roughening component above the sample compaction cylinder through the two-way guide groove of the top crossbeam of the frame, and drive the rotating plate to rotate by rotating the angle knob. When its inclination direction is parallel to the spreading direction of the sample bedding, lock the angle knob with a pin; Finally, adjust the telescopic rod to be vertically deployed by adjusting the self-locking universal joint, and adjust the distance between the scraping top plate and the scraping bottom plate of the hair scraper by bolts. Then, set the protruding length of the scraping steel needles according to the test requirements, and at the same time adjust the length of the telescopic rod so that the scraping steel needles of the hair scraper at its bottom insert into the surface of the sample bedding. Immediately, rotate the second operating part to drive the transmission arm to rotate, and then drive the telescopic rod to drive the hair scraper to make repeated circular scraping movements along the inclined sample bedding, and the roughening treatment of the sample contact bedding can be completed;

[0050] Step 4: After the roughening of the first layer of the sample bedding is completed, the compaction of each layer of soil can be gradually completed according to the setting of the number of sample bedding layers; First, the bedding roughening component needs to be reset to the initial state and initial position before Step 3. The hair scraper can be driven by the telescopic rod of the bedding roughening component to separate from the sample compaction cylinder, and the bedding roughening component can be moved to the other side of the top crossbeam through the two-way guide groove of the top crossbeam of the frame; Secondly, according to the number of layers required for sample preparation, repeat the operations in Steps 2 and 3 continuously to complete the compaction of each layer of soil material and the roughening treatment of the bedding. Until the last layer of soil material is compacted, an inclined cylindrical sample with a preset bedding distribution can be obtained; Finally, lock the sample compaction cylinder on the vertical chute of the support column of the frame through the fixing rod, and drive the support disc to move downward through the pressurizing component, so that the fixed disc of the cutting component is separated from the bottom of the sample compaction cylinder. Immediately, take out the bottom press head fixed at the bottom of the sample compaction cylinder, and then drive the support disc to move upward again through the pressurizing component to drive the fixed disc of the cutting component to contact the bottom of the sample compaction cylinder. Immediately, tighten and fix the fixed disc and the bottom of the sample compaction cylinder through the screw bayonet for sample cutting;

[0051] Step 5: First, move the specimen compaction cylinder downward along the vertical chute of the support column of the frame so that the bedding top press head disengages from the specimen surface. When the bottom of the top press head just disengages from the top of the specimen compaction cylinder, stop moving the specimen compaction cylinder, and rotate the first operating member to drive the bedding thickness control rod downward and press it into the specimen compaction cylinder to make it come into close contact with the specimen top surface again. Secondly, start the pressurizing assembly to drive the specimen compaction cylinder to move upward along the frame, and then cooperate with the bedding thickness control rod to slowly push the specimen out from the bottom of the specimen compaction cylinder by reaction force. When the specimen compaction cylinder is in close contact with the slider mechanism of the top cross beam of the frame, the bottom beveled cylindrical surface of the specimen also completely disengages from the bottom of the specimen compaction cylinder. Immediately, drive the rotating disk of the specimen cutting assembly to rotate by the third operating member, and then drive the conical blades of the cutting tool disk to rotate centripetally synchronously. The centripetal rotation process of multiple groups of conical blades makes the blade edges continuously cut the specimen radially, thereby realizing the radial cutting of the bottom beveled cylinder of the bedding specimen by the specimen cutting assembly. Finally, after the bottom beveled cylinder of the bedding specimen is planed, rotate the first operating member to drive the bedding thickness control rod to move upward to disengage it from the specimen compaction cylinder again, and move it to one side along the top cross beam of the frame through the slider mechanism. At the same time, pass the specimen pushing rod through the center of the support disk and thread it with the hydraulic jack, and make the top of the specimen pushing rod contact the specimen at the bottom of the specimen compaction cylinder. Immediately, start the hydraulic jack of the pressurizing assembly to drive the specimen pushing rod to move upward, and the specimen can be slowly pushed out upward along the specimen compaction cylinder. When the top beveled cylindrical surface of the specimen just disengages from the top of the specimen compaction cylinder, use the specimen cutting assembly fixed to the top of the specimen compaction cylinder to perform radial cutting on the beveled cylinder at the top of the specimen. The cutting steps and process are the same as the cutting operation at the bottom of the specimen. After the top beveled cylinder of the specimen is completely planed, the cutting work of the bedding specimen is completed;

[0052] Step 6: After completing the cutting of the bedding specimen, continue to drive the specimen pushing rod fixedly connected to the hydraulic jack of the pressurizing assembly to move upward, so that it pushes the specimen out slowly from the top of the compaction cylinder through the central hole of the support disk. When the bedding specimen is completely taken out from the top of the specimen compaction cylinder, the demolding work of the bedding specimen can be completed, and a standard triaxial test specimen with a preset bedding structure can be obtained.

[0053] Compared with the complex process of traditional manual cutting and trimming, the preparation device in the embodiment of the present invention can complete the preparation of high-precision bedding specimens in a shorter time, greatly improving the preparation efficiency; through precise die pressing and bedding thickness control, the bedding structure and soil layer distribution accuracy and consistency of each specimen can be ensured; the adjustable bedding thickness control and replaceable die design enable the device to simulate different types of sedimentary bedding and meet different research needs; compared with the traditional cutting method, die pressing can better maintain the natural structure of the soil sample, avoid structural damage caused by the cutting process, and ensure the representativeness and accuracy of the specimen.

[0054] Additional advantages, objects, and features of the present invention will be partly set forth in the description which follows, and will partly become obvious to those of ordinary skill in the art upon examination of the following, or may be learned by practice of the present invention. The objects and other advantages of the present invention may be realized and attained by the structure particularly pointed out in the specification and drawings.

[0055] Those skilled in the art will understand that the objects and advantages that can be achieved by the present invention are not limited to those specifically described above, and the above and other objects that the present invention can achieve will be more clearly understood from the following detailed description. Brief Description of the Drawings

[0056] The drawings described herein are for further understanding of the present invention, form a part of this application, and do not limit the present invention. The components in the drawings are not drawn to scale, but are only for showing the principles of the present invention. For the convenience of showing and describing some parts of the present invention, the corresponding parts in the drawings may be enlarged, that is, may become larger relative to other components in the exemplary device actually manufactured according to the present invention.

[0057] Figure 1 It is a schematic perspective view of a triaxial test soil sample preparation device capable of simulating the distribution of sedimentary bedding in an embodiment of the present invention.

[0058] Figure 2 It is a schematic structural view of a bedding positioning component in an embodiment of the present invention.

[0059] Figure 3 It is a schematic structural view of a top platen, a bottom platen, and a bedding angle control spacer in an embodiment of the present invention.

[0060] Figure 4 It is a schematic structural view of a bedding roughening component in an embodiment of the present invention.

[0061] Figure 5 It is Figure 4 a partial enlarged view at A in

[0062] Figure 6 It is Figure 4 a partial enlarged view at B in

[0063] Figure 7 It is a schematic structural view of a sample compaction cylinder in an embodiment of the present invention.

[0064] Figure 8 It is a schematic structural view of the upper cutting group of a sample cutting component in an embodiment of the present invention.

[0065] Reference Numerals:

[0066] 1. Bedding positioning assembly; 11. First operating member; 12. Bedding thickness control rod; 131. Top press head; 132. Bottom press head; 14. Bedding angle control spacer block;

[0067] 2. Bedding roughening assembly; 21. Second operating member; 22. Rotating plate; 23. Angle adjuster; 231. Knob chassis; 232. Pin; 233. Angle knob; 24. Transmission arm; 25. Self-locking universal joint; 26. Telescopic rod; 27. Hair scraper; 271. Hair scraping top plate; 272. Hair scraping bottom plate; 273. Height-adjustable connecting member; 274. Hair scraping steel needle;

[0068] 3. Frame; 31. Top cross beam; 311. Through groove; 312. Bidirectional guide groove; 32. Slide block mechanism; 33. Support column; 331. Vertical chute; 34. Bottom base;

[0069] 4. Specimen compaction cylinder; 41. Cylinder body; 42. Fixed rod; 43. Fixed collar; 44. Flat head rivet;

[0070] 5. Specimen cutting assembly; 51. Rotating disk; 511. Circular convex guide shaft; 512. Arc-shaped guide groove; 52. Cutting tool disk; 521. Tapered blade; 522. Strip-shaped groove; 53. Fixed disk; 531. Centripetal rotating guide groove; 54. Screw; 55. Third operating member;

[0071] 6. Pressing assembly; 61. Support disk; 62. Support rod; 63. Support plate; 64. Specimen pushing rod; 65. Tension spring; 66. Jacking mechanism. Detailed implementation manners

[0072] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in combination with the implementation manners and the drawings. Herein, the illustrative implementation manners of the present invention and their descriptions are used to explain the present invention, but do not limit the present invention.

[0073] Herein, it also needs to be noted that in order to avoid obscuring the present invention due to unnecessary details, only the structures and / or processing steps closely related to the solution of the present invention are shown in the drawings, and other details less related to the present invention are omitted.

