Three-way static pressure preparation device for geotechnical sample and use method of three-way static pressure preparation device

Abstract

The invention discloses a geotechnical sample three-way static pressure preparation device and a use method thereof. The geotechnical sample three-way static pressure preparation device comprises a base, a forming mold and a loading mechanism. The forming mold is arranged on the base and comprises a mold body and a top cover, the mold body is provided with an opening located in the side face and end openings located in the two ends, and the top cover is rotationally connected to the mold body and used for sealing the opening and primarily extruding a soil sample in the forming mold. The loading mechanism comprises a first loading mechanism and a second loading mechanism which are arranged on the base, and the first loading mechanism and the second loading mechanism extend into the forming mold from two ports of the forming mold to extrude a soil sample in the forming mold. According to the device and the method, a three-way static pressure mode is innovatively designed, so that side extrusion and two-end extrusion of the soil sample are realized, the uniformity of the prepared soil sample can be ensured, the compaction condition that the interior is loose and the exterior is compact or the two ends are compact and the middle is loose is avoided, and the accuracy of a test result is ensured.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering mechanics, specifically to a triaxial static pressure preparation device for geotechnical specimens and its usage method. Background Technology

[0002] The main physical and mechanical properties of natural soil samples are affected by various factors, resulting in significant differences between individual samples. When using natural soil to study the influence of stress conditions on the dynamic properties of soil, the coupling effect caused by the differences in physical and mechanical properties between individual samples will have a significant impact on the test results, making it difficult to define the influence of stress conditions on the dynamic properties of natural soil samples.

[0003] Therefore, preparing uniform remolded natural soil samples with minimal individual variation helps in accurately analyzing the influence of stress conditions on the dynamic properties of loess and its underlying mechanisms. However, current methods of using remolded samples result in unevenness in the prepared geotechnical specimens, affecting the accuracy of the test results. Summary of the Invention

[0004] Therefore, it is necessary to provide a geotechnical specimen triaxial static pressure preparation device and its usage method, addressing the issue of unevenness in geotechnical specimens prepared by existing reshaped specimen application methods.

[0005] A geotechnical specimen triaxial static pressure preparation device, comprising: Base; A molding die, mounted on the base, includes a die body and a top cover. The die body has an opening on the side and ports at both ends. The top cover is rotatably connected to the die body and is used to close the opening and initially compress the soil sample inside the molding die. The loading mechanism includes a first loading mechanism and a second loading mechanism disposed on the base. The first loading mechanism and the second loading mechanism are located at opposite ends of the molding mold. The first loading mechanism and the second loading mechanism extend into the molding mold from two ports of the molding mold to compress the soil sample inside the molding mold.

[0006] In one embodiment, a fixing structure is also included. The molding die includes multiple segments, which are sequentially assembled to form the molding die. The fixing structure is used to fix the multiple segments in series.

[0007] In one embodiment, the fixing structure includes a fixing baffle, a reinforcing baffle, a flange, and a tie rod. The fixing baffle and the reinforcing baffle are installed on the base. The two ends of the tie rod are respectively installed on the fixing baffle and the reinforcing baffle. The tie rod connects multiple segments in series. The flange is installed on the tie rod and cooperates with the fixing baffle to clamp and fix the molding mold.

[0008] In one embodiment, the top cover is provided with a self-locking structure that is detachably connected to the mold body.

[0009] In one embodiment, the first loading mechanism includes a top-pressure drive and a first pad, the top-pressure drive being adjustablely mounted on the base, the top-pressure drive compressing the soil through the first pad.

[0010] In one embodiment, the second loading mechanism includes a removable baffle, a top pressure rod, a pressure spring, and a second pad. The removable baffle is mounted on the base, the pressure spring is mounted on the removable baffle, and the pressure spring compresses the soil through the second pad. The top pressure rod is detachably mounted on the removable baffle and has a first state of being mounted on the removable baffle and pressing against the second pad, and a second state of being removed from the removable baffle.

[0011] In one embodiment, the detachable baffle is provided with a threaded hole, and the top pressure rod is provided with a threaded section that mates with the threaded hole.

[0012] A method for using a triaxial static pressure preparation device for geotechnical specimens, comprising the following steps: Open the top cover of the molding mold and put the soil sample into the molding mold; Rotating the top cover initially compacts the soil sample and closes the opening of the molding mold. The first and second loading mechanisms are inserted into the molding mold from both ends to compress the soil sample inside the molding mold.