[0074] It should be emphasized that the term "including / containing" when used herein refers to the presence of features, elements, steps or components, but does not exclude the presence or addition of one or more other features, elements, steps or components.

[0075] Herein, it also needs to be noted that if not otherwise specified, the term "connection" in this article can not only refer to direct connection, but also represent indirect connection with an intermediate.

[0076] In the following, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar components, or the same or similar steps.

[0077] In the field of geotechnical engineering, especially when it comes to the research of layered soil and sedimentary bedding, how to accurately prepare triaxial test specimens with sedimentary bedding has always been a technical problem. The traditional triaxial specimen preparation method has certain limitations and cannot directly simulate the distribution of sedimentary bedding, which affects the accuracy and representativeness of experimental results. The embodiments of the present invention provide a triaxial test soil sample preparation device and a preparation method that can simulate the distribution of sedimentary bedding, so as to be able to quickly prepare layered triaxial test specimens that can simulate the deposition thickness and deposition angle of any soil layer, greatly improving the preparation efficiency and finished product quality of bedding specimens. In addition, the device is integrated and automated, with simple operation and stable operation, and can also cover all functions of specimen preparation, cutting, and demolding.

[0078] In the first aspect, the present invention provides a triaxial test soil sample preparation device that can simulate the distribution of sedimentary bedding, as Figures 1 - 3 shown. The preparation device includes: a frame 3, a specimen compaction cylinder 4, a bedding positioning component 1, and a pressurizing component 6. In this embodiment, the frame 3 is used to support the entire device structure; the specimen compaction cylinder 4 is mainly used to accommodate the specimen, facilitating compaction and bedding control in the chamber; the bedding positioning component 1 is the core component, used to control the thickness and angle of the sedimentary bedding; the pressurizing component 6 is responsible for applying the pressing force to ensure the formation and uniformity of the bedding structure.

[0079] As Figure 1 shown, the specimen compaction cylinder 4 includes a cylinder body 41 ( Figure 1 The cylinder body 41 in is drawn with a partial cross-section for a clear display of the internal structure). The cylinder body 41 has a chamber that is used to accommodate the specimen and is provided in a through manner. The cylinder body 41 can be selected as a hollow rigid cylinder with a smooth inner surface, which can ensure the uniformity and stability of the specimen during the compaction process.

[0080] As Figure 2 and Figure 3 shown, the bedding positioning component 1 includes a bedding thickness control rod 12, a first mold, and a second mold. Among them, the bedding thickness control rod 12 is used to accurately control the thickness of each sedimentary layer, ensuring the thickness consistency between different layers or adjusting the thickness according to actual needs. The first mold and the second mold have mutually cooperating extrusion surfaces. The extrusion surfaces of the two molds are used to directly contact the specimen to extrude the bedding structure. The extrusion surfaces of the two molds are parallel or non-parallel to each other, and the extrusion surfaces are set to be smooth or rough, flat or curved. The extrusion surfaces of these two molds are responsible for directly contacting the soil sample and extruding the sedimentary bedding structure.

[0081] In some embodiments, mutually parallel extrusion surfaces can be used to represent the uniformity of formation deposition; for example, parallel bedding structures are common in relatively stable deposition environments such as lake and marine depositions, indicating that sediments are deposited uniformly on the horizontal plane, and the parallelism between layers reflects relatively stable deposition conditions. Non-parallel extrusion surfaces are suitable for simulating the deformation of geological structures or non-uniform deposition environments. Non-parallel bedding usually appears in areas subjected to stress, deformation, or erosion, and can reflect the influence of folding, faulting, or impact on the formation, or obvious directional changes in the deposition environment. For example, in scenarios such as river environments, aeolian deposits, and tectonic zones, sediments usually form non-parallel deposition layers due to factors such as water flow, wind, and crustal movement, showing inclined, folded, or other non-uniform characteristics of the bedding.

[0082] In some other embodiments, smooth extrusion surfaces can be used to simulate relatively uniform and smooth bedding structures during natural deposition processes, such as deposition layers in lakes or deep-water environments; while rough extrusion surfaces are used to simulate deposition environments with strong frictional forces or coarser particles, such as bedding structures in rivers, aeolian deposits, or terrestrial depositions.

[0083] In some other embodiments, selecting a planar or curved extrusion surface can be for simulating different geological or deposition scenarios. The planar extrusion surface is used to simulate the situation where sediments are deposited uniformly in a horizontal or relatively flat environment. The curved extrusion surface can be used to simulate the non-uniform deposition process of topographic undulations or sediments under the action of external forces. For example, in river, aeolian, or tidal environments, the deposition of sediments is often affected by topography or hydrodynamics, forming a curved structure. Or, the curved extrusion surface is used to simulate a geological environment affected by folding, faulting, or tectonic movements, where the formation bends or tilts due to tectonic activities or sedimentation differences.

[0084] In the above embodiments, the first die and the second die at least include a plurality of replaceable dies with different inclination angles for controlling different bedding angles. The die has a plurality of replaceable options with different inclination angles, which can simulate bedding structures with different deposition angles, enhancing the adaptability and flexibility of the device.

[0085] In the state where the preparation device presses the specimen bedding, the bedding thickness control rod 12 and the pressurizing assembly 6 are respectively installed on both sides of the barrel body 41 and fixedly arranged with the frame 3. The first die is fixedly installed at the end of the bedding thickness control rod 12, and the second die is installed at one end of the barrel body 41 facing the pressurizing assembly 6, or the second die is fixedly installed on the movable end of the pressurizing assembly 6. At least one of the first die and the second die can extend into the barrel body 41.

[0086] In the above embodiments, the pressurizing assembly 6 works in cooperation with the bedding positioning assembly 1 to ensure uniform pressure applied to the specimen. This assembly can precisely control the bedding structure of the specimen by adjusting the magnitude and direction of the pressure, thereby ensuring high quality and high consistency of the experimental specimen. The compaction process of this device can have multiple options. For example, both the bedding thickness control rod 12 and the pressurizing assembly 6 can be inserted into the barrel body 41. The bedding thickness control rod 12 is set to be fixed, and the final thickness of the specimen is controlled by the stroke of the pressurizing assembly 6, thereby achieving the control of the bedding thickness. Additionally, due to the large acting force of the pressurizing assembly 6, the second mold can also be fixed on the barrel body 41. The pressurizing assembly 6 pushes the entire barrel body 41 and the second mold, combined with the reaction force of fixing different bedding thickness control rods 12, to achieve the compaction of the specimen bedding.

[0087] Compared with the complex processes of traditional manual cutting and trimming, the preparation device in the embodiments of the present invention can complete the preparation of high-precision bedding specimens in a shorter time, greatly improving the preparation efficiency; through precise molds and bedding thickness control, it can ensure the accuracy and consistency of the bedding structure and soil layer distribution of each specimen; the adjustable bedding thickness control and replaceable mold design enable the device to simulate different types of sedimentary bedding and meet different research requirements; compared with traditional cutting methods, mold forming can better maintain the natural structure of the soil sample, avoid structural damage caused by the cutting process, and ensure the representativeness and accuracy of the specimen.

[0088] The triaxial test soil sample preparation device and its preparation method capable of simulating sedimentary bedding distribution provided by the present invention can overcome the limitations of traditional preparation methods, accurately simulate the distribution, thickness, and angle of sedimentary bedding, significantly improve the preparation efficiency and finished product quality of triaxial test specimens, and have high application value. By precisely controlling the bedding structure, this device provides a more realistic and reliable soil sample preparation scheme for experimental research in geotechnical engineering, helping to improve the representativeness and accuracy of experimental results.

[0089] In some embodiments, such as Figures 1 - 3 shown, the specimen compaction cylinder 4 is used to be arranged in the vertical direction, but not limited to this. This device can be designed as a vertical structure (the axis of the barrel body 41 is along the vertical direction), or it can be designed as a horizontal structure (the axis of the barrel body 41 is along the horizontal direction), but not limited to this, and it can also be designed at any angle, such as being placed obliquely.

[0090] The mold in the embodiments of the present invention can be designed as an integrally replaceable type. For example, using a quick-connect joint connection method, the first mold and the second mold can be designed as an integral structure with an extrusion surface. If specimens with different bedding angles need to be prepared, the entire mold can be replaced.

[0091] In addition, the mold can also be designed as a split structure, such asFigure 3 As shown, as at least one implementable manner, the first die includes a top punch 131, the second die includes a bottom punch 132, and both the first die and the second die further include bedding angle control pads 14 for use in combination. In this solution, the top punch 131 and the bottom punch 132 can be used as the mounting base of the top punch 131. Considering that the inclination angles of the two bedding angle control pads 14 of the upper and lower dies need to remain stationary during the preparation process, this connection method can use a relatively simple threaded connection to achieve the connection between the punch and other structural parts, and the connection of the bedding angle control pad 14 to the punch can use a dovetail groove structure for plug-in limit to prevent it from rotating.

[0092] Specifically, the upper end of the top punch 131 has a threaded hole or a threaded post for threaded connection with the bottom end of the bedding thickness control rod 12. The lower end of the bottom punch 132 has a cylindrical section, and the cylindrical section is used for connection with the lower end of the specimen compaction cylinder 4; the bottom punch 132 can be inserted into the barrel body 41, and the outer diameter of the cylindrical section is larger than the inner diameter of the barrel body 41, serving as a sealing structure at the bottom of the barrel body 41 to ensure reliable fixation between the compaction cylinder and the bottom punch 132; to prevent relative rotation between the barrel body 41 and the bottom punch 132, a groove can be opened at the bottom of the barrel body 41, and a protrusion is designed at the corresponding position of the bottom punch 132, and the relative rotation is restricted through the cooperation of the two. As at least one implementable manner, a second bedding orientation positioning mark is provided at the bottom of the barrel body 41 for indicating the inclination orientation of the extrusion surface of the second die. The notch opened at the bottom of the barrel body 41 can be used as the second bedding orientation positioning mark for indicating the spreading direction of the specimen layer.

[0093] Furthermore, as Figure 3 shown, both the lower end of the top punch 131 and the upper end of the bottom punch 132 have a pad connection part, and the pad connection part includes a mounting inclined surface and a groove structure (which can be designed in the shape of a dovetail groove). One end of the bedding angle control pad 14 facing the pad connection part has a punch connection part, and the punch connection part includes another inclined surface with the same shape as the mounting inclined surface of the punch, and a trapezoidal guide rail protrusion matching the groove structure. The trapezoidal guide rail protrusion and the groove structure between the pad and the punch connection part enable the pad to stably cooperate with the connection part of the punch, and ensure the accuracy and firmness during the installation process. The punch connection part is designed with the same inclined surface shape as the punch, which can firmly fix the bedding angle control pad 14 and ensure that the pad always maintains the correct position and angle during the compaction process.

[0094] As at least one implementable manner, as Figure 3As shown, both the top punch 131 and the bottom punch 132 are designed as beveled cylinders. Among them, a threaded top cap (threaded post) is provided at the top of the top punch 131 for detachable connection with the bedding thickness control rod 12; the connection between the bottom punch 132 and its cylindrical section can be an integral structure or a split threaded detachable connection structure. If the two are of an integral structure, the slot structure thereof may have an opening at its top end to facilitate the entry of the spacer block.

[0095] In the above embodiment, the bottom punch 132 and the top punch 131 are designed as common mounting seats for the bedding angle control spacer blocks 14 with different inclination angles; the bedding angle control spacer blocks 14 include a plurality of or even a series of replaceable modules with different inclination angles, all of which are designed as rigid beveled cone structures. This structure improves the rigidity and durability of the spacer blocks. By replacing the modules with different inclination angles, the bedding angle formed during the compaction process can be precisely controlled to meet the experimental requirements under different geological and sedimentary conditions.

[0096] The modular design of the bedding angle control spacer blocks 14 in the embodiments of the present invention makes the device have good adjustability and flexibility. The design of the device makes it an effective tool for compacting soil, rock and other specimens and simulating the change of bedding structure in the geological environment by precisely controlling the bedding angle and various parameters during the compaction process. Through the nested combination of the positioning punch and the bedding angle control spacer block 14, a bedding pressing die with any inclination angle can be formed, thereby realizing the control of the bedding angle during the specimen pressing process. Experimenters can adjust various factors such as the bedding angle and thickness according to needs to better study the processes of sedimentation, compaction and geological change.

[0097] In some embodiments, such as Figure 1As shown, the frame 3 is of a frame structure, including a top cross beam 31, a slider mechanism 32, support columns 33 provided on both sides, and a bottom base 34; the support columns 33 provided on both sides are fixedly provided on the bottom base 34, and the top cross beam 31 is fixedly provided on the two support columns 33. Each component of the frame 3 can be fixedly connected using bolts or screws, etc. The combination of the support columns 33 and the bottom base 34 provides the rigidity and stability of the structure, enabling the frame 3 to withstand the action of external forces while maintaining the accuracy of the structure. The compactness of the frame structure design helps to reduce the occupied space, and the cooperation of each part (such as the bedding positioning component 1, the bedding roughening component 2, etc.) enables the device to operate efficiently. A through groove 311 is provided in the middle of the top cross beam 31 and runs through in the vertical direction. The slider mechanism 32 is installed at the position of the through groove 311, and the slider mechanism 32 is configured to be able to move horizontally along the extension direction of the through groove 311. The through groove 311 can be used as the installation groove for the bedding positioning component 1. Through the cooperation of the through groove 311 and the slider mechanism 32, the horizontal movement of the slider can be precisely controlled. The through groove 311 serves as a guide rail, which can reduce the sway or deviation of the bedding positioning component 1, thereby improving the accuracy.

[0098] In some embodiments, as Figure 2 shown, the bedding thickness control rod 12 of the bedding positioning component 1 has an external thread and is used for threaded connection with the slider of the slider mechanism 32, so that the bedding thickness control rod 12 is installed in the through groove 311 through the slider mechanism 32. The slider mechanism 32 further includes a locking member for locking the positions of the slider mechanism 32 and the bedding thickness control rod 12. The locking member described here can be a locking nut, or through the shaft hole fit at a specific position. For example, both the slider and the top cross beam 31 are provided with positioning holes in the vertical direction, and the horizontal limit is achieved through the pin inserted in the positioning hole.

[0099] In this way, the control rod can be stably installed on the slider and can move horizontally or vertically along the through groove 311 through the slider mechanism 32; the horizontal movement is for avoiding the position, moving away from the axis position of the barrel body 41, so that the hair scraper 27 can enter the barrel body 41 to perform the hair scraping operation on the compacted specimen bedding. The external thread connection makes the adjustment process more precise and reliable, and has a certain stability and locking property.

[0100] As Figure 2As shown, the bedding thickness control rod 12 is also provided with a length scale distributed along its axial direction, which is used to determine the depth of the bedding thickness control rod 12 below the slider in combination with the bottom reference plane of the slider, so as to adjust the bedding thickness of the specimen. The length scale can be engraved inside the thread, and the adjustment of the depth can change the bedding thickness, thereby adjusting the bedding thickness of the specimen. The function of the length scale is to provide an intuitive adjustment scale, enabling the operator to precisely control and set the bedding thickness.

[0101] In the above embodiment, the bottom reference plane of the slider can be engraved with a reference line for determining the vertical movement distance of the bedding thickness control rod 12. In other embodiments, a method of controlling the bedding thickness by controlling the movement distance with the pressing assembly 6 can also be adopted, such as using a motor drive with adjustable and controllable stroke, or being equipped with a position-adjustable travel switch, distance sensor ranging, etc.

[0102] Furthermore, the bedding positioning assembly 1 further includes a first operating member 11 provided at the top of the bedding thickness control rod 12 for controlling the rotation of the bedding thickness control rod 12; the first operating member 11 can be a manually controlled handwheel, handle or similar structure, or an automatically controlled structure such as a motor. The first operating member 11 or the bedding thickness control rod 12 is provided with a first bedding orientation positioning mark for indicating the inclination orientation of the extrusion surface of the first pressing die. This design can help the operator judge the relative inclination angle of the pressing die, ensuring the correct positioning of the pressing die and the accurate formation of the bedding during the operation. The mark of the inclination orientation can be a scale line, arrow or other visual marks for the operator to operate according to the mark.

[0103] In some embodiments, such as Figure 1 and Figure 4 As shown, the preparation device further includes a bedding roughening assembly 2, and the bedding roughening assembly 2 includes a second operating member 21, a rotating plate 22, an angle adjuster 23, a transmission arm 24, a telescopic rod 26, a hair scraper 27, etc.

[0104] Among them, the bedding roughening assembly 2 is used to be installed in the through groove 311 of the top cross beam 31, and the top cross beam 31 is provided with bidirectional guide grooves 312 that penetrate horizontally on both sides of its through groove 311, which provides an installation position and a range of movement for the subsequent rotating plate 22 (such as Figure 1(at the position on the right half side of the axis of the cylinder body 41 shown). The width of the rotating plate 22 does not exceed the width of the through groove 311, allowing the rotating plate 22 to move and flip freely within the groove. Both sides of the rotating plate 22 are provided with short shafts for installation in the bidirectional guide groove 312; wherein the short shaft on one side of the rotating plate 22 extends out of the bidirectional guide groove 312 for installing the angle adjuster 23; the rotating plate 22 can move within the bidirectional guide groove 312 through the short shaft to adjust its horizontal position relative to the specimen compaction cylinder 4 and the specimen.