[0013] In one embodiment, the method of use is specifically as follows: Open the top cover in the middle of the molding mold and put the soil sample into the molding mold; Rotating the top cover initially compacts the soil sample and closes the opening of the molding mold. The first loading mechanism and the second loading mechanism are inserted into the molding mold from both ends to compress the soil sample inside the molding mold. Open all the top covers of the molding mold and add new soil samples to both sides of the already compacted soil sample; Rotating the top cover initially compacts the soil sample and closes the opening of the molding mold. The first loading mechanism and the second loading mechanism are used to compress the soil sample in the molding mold again to obtain a geotechnical sample.

[0014] In one embodiment, the following steps are also included: Remove the second loading mechanism and install a sleeve on the base that mates with the port of the molding die; The first loading mechanism pushes the geotechnical sample to move, pushing the geotechnical sample from the molding mold into the sleeve; Sampling is completed by cutting off the geotechnical sample that extends beyond the sleeve using a cutting blade.

[0015] The above-mentioned triaxial static pressure preparation device for geotechnical specimens and its usage method have at least the following advantages: During the preparation of geotechnical samples, the rotation of the top cover during closing initially compacts the soil sample. After the top cover seals the opening of the molding die, the first and second loading mechanisms apply axial static pressure from both ends of the soil sample. This invention innovatively designs a three-dimensional static pressure method. After circumferential pressure is applied to the soil sample, the axial compaction distance at both ends is shortened. This shortened axial compaction distance at both ends results in more uniform compaction of soil particles, avoiding compaction that is loose inside and dense outside, or dense at both ends and loose in the middle, thus ensuring the accuracy of the test results. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is a schematic diagram of a geotechnical specimen triaxial static pressure preparation device in one embodiment. Figure 2 The figure shows a top view of the geotechnical specimen triaxial static pressure preparation device. Figure 3 for Figure 1 A schematic diagram of a molding die; Figure 4 for Figure 1 The cross-sectional view of the geotechnical specimen triaxial static pressure preparation device is shown. Figure 5 This is a flowchart illustrating the method of using the geotechnical specimen triaxial static pressure preparation device in one embodiment. Figure 6 A schematic diagram of adding soil samples into the molding die; Figure 7 A schematic diagram for initially compacting soil samples by rotating the top cover; Figure 8 This is a schematic diagram of the first and second loading mechanisms compressing the soil sample. Figure 9 A schematic diagram showing the addition of new soil samples to both sides of an existing soil sample; Figure 10 This is a schematic diagram of the initial compaction of the soil sample under the roof. Figure 11 This is a schematic diagram of the first and second loading mechanisms compressing the soil sample. Figure 12 A structural diagram showing the removal of the second loading mechanism on the right. Figure 13 This is a schematic diagram showing the first loading mechanism pressing the geotechnical sample into the sleeve. Figure 14 A schematic diagram for cutting soil samples beyond the sleeve; Figure 15 This is a diagram illustrating the principle of lateral and axial pressure on a soil sample.

[0018] Figure label: 1-Soil sample, 10-Base, 20-Forming mold, 21-Mold body, 212-Opening, 22-Top cover, 23-Segment, 231-Protrusion, 232-Slot, 24-Self-locking structure, 30-Fixing structure, 31-Fixing baffle, 32-Reinforcing baffle, 33-Flange, 34-Pull rod, 35-Butterfly nut, 41-First loading mechanism, 411-Top pressure drive, 412-First pad, 42-Second loading mechanism, 421-Removable baffle, 422-Top pressure rod, 423-Pressure spring, 424-Second pad, 50-Sleeve, 51-Sampling tray, 52-Cutting blade. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the invention; therefore, the invention is not limited to the specific embodiments disclosed below.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0022] According to the requirements for soil sample preparation in geotechnical experiments, the soil sample needs to be uniformly compressed during the sample preparation process, and the particles inside the prepared soil should be evenly distributed to avoid problems such as uneven compression at different ends and uneven particle distribution.

[0023] Currently, the main method for preparing reshaped test specimens is the static compaction method. Static compaction involves using pressure equipment to compact soil material in a mold to form a specimen. To ensure specimen homogeneity, compaction is typically performed from both ends of the mold. However, this method results in density differences between the ends and the middle of the specimen, leading to inhomogeneity and affecting the accuracy of the test results.

[0024] In view of this, in order to solve the above problems, this application provides a triaxial static pressure preparation device for geotechnical samples. The innovative design of the triaxial static pressure method realizes the side extrusion and end extrusion of the soil sample, which can ensure the uniformity of the prepared geotechnical sample.

[0025] To better understand the technical solution and beneficial effects of this application, the following detailed description is provided in conjunction with specific embodiments: Please see Figure 1 and Figure 2 One embodiment of the geotechnical sample triaxial static pressure preparation device includes a base 10, a molding die 20 and a loading mechanism.

[0026] The base 10 is used to support the molding die 20 and the loading mechanism. The molding die 20 is mounted on the base 10 and includes a die body 21 and a top cover