[0105] Further, the second operating member 21 is installed above the rotating plate 22. The rotating plate 22 can be a square steel plate with a central opening. The transmission arm 24 passes through the rotating plate 22 and is installed below the rotating plate 22. One end of the transmission arm 24 is connected to the second operating member 21, and the other end is connected to the telescopic rod 26 through a self-locking universal joint 25. The hair scraper 27 is installed at the bottom end of the telescopic rod 26; the rotating plate 22 is used to control the tilting angle of the second operating member 21, the transmission arm 24, the telescopic rod 26, and the hair scraper 27. The second operating member 21 can be designed as a manually controlled rotating wheel, handle, knob, etc. structure, or can also be designed as an automatically controlled structure by a motor. Its function is to control the transmission arm 24 to rotate around the center of the opening of the rotating plate 22. Through the rotation of the transmission arm 24, the telescopic rod 26 and the hair scraper 27 perform circular motion, enabling the hair scraper 27 to perform precise hair scraping operations along the surface of the specimen.

[0106] Further, as Figure 6 shown, the angle adjuster 23 can manually adjust the tilting angle of the rotating plate 22 to keep it parallel to the top surface of the specimen bedding. As at least one implementable manner, the angle adjuster 23 includes a knob chassis 231 and an angle knob 233. The surface of the knob chassis 231 is provided with an angle scale, and the angle knob 233 has an angle reference line; the angle adjuster 23 drives the short shaft to rotate by rotating the angle knob 233, and further drives the rotating plate 22 to rotate, so that its tilting angle is consistent with the tilting angle of the specimen bedding. The rotation angle indicated by the angle reference line of the angle knob 233 is configured such that the rotating plate 22 is parallel to the specimen bedding. The fixing of the angle knob 233 can be achieved by means of a pin 232 at its end.

[0107] Further, the second operating member 21 is used to control the transmission arm 24 to rotate along its axis, so as to drive the telescopic rod 26 and the hair scraper 27 to perform circular motion, enabling the hair scraper 27 to perform hair scraping operations on the inclined surface of the specimen. As Figure 5As shown, the hair scraper 27 includes a hair scraping bottom plate 272, a hair scraping top plate 271, a hair scraping steel needle 274 and a height-adjustable connecting piece 273; wherein the hair scraping bottom plate 272 is fixedly mounted on the bottom end of the telescopic rod 26.

[0108] The scraper top plate 271 is spaced apart from and parallel to the scraper bottom plate 272 through a height-adjustable connector 273. The scraper steel needles 274 are fixedly mounted on the lower end surface of the scraper bottom plate 272 and pass through a number of fine holes of the scraper top plate 271. The scraper steel needles 274 can be set to any density and thickness according to actual conditions. The height-adjustable connector 273 is used to control the spacing between the scraper bottom plate 272 and the scraper top plate 271 to change the extension length of the scraper steel needles 274 at the scraper top plate 271 (in this embodiment, the extension length range of the scraper steel needles 274 can be designed to be 2-8mm). The length and position of the steel needles can be controlled by adjusting the distance between the top plate and the bottom plate, thereby achieving different degrees of surface roughening effects. The height-adjustable connector 273 can use threaded connectors, such as bolts and studs, which can easily adjust the fixed position.

[0109] It can be understood that, since the surface roughening component 2 is arranged above the barrel 41, the top of the sample can be scraped. If the lower end needs to be scraped, the sample can be turned over. In addition, in order to facilitate the scraper 27 to extend into the barrel 41 for scraping, the diameter of the scraper 27 can be designed to be smaller than the inner diameter of the barrel 41; of course, the pressurizing component 6 can also be used to push the sample so that its top is separated from the top of the barrel 41 and exposed. At this time, the scraper 27 does not need to extend into the barrel 41, and its diameter can be any size, as long as the top of the sample can be completely covered during the circumferential scraping process.

[0110] In the above embodiment, the present invention can achieve precise control of the roughening of the surface of the sample through the design of the angle adjuster 23 and the adjustable scraper 27. Whether adjusting the inclination angle of the scraper 27 or controlling the extension length of the scraper needle 274, the stability and consistency of the process can be ensured. The device is suitable for various types of samples that need to adjust the surface roughness, especially in material surface treatment, surface roughness experiments or laboratory research. The device has a simple structure and easy-to-operate operating parts. The angle scale and rotation mechanism allow the operator to quickly and accurately adjust the device to reduce human errors.

[0111] In some embodiments, in order to realize the sample cutting function in an integrated manner, the preparation device further includes a sample cutting component 5, such as Figure 1 and Figure 8As shown, the sample cutting assembly 5 includes an upper cutting group for cutting the upper end of the sample. The upper cutting group includes a rotating disk 51, a cutting tool disk 52, a fixed disk 53, and a third operating member 55. Among them, the cutting tool disk 52 is clamped between the rotating disk 51 and the fixed disk 53. An internal threaded hole is provided at the center of the fixed disk 53 for threaded connection with the upper end of the sample compaction cylinder 4, thereby realizing the fixed installation of the fixed disk 53.

[0112] The cutting tool disk 52 includes several groups of conical blades 521 that are centrosymmetric ( Figure 8 in the embodiment, there are four groups, and each group includes two blades). The inner long side of the conical blade 521 has a cutting edge. The centers of multiple groups of conical blades 521 can enclose a regular polygon shape (or the inscribed circle thereof can be regarded as a reference circle), and these conical blades 521 can move inwardly along the extension direction of the cutting edge (centripetal motion). On the side of the fixed disk 53 facing the cutting tool disk 52, there are several centripetal rotation guide grooves 531 extending obliquely. The guide grooves can be regarded as extending along the tangent direction of the reference circle. Along the straight line direction, these guide grooves provide a guiding effect for the subsequent movement of the blades. On the end face of each conical blade 521 facing the fixed disk 53, there is a rectangular convex guiding shaft. The length of the centripetal rotation guide groove 531 is greater than the length of the rectangular convex guiding shaft, and the widths of both are the same. The design of the cutting tool disk 52 ensures that the blades can move stably along the set trajectory during rotation through the centripetal rotation guide groove 531 and the rectangular convex guiding shaft.

[0113] On the side of the conical blade 521 facing the rotating disk 51 (such as Figure 8 the upper end face in the figure), there is a strip groove 522. On the side of the rotating disk 51 facing the cutting tool disk 52, there is a circular convex guiding shaft 511. The diameter of the circular convex guiding shaft 511 is the same as the width of the strip groove 522, and the length of the strip groove 522 is greater than the diameter of the guiding shaft. The design of the strip groove 522 and the circular convex guiding shaft 511 ensures the stable connection between the rotating disk 51 and the cutting tool disk 52. The circular convex guiding shaft 511 and the rectangular strip groove 522 also ensure that the conical blade 521 can be driven by the rotation of the rotating disk 51.

[0114] The rotating disk 51 is provided with at least two arc-shaped guide grooves 512 near its outer edge (as shown in the figure, the length of which is approximately 1 / 4 of the circumference of the rotating disk 51). The rotating disk 51 is inserted into the arc-shaped guide grooves 512 through at least two connecting pieces fixed on the fixed disk 53 to achieve rotatable connection with the fixed disk 53. The connecting piece can be a screw 54, that is, the fixed disk 53 is also provided with a corresponding threaded hole, and the screw 54 can axially limit the rotating disk 51 to avoid separation from the fixed disk 53 and the limiting position of the screw 54. The two sides of the arc-shaped guide groove 512 are fixed in the horizontal direction to abut against the connecting piece during the cutting process, thereby driving the cutting blade 52 to rotate forward or reverse. The rotating disk 51 has a hole in the center, and its hole diameter is larger than the outer diameter of the sample compacting cylinder 4. The third operating member 55 is connected to the rotating disk 51, so that the rotating disk 51 can be driven by the third operating member 55 to rotate forward or reverse, thereby driving the various conical blades 521 of the cutting knife disk 52 to rotate centrifugally along the centripetal rotating guide groove 531, thereby completing the synchronous radial cutting of the sample by multiple groups of conical blades 521. In other words, during the centripetal rotation process, the size of the regular polygon surrounded by the cutting edges of each conical blade 521 gradually decreases, thereby cutting the upper end of the sample. The third operating member 55 can be a handle or a handwheel.

[0115] It can be understood that in order to cut the lower end of the sample, the sample cutting assembly 5 also includes a lower cutting group for cutting the lower end of the sample; the fixing plate 53 of the lower cutting group is used to be threadedly connected with the lower end of the sample compacting cylinder 4. The structures of the upper and lower cutting groups are mirror-symmetrical along the horizontal plane, and will not be repeated here.

[0116] In the above embodiment, these designs ensure that the conical blade 521 can rotate stably along a predetermined path, and avoid deviation or jamming by accurately guiding the direction of the blade. The design of the arc guide groove 512 and the connecting piece enables the rotating disk 51 to rotate stably during the cutting process, maintaining stable contact between the cutting disc 52 and the sample. The design of the conical blade 521 not only provides a better cutting effect, but also ensures that the cutting area gradually decreases during the cutting process through centripetal rotation, and the cutting effect is more uniform. This sample cutting assembly 5 can achieve precise cutting of the upper end of the sample through the interaction of the precisely designed rotating disk 51, the cutting disc 52 and the fixed disc 53. Through the control of the third operating member 55, the cutting process can be flexibly adjusted to meet different cutting requirements. This design has high operability and stability, and is suitable for high-precision laboratory sample preparation and material cutting work.

[0117] In some embodiments, such as Figure 1As shown, the pressurizing assembly 6 includes a support disc 61, a support rod 62, a support plate 63, a sample pushing column, a tension spring 65, a jacking mechanism 66, etc. The design purpose of the pressurizing assembly 6 is to realize the pressurizing preparation of the sample, the pushing and pushing out after the preparation through the cooperation of a series of components.

[0118] The jacking mechanism 66 includes any one of a hydraulic cylinder, a pneumatic cylinder and a motor drive mechanism, and is used for fixedly installing on the bottom base 34. Through the work of these mechanisms, the required vertical driving force can be provided. In an embodiment of the present invention, a hydraulic jack can be selected, and the required compaction function can be realized with a relatively simple manual control method and low cost.

[0119] Further, the support disc 61 is installed on the top of the jacking mechanism 66 through the support plate 63, and its two sides are connected to the bottom base 34 through the tension spring 65; the support disc 61 serves as a connection platform, which can provide support and stability. The tension spring 65 is used for the quick and stable reset of the pressurizing assembly 6, and can also prevent component damage caused by excessive pressure or too fast movement.

[0120] Further, the support rod 62 is installed on the top of the support disc 61 and is used for connecting with the sample cutting assembly 5 or the sample compaction cylinder 4; the support rod 62 can provide a three-dimensional space for placing the sample pushing column; the support rod 62 also plays a role of stable support to ensure that the sample will not be subjected to unnecessary offset or interference during the compaction or cutting process.

[0121] Further, the sample pushing column is a columnar structure with a certain length, and a steel cylinder can be selected. Its outer diameter is not larger than the inner diameter of the sample compaction cylinder 4, and it is used to be jacked by the jacking mechanism 66 into the sample compaction cylinder 4 and push the sample out at the top of the cylinder body 41.

[0122] In the above embodiment, this pressurizing assembly 6 is designed to provide an efficient, adjustable and stable way to pressurize, push and push out the sample through the cooperation of multiple components. The jacking mechanism 66 provides the driving force, the support disc 61 and the support rod 62 ensure the stability of the device, the sample pushing column accurately enters the sample compaction cylinder 4 and pushes the sample, and the tension spring 65 provides elasticity and stability. This design can not only meet different test requirements, but also ensure the safety and accuracy during the operation process.

[0123] In an embodiment of the present invention, the cylinder body 41 can be set to be movable or fixedly arranged along the vertical direction according to actual operation requirements. In order to facilitate changing its connection form, a special connection method can be designed. Specifically, as Figure 1 and Figure 7 shown, the sample compaction cylinder 4 further includes a fixing rod 42, a fixing collar 43, a flat head rivet 44, etc.

[0124] Among them, the fixed collar 43 is used to be sleeved in the annular card slot in the middle of the barrel body 41, and both sides of the fixed collar 43 are fixedly connected to the fixed rod 42; in this way, the fixed collar 43 provides positioning for the middle part of the barrel body 41, ensuring that it can remain stable during operation and preventing displacement or inclination. The fixed rod 42 is a component fixedly connected to both sides of the fixed collar 43. Its function is to firmly connect the fixed collar 43 to the support column 33 or other parts, playing a role in supporting and stabilizing the barrel body 41.

[0125] Furthermore, a vertical chute 331 penetrating in the horizontal direction is provided in the middle of the support column 33, and the fixed rod 42 is connected in the vertical chute 331 through the flat head rivet 44 at its end, and can be adjusted to a fixed connection or a slidable connection according to the positioning requirements of the barrel body 41. The flat head rivet 44 is used to connect one end of the fixed rod 42 to the vertical chute 331 of the support column 33. The end of the rivet passes through the vertical chute 331, realizing the adjustable connection of the barrel body 41. According to needs, the connection method of the rivet can be adjusted to a fixed connection (i.e., fixing the position of the barrel body 41) or a slidable connection (i.e., the barrel body 41 can slide along the vertical direction).

[0126] When it is necessary to fix the barrel body 41, the fixed rod 42 is firmly connected in the vertical chute 331 of the support column 33 through the rivet, and the barrel body 41 is fixed at a specific position and cannot move up and down. When it is necessary to change the height or position of the barrel body 41, by loosening the rivet or changing the connection method of the fixed rod 42, the barrel body 41 can slide in the vertical chute 331, and after being adjusted to the required position, it is fixed again.

[0127] In the above embodiment, the present invention, through the design of the fixed collar 43, the fixed rod 42, the flat head rivet 44 and the vertical chute 331, enables the sample compaction cylinder 4 to flexibly switch between fixed and slidable states. This design not only improves the operability and adaptability of the device, but also improves the accuracy and efficiency of adjusting the position of the barrel body 41 during the test process.

[0128] A triaxial test soil sample preparation device capable of simulating the distribution of sedimentary bedding of the embodiment of the present invention can accurately and stably complete a series of complex sample preparation operations such as bedding positioning, bedding roughening, sample preparation, sample cutting and demolding of the bedding sample through the collaborative operation of the bedding positioning component, the bedding roughening component, the sample cutting component, and the pressurizing component, and can accurately prepare standard triaxial test samples that can simulate the deposition thickness and angle of any soil layer, effectively meeting the urgent needs of scientific research and engineering practice for the strength test samples of soil samples containing sedimentary bedding.

[0129] On the other hand, the present invention also provides a triaxial test soil sample preparation method based on the above preparation device, including the following steps:

[0130] Step 1 (specimen bedding angle setting step): According to the required spreading angle of the prefabricated bedding of the specimen, select a cushion block with an appropriate angle in the bedding angle control cushion block 14 of the bedding angle positioning assembly and combine it with the top punch 131 and the bottom punch 132. First, align the inclined plane of the selected bedding angle control cushion block 14 with the inclined plane of the top punch 131, and nest and connect it with the top punch 131 through the trapezoidal guide rail on the inclined plane of the angle control cushion block; then, fix and tighten the top punch 131 and the bedding thickness control rod 12 by threads; finally, fix the bottom punch 132 at the bottom of the specimen compaction cylinder 4 through the positioning card hole, and at the same time rotate the specimen compaction cylinder 4 to ensure that the inclined plane of the bottom punch 132 is parallel to the inclined plane of the top punch 131. At this time, the inclination angle of the bedding angle control cushion block 14 is the spreading angle of the prefabricated bedding.

[0131] Step 2 (specimen bedding thickness setting step): First, evenly pour a single portion of soil into the bottom of the specimen compaction cylinder 4 equipped with the bedding angle control cushion block 14 for specimen compaction; secondly, move the bedding thickness control rod 12 of the bedding angle positioning assembly along the top cross beam 31 of the frame 3 to above the specimen compaction cylinder 4, and drive the bedding thickness control rod 12 to move downward relative to the top cross beam 31 by rotating the first operating member 11 and press it into the specimen compaction cylinder 4, and then continue to drive the bedding thickness control rod 12 to continuously penetrate into the specimen compaction cylinder 4 until the distance from the scale starting point of the rod body of the bedding thickness control rod 12 to the bottom reference line of the slider of the frame 3 is equal to the preset bedding thickness of the specimen, then stop the movement of the bedding thickness control rod 12, and then rotate the specimen compaction cylinder 4 to align the second bedding orientation positioning mark at the bottom with the first bedding orientation positioning mark on the first operating member 11. At this time, the inclined plane of the top punch 131 is parallel to the inclined plane of the bottom punch 132. Finally, place the support plate 63 of the pressurizing assembly 6 on the top of the hydraulic jack and align it with the central hole of the support disc 61, and then start the pressurizing assembly 6 to push the support disc 61 to move upward, and further push the specimen compaction cylinder 4 to move upward along the vertical chute 331 of the support column 33 of the frame 3, and realize the relative movement of the first die and the second die through the reaction force of the bedding angle positioning assembly to complete the compaction production of a single layer of bedding of the specimen;

[0132] Step 3 (Sample surface roughening step): After the preparation of the single-layer bedding of the sample is completed, first, the pressure component 6 at the bottom of the frame 3 is used to reset the sample compaction cylinder 4 downward along the vertical chute 331 of the support column 33 of the frame 3 to the initial position, and the bedding thickness control rod 12 of the bedding positioning component 1 is slowly lifted upward away from the sample compaction cylinder 4 by rotating the first operating member 11. When it completely exits the top of the sample compaction cylinder 4, the bedding thickness control rod 12 is moved to one side of the top cross beam 31 of the frame 3 through the slider mechanism 32; Subsequently, the surface roughening component 2 is moved above the sample compaction cylinder 4 through the bidirectional guide groove 312 of the top cross beam 31 of the frame 3, and the rotating plate 22 is driven to rotate by rotating the angle knob 233. When its inclination direction is parallel to the spreading direction of the sample surface, the angle knob 233 is locked by the pin 232; Finally, the telescopic rod 26 is vertically spread by adjusting the self-locking universal joint 25, and the distance between the scraping top plate and the scraping bottom plate of the scraper 27 is adjusted by bolts. Furthermore, the protruding length of the scraping steel needles 274 of the scraper 27 is set according to the test requirements, and the length of the telescopic rod 26 is adjusted so that the scraping steel needles 274 of the scraper 27 at its bottom are inserted into the surface of the sample layer. Immediately, the second operating member 21 is rotated to drive the transmission arm 24 to rotate, and then the telescopic rod 26 is driven to drive the scraper 27 to perform repeated circular scraping movements along the inclined sample surface, and the roughening treatment of the sample contact layer can be completed;

[0133] Step 4 (Bedding sample preparation step): When the roughening of the first layer surface of the sample is completed, the compaction work of each layer of soil can be gradually completed according to the setting of the number of sample bedding layers. First, the surface roughening component 2 needs to be reset to the initial state and initial position before step 3. The scraper 27 can be driven by the telescopic rod 26 of the surface roughening component 2 to be separated from the sample compaction cylinder 4, and the surface roughening component 2 is moved to the other side of the top cross beam 31 through the bidirectional guide groove 312 of the top cross beam 31 of the frame 3; Secondly, according to the number of layers required for sample preparation, the operations of steps 2 and 3 are continuously repeated to complete the compaction of each layer of soil material and the roughening treatment of the surface layer. Until the compaction of the last layer of soil material is completed, an inclined cut cylindrical sample with a preset bedding distribution can be obtained; Finally, the sample compaction cylinder 4 is locked on the vertical chute 331 of the support column 33 of the frame 3 through the fixing rod 42, and the support disc 61 is driven to move downward by the pressure component 6, so that the fixed disc 53 of the cutting component is separated from the bottom of the sample compaction cylinder 4. Immediately, the bottom press head 132 fixed at the bottom of the sample compaction cylinder 4 is taken out, and then the support disc 61 is moved upward again by the pressure component 6 to drive the fixed disc 53 of the cutting component to contact the bottom of the sample compaction cylinder 4. Immediately, the fixed disc 53 is tightened and fixed to the bottom of the sample compaction cylinder 4 through the threaded bayonet for sample cutting;

[0134] Step 5 (Bedding specimen cutting step): First, move the specimen compaction cylinder 4 downward along the vertical chute 331 of the support column 33 of the frame 3 so that the bedding top press head 131 disengages from the specimen surface. When the bottom of the top press head 131 just disengages from the top of the specimen compaction cylinder 4, stop moving the specimen compaction cylinder 4, and rotate the first operating member 11 to drive the bedding thickness control rod 12 downward and press it into the specimen compaction cylinder 4 to make it come into close contact with the specimen top surface again. Secondly, start the pressurizing assembly 6 to drive the specimen compaction cylinder 4 to move upward along the frame 3, and then cooperate with the bedding thickness control rod 12 to slowly push the specimen out from the bottom of the specimen compaction cylinder 4 by reaction force. When the specimen compaction cylinder 4 is in close contact with the slider mechanism 32 of the top cross beam 31 of the frame 3, the bottom beveled cylindrical surface of the specimen also completely disengages from the bottom of the specimen compaction cylinder 4. Immediately, drive the rotating disc 51 of the specimen cutting assembly 5 to rotate by driving the third operating member 55, and then drive the conical blades 521 of the cutting tool disc 52 to rotate centripetally synchronously. The centripetal rotation process of the multiple conical blades 521 makes their blade edges continuously cut the specimen radially, so as to realize the radial cutting of the bottom beveled cylinder of the bedding specimen by the specimen cutting assembly 5. Finally, after the bottom beveled cylinder of the bedding specimen is planed, rotate the first operating member 11 to drive the bedding thickness control rod 12 to move upward to disengage it from the specimen compaction cylinder 4 again, and move it to one side along the top cross beam 31 of the frame 3 through the slider mechanism 32. At the same time, pass the specimen pushing rod 64 through the center of the support disc 61 and thread it with the hydraulic jack, and make the top of the specimen pushing rod 64 contact the specimen at the bottom of the specimen compaction cylinder 4. Immediately, start the hydraulic jack of the pressurizing assembly 6 to drive the specimen pushing rod 64 to move upward, and the specimen can be slowly pushed out upward along the specimen compaction cylinder 4. When the top beveled cylinder of the specimen just disengages from the top of the specimen compaction cylinder 4, use the specimen cutting assembly 5 fixed to the top of the specimen compaction cylinder 4 to perform radial cutting on the beveled cylinder at the top of the specimen. The cutting steps and process are the same as those of the specimen bottom cutting operation. After the top beveled cylinder of the specimen is completely planed, the cutting work of the bedding specimen is completed.

[0135] Step 6 (Bedding specimen demolding step): After the cutting of the bedding specimen is completed, continue to drive the specimen pushing rod 64 fixedly connected to the hydraulic jack of the pressurizing assembly 6 to move upward, so that it pushes the specimen out slowly from the top of the compaction cylinder through the central hole of the support disc 61. When the bedding specimen is completely removed from the top of the specimen compaction cylinder 4, the demolding work of the bedding specimen can be completed, and a standard triaxial test specimen with a preset bedding structure can be obtained.

[0136] The present invention provides a triaxial test soil sample preparation device and a preparation method capable of simulating the distribution of sedimentary bedding. Through the bedding positioning component, the setting requirements for preparing specimens with any number of bedding layers and any bedding angle can be met. Through the bedding surface roughening component, automatic and refined scraping of the contact surface of the specimen can be achieved, improving the stability of the contact surface of the specimen. Through the specimen cutting component, automatic and precise radial cutting of the bedded specimen can be achieved, overcoming the drawback that bedded specimens are fragile and difficult to cut, and improving the sample quality of the bedded specimen. Through the coordinated operation of the bedding positioning component, the bedding surface roughening component, the specimen cutting component, and the pressurizing component, a series of complex preparation processes such as bedding positioning, bedding surface roughening, specimen preparation, specimen cutting, and demolding of the bedded specimen can be stably completed. Only one device can efficiently prepare standard triaxial test specimens capable of simulating the deposition thickness and angle of any soil layer. Moreover, the device is integrated and automated, simple to operate, and stable in operation, greatly improving the preparation efficiency and finished product quality of the bedded specimen.

[0137] In the present invention, features described and / or illustrated for one embodiment can be used in the same or similar manner in one or more other embodiments, and / or combined with the features of other embodiments or replace the features of other embodiments.

[0138] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various changes and modifications can be made to the embodiments of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A triaxial test soil sample preparation device capable of simulating sedimentary bedding distribution, characterized in that: The preparation device comprises: a frame (3), a sample compacting cylinder (4), a layer positioning component (1), and a pressurizing component (6); The sample compacting cylinder (4) comprises a cylinder body (41), wherein the cylinder body (41) has a cavity which is used to accommodate the sample and is arranged through the cylinder body; The bedding positioning assembly (1) comprises a bedding thickness control rod (12), a first die and a second die, wherein the first die and the second die have extrusion surfaces that match each other, the extrusion surfaces of the two dies are used to directly contact the sample to extrude the bedding structure, the extrusion surfaces of the two dies are parallel or non-parallel to each other, and the extrusion surfaces are set to be smooth or rough, flat or curved; the first die and the second die at least include a plurality of replaceable dies with different inclination angles, which are used to control different bedding angles; When the preparation device is in a state of pressing the sample bedding, the bedding thickness control rod (12) and the pressurizing assembly (6) are respectively mounted on both sides of the barrel (41) and fixedly arranged with the frame (3), the first pressing die is fixedly mounted at the end of the bedding thickness control rod (12), the second pressing die is mounted at one end of the barrel (41) facing the pressurizing assembly (6), or the second pressing die is fixedly mounted at the movable end of the pressurizing assembly (6), and at least one of the first pressing die and the second pressing die can extend into the barrel (41); The sample compacting cylinder (4) is arranged in a vertical direction, the first pressing mold includes a top pressing head (131), the second pressing mold includes a bottom pressing head (132), and the first pressing mold and the second pressing mold also include a matching bedding angle control pad (14); the bottom pressing head (132) and the top pressing head (131) are designed as a common mounting seat for the bedding angle control pad (14) with different inclination angles; the bedding angle control pad (14) includes a plurality of replaceable modules with different inclination angles, all of which are designed as rigid beveled cone structures.

2. The triaxial test soil sample preparation device capable of simulating sedimentary bedding distribution according to claim 1, characterized in that: in, The upper end of the top pressure head (131) has a threaded hole or a threaded column for threaded connection with the bottom end of the bedding thickness control rod (12); The lower end of the bottom pressure head (132) has a cylindrical section, and the cylindrical section is used to connect with the lower end of the sample compacting cylinder (4); The lower end of the top pressure head (131) and the upper end of the bottom pressure head (132) both have a pad connection portion, and the pad connection portion comprises a mounting inclined surface and a slot structure; The bedding angle control pad (14) has a pressure head connection portion at one end facing the pad connection portion, and the pressure head connection portion comprises another inclined surface of the same shape as the installation inclined surface of the pressure head, and a trapezoidal guide rail protrusion matching the slot structure.

3. The triaxial test soil sample preparation device capable of simulating sedimentary bedding distribution according to claim 1, characterized in that: The frame (3) is in a frame structure, comprising a top crossbeam (31), a slider mechanism (32), support columns (33) arranged on both sides, and a bottom base (34); the support columns (33) arranged on both sides are fixedly arranged on the bottom base (34), and the top crossbeam (31) is fixedly arranged on the two support columns (33); The middle portion of the top crossbeam (31) has a through slot (311) extending through the top crossbeam (31) in a vertical direction. The slider mechanism (32) is installed in the through slot (311). The slider mechanism (32) is configured to be able to move horizontally along the extension direction of the through slot (311).

4. The triaxial test soil sample preparation device capable of simulating sedimentary bedding distribution according to claim 3, characterized in that: The bedding thickness control rod (12) of the bedding positioning assembly (1) has an external thread for being threadedly connected to a slider of the slider mechanism (32), so that the bedding thickness control rod (12) is installed in the through groove (311) through the slider mechanism (32); The slider mechanism (32) further comprises a locking member, which is used to lock the position of the slider mechanism (32) and the layer thickness control rod (12); The bedding thickness control rod (12) is also provided with a length scale distributed along its axial direction, which is used to determine the depth of the bedding thickness control rod (12) below the slider in combination with the bottom reference surface of the slider, so as to adjust the bedding thickness of the sample; The bedding positioning assembly (1) further comprises a first operating member (11) arranged on the top of the bedding thickness control rod (12) and used for controlling the rotation of the bedding thickness control rod (12); The first operating member (11) or the bedding thickness control rod (12) is provided with a first bedding orientation positioning mark for indicating the inclination orientation of the extrusion surface of the first die; the bottom of the barrel (41) is provided with a second bedding orientation positioning mark for indicating the inclination orientation of the extrusion surface of the second die.

5. The triaxial test soil sample preparation device capable of simulating sedimentary bedding distribution according to claim 3, characterized in that: The preparation device further comprises a layer roughening assembly (2), wherein the layer roughening assembly (2) comprises a second operating member (21), a rotating plate (22), an angle adjuster (23), a transmission arm (24), a telescopic rod (26) and a scraper (27); The surface roughening assembly (2) is used to be installed in the through groove (311) of the top crossbeam (31); the top crossbeam (31) is provided with horizontally penetrating two-way guide grooves (312) on both sides of its through groove (311); the width of the rotating plate (22) does not exceed the width of the through groove (311); the rotating plate (22) has short shafts on both sides for being installed in the two-way guide groove (312); the short shaft on one side of the rotating plate (22) extends out of the two-way guide groove (312) for installing the angle adjuster (23); the rotating plate (22) can move in the two-way guide groove (312) via the short shaft to adjust its horizontal position relative to the sample compacting cylinder (4) and the sample; The second operating member (21) is mounted above the rotating plate (22); the transmission arm (24) passes through the rotating plate (22) and is mounted below the rotating plate (22); one end of the transmission arm (24) is connected to the second operating member (21); the other end of the transmission arm (24) is connected to the telescopic rod (26) via a self-locking universal joint (25); the hair scraper (27) is mounted at the bottom end of the telescopic rod (26); the rotating plate (22) is used to control the tilt angles of the second operating member (21), the transmission arm (24), the telescopic rod (26) and the hair scraper (27); The angle adjuster (23) comprises a knob chassis (231) and an angle knob (233); the surface of the knob chassis (231) has an angle scale, and the angle knob (233) has an angle reference line; the angle adjuster (23) drives the short axis to rotate by rotating the angle knob (233), thereby driving the rotating plate (22) to rotate so that the rotating plate (22) is consistent with the inclination angle of the sample layer, and the rotation angle indicated by the angle reference line of the angle knob (233) is configured so that the rotating plate (22) is parallel to the sample layer; The second operating member (21) is used to control the transmission arm (24) to rotate along its axis, so as to drive the telescopic rod (26) and the scraper (27) to perform circular motion, so that the scraper (27) can perform a scraping operation on the inclined surface of the sample; The scraper (27) comprises a scraper bottom plate (272), a scraper top plate (271), a scraper steel needle (274) and a height-adjustable connecting piece (273); wherein the scraper bottom plate (272) is fixedly mounted on the bottom end of the telescopic rod (26); the scraper top plate (271) is spaced apart from and parallel to the scraper bottom plate (272) via the height-adjustable connecting piece (273); the scraper steel needle (274) is fixedly mounted on the lower end surface of the scraper bottom plate (272) and passes through a plurality of fine holes of the scraper top plate (271); the height-adjustable connecting piece (273) is used to control the distance between the scraper bottom plate (272) and the scraper top plate (271) so as to change the protruding length of the scraper steel needle (274) at the scraper top plate (271).

6. The triaxial test soil sample preparation device capable of simulating sedimentary bedding distribution according to claim 3, characterized in that: The preparation device further comprises a sample cutting assembly (5), wherein the sample cutting assembly (5) comprises an upper cutting group for cutting the upper end of the sample; The upper cutting group comprises a rotating disk (51), a cutting disc (52), a fixed disk (53) and a third operating member (55); wherein the cutting disc (52) is sandwiched between the rotating disk (51) and the fixed disk (53); an internal threaded hole is provided at the center of the fixed disk (53) for being threadedly connected to the upper end of the sample compacting cylinder (4), thereby achieving fixed installation of the fixed disk (53); The cutting blade disc (52) comprises a plurality of groups of conical blades (521) which are centrally symmetrical, and the inner long sides of the conical blades (521) have cutting edges; A plurality of centripetal rotation guide grooves (531) extending along an oblique line are provided on a side of the fixed disk (53) facing the cutting blade disk (52); a rectangular protruding guide shaft is provided on the end surface of each conical blade (521) facing the fixed disk (53); the length of the centripetal rotation guide groove (531) is greater than the length of the rectangular protruding guide shaft, and the two have the same width; A strip groove (522) is provided on one side of the conical blade (521) facing the rotating disk (51), and a circular protruding guide shaft (511) is provided on one side of the rotating disk (51) facing the cutting blade disk (52), wherein the diameter of the circular protruding guide shaft (511) is the same as the width of the strip groove (522); The rotating disk (51) is provided with at least two arc-shaped guide grooves (512) close to the outer edge thereof; the rotating disk (51) is inserted into the arc-shaped guide grooves (512) via at least two connecting pieces fixed to the fixed disk (53), thereby realizing a rotatable connection with the fixed disk (53); the two sides of the arc-shaped guide grooves (512) in the horizontal direction are used to abut against the connecting pieces during the cutting process, thereby driving the cutting disc (52) to rotate forward or reversely; The rotating disk (51) has a central opening, the diameter of which is larger than the outer diameter of the sample compacting cylinder (4). The third operating member (55) is connected to the rotating disk (51), so that the rotating disk (51) can be driven by the third operating member (55) to rotate forward or reverse, thereby driving the various conical blades (521) of the cutting disc (52) to rotate centripetally along the centripetal rotating guide groove (531). During the centripetal rotation process, the regular polygon formed by the cutting edges gradually becomes smaller, thereby cutting the upper end of the sample.

7. The triaxial test soil sample preparation device capable of simulating sedimentary bedding distribution according to claim 6, characterized in that: The sample cutting assembly (5) further comprises a lower cutting group for cutting the lower end of the sample; the fixing plate (53) of the lower cutting group is used for threaded connection with the lower end of the sample compacting cylinder (4).

8. The triaxial test soil sample preparation device capable of simulating sedimentary bedding distribution according to claim 7, characterized in that: The pressurizing assembly (6) comprises a supporting disc (61), a supporting rod (62), a supporting plate (63), a sample pushing column, a tension spring (65) and a lifting mechanism (66); The lifting mechanism (66) comprises any one of a hydraulic cylinder, a pneumatic cylinder and a motor drive mechanism, and is used for being fixedly mounted on the bottom base (34); The support disc (61) is installed on the top of the lifting mechanism (66) via the support plate (63), and two sides thereof are connected to the bottom base (34) via tension springs (65); The support rod (62) is mounted on the top of the support disc (61) and is used to connect with the sample cutting assembly (5) or the sample compacting cylinder (4); The sample pushing column is a columnar structure of a certain length, the outer diameter of which is not greater than the inner diameter of the sample compacting cylinder (4), and is used to be lifted by the lifting mechanism (66) into the sample compacting cylinder (4) and push the sample out.

9. The triaxial test soil sample preparation device capable of simulating sedimentary bedding distribution according to claim 3, characterized in that: The sample compacting cylinder (4) further comprises a fixing rod (42), a fixing collar (43) and a flat head rivet (44); The fixing collar (43) is used to be sleeved in the annular groove in the middle of the barrel (41), and two sides of the fixing collar (43) are fixedly connected to the fixing rod (42); A vertical slide groove (331) is provided in the middle of the support column (33) and runs through in the horizontal direction. The fixing rod (42) is connected to the vertical slide groove (331) via the flat head rivet (44) at its end, and can be adjusted to a fixed connection or a slidable connection according to the positioning requirements of the barrel (41).

10. A method for preparing a triaxial test soil sample capable of simulating sedimentary bedding distribution, the method comprising: Step 1: According to the requirement of the prefabricated bedding distribution angle of the sample, a bedding angle control pad (14) of the bedding angle positioning assembly is selected to combine with the top pressure head (131) and the bottom pressure head (132); first, the beveled surface of the selected bedding angle control pad (14) is aligned with the beveled surface of the top pressure head (131), and the bedding angle control pad is nested and connected with the top pressure head (131) through the trapezoidal guide rail on the beveled surface of the bedding angle control pad; then, the top pressure head (131) and the bedding thickness control rod (12) are screwed and tightened; finally, the bottom pressure head (132) is fixed to the bottom of the sample compaction cylinder (4) through the positioning card hole, and the sample compaction cylinder (4) is rotated at the same time to ensure that the beveled surface of the bottom pressure head (132) is parallel to the beveled surface of the top pressure head (131). At this time, the inclination angle of the bedding angle control pad (14) is the distribution angle of the prefabricated bedding; Step 2: First, pour a single portion of soil material evenly into the bottom of the sample compaction cylinder (4) equipped with a bedding angle control pad (14) to prepare for sample compaction; second, move the bedding thickness control rod (12) of the bedding angle positioning assembly along the top crossbeam (31) of the frame (3) to the top of the sample compaction cylinder (4), and drive the bedding thickness control rod (12) to move downward relative to the top crossbeam (31) by rotating the first operating member (11) and press it into the sample compaction cylinder (4), and then continue to drive the bedding thickness control rod (12) to continuously penetrate into the sample compaction cylinder (4) until the distance between the scale starting point of the bedding thickness control rod (12) and the bottom reference line of the slider of the frame (3) is equal to the preset bedding thickness of the sample, then the bedding thickness control rod can be stopped. The rod (12) is moved, and the sample compacting cylinder (4) is then rotated so that the second bedding orientation positioning mark at the bottom thereof is aligned with the first bedding orientation positioning mark on the first operating member (11). At this time, the beveled surface of the top pressure head (131) is parallel to the beveled surface of the bottom pressure head (132). Finally, the support plate (63) of the pressure component (6) is placed on the top of the hydraulic jack and aligned with the center hole of the support disc (61). The pressure component (6) is then started to push the support disc (61) upward, thereby pushing the sample compacting cylinder (4) upward along the vertical slide groove (331) of the support column (33) of the frame (3). The relative movement of the first die and the second die is achieved through the reaction force of the bedding angle positioning component, thereby completing the compaction of the single-layer bedding of the sample; Step 3: After the single-layer bedding of the sample is prepared, first, the pressure component (6) at the bottom of the frame (3) is used to reset the sample compacting cylinder (4) downward along the vertical slide groove (331) of the support column (33) of the frame (3) to the initial position, and the bedding thickness control rod (12) of the bedding positioning component (1) is slowly disengaged from the sample compacting cylinder (4) upward by rotating the first operating member (11). When it is completely out of the top of the sample compacting cylinder (4), the bedding thickness control rod (12) is moved to one side of the top crossbeam (31) of the frame (3) through the slider mechanism (32); then, the layer roughening component (2) is moved to the top of the sample compacting cylinder (4) through the double-direction guide groove (312) of the top crossbeam (31) of the frame (3), and the angle knob (233) is rotated. The rotating plate (22) is driven to rotate, and when its tilting direction is parallel to the spreading direction of the sample layer, the rotation angle knob (233) is locked by a pin; finally, the telescopic rod (26) is vertically spread by adjusting the self-locking universal joint (25), and the distance between the scraping top plate and the scraping bottom plate of the scraper (27) is adjusted by a bolt, and then the extension length of the scraping steel needle (274) is set according to the test requirements, and at the same time, the length of the telescopic rod (26) is adjusted so that the scraping steel needle (274) of the scraper (27) at the bottom thereof is inserted into the surface of the sample layer, and then the second operating member (21) is rotated to drive the transmission arm (24) to rotate, and then the telescopic rod (26) is driven to drive the scraper (27) to perform repeated circular scraping motions along the tilted sample layer, thereby completing the roughening treatment of the contact layer of the sample; Step 4: After the roughening of the first layer of the sample is completed, the compaction of each layer of soil can be gradually completed according to the number of layers set for the sample. First, the roughening component (2) needs to be reset to the initial state and initial position before step 3. The scraper (27) can be driven to detach from the sample compaction cylinder (4) through the telescopic rod (26) of the roughening component (2), and the roughening component (2) can be moved to the other side of the top beam (31) through the double guide groove (312) of the top beam (31) of the frame (3). Secondly, according to the number of layers required for sample preparation, steps 2 and 3 are repeated continuously to complete the compaction of each layer of soil and the roughening of the layer until the last layer of soil is compacted. Finally, the sample compacting cylinder (4) is locked to the vertical slide groove (331) of the supporting column (33) of the frame (3) through the fixing rod (42), and the supporting disc (61) is driven downward by the pressurizing assembly (6), so that the fixing disc (53) of the cutting assembly is separated from the bottom of the sample compacting cylinder (4), and then the bottom pressure head (132) fixed to the bottom of the sample compacting cylinder (4) is taken out, and then the supporting disc (61) is moved upward again by the pressurizing assembly (6) to drive the fixing disc (53) of the cutting assembly to contact the bottom of the sample compacting cylinder (4), and then the fixing disc (53) is tightened and fixed to the bottom of the sample compacting cylinder (4) through the threaded bayonet, so as to prepare for sample cutting; Step 5: First, the sample compacting cylinder (4) is moved downward along the vertical slide groove (331) of the support column (33) of the frame (3) to separate the bedding top pressure head (131) from the sample surface. When the bottom of the top pressure head (131) just separates from the top of the sample compacting cylinder (4), the movement of the sample compacting cylinder (4) is stopped, and the first operating member (11) is rotated to drive the bedding thickness control rod (12) to move downward and press into the sample compacting cylinder (4) so ​​that it is in close contact with the top surface of the sample again. Secondly, the pressurizing assembly (6) is started to drive the sample compacting cylinder (4) along the frame (3). The sample is moved upward, thereby cooperating with the bedding thickness control rod (12) to slowly disengage the sample from the bottom of the sample compacting cylinder (4) through the reaction force. When the sample compacting cylinder (4) is in close contact with the slider mechanism (32) of the top crossbeam (31) of the frame (3), the oblique cylindrical surface at the bottom of the sample is also completely disengaged from the bottom of the sample compacting cylinder (4). Then, the rotating disk (51) of the sample cutting assembly (5) is driven to rotate through the third operating member (55), thereby driving the conical blade (521) of the cutting disc (52) to rotate synchronously. The centripetal rotation process of the multiple groups of conical blades (521) causes The cutting edge of the blade continuously cuts the sample in the radial direction, thereby realizing radial cutting of the beveled cylinder at the bottom of the bedding sample by the sample cutting assembly (5); finally, after the beveled cylinder at the bottom of the bedding sample is flattened, the first operating member (11) is rotated to drive the bedding thickness control rod (12) to move upward so that it can be disengaged from the sample compacting cylinder (4) again, and the slider mechanism (32) is used to move it to one side along the top crossbeam (31) of the frame (3), and at the same time, the sample pushing rod (64) is passed through the center of the support disc (61) and is threadedly connected to the hydraulic jack, and the top of the sample pushing rod (64) is aligned with the sample. The sample is in contact with the sample at the bottom of the sample compacting cylinder (4), and the hydraulic jack of the pressurizing assembly (6) is then started to drive the sample push rod (64) to move upward, so that the sample can be slowly ejected upward along the sample compacting cylinder (4). When the beveled cylindrical surface at the top of the sample just comes out of the top of the sample compacting cylinder (4), the sample is ejected. The beveled cylindrical body at the top of the sample is radially cut by the sample cutting assembly (5) fixed to the top of the sample compacting cylinder (4). The cutting steps and process are the same as the cutting operation at the bottom of the sample. When the beveled cylindrical body at the top of the sample is completely flattened, the cutting work of the bedding sample is completed. Step 6: After the bedding sample is cut, the sample push rod (64) fixedly connected to the hydraulic jack of the pressurizing assembly (6) is driven upward to push the sample through the center hole of the support disc (61) and slowly release it from the top of the compacting cylinder. When the bedding sample is completely released from the top of the sample compacting cylinder (4), the demoulding work of the bedding sample is completed, and a standard triaxial test sample with a preset bedding structure is obtained.

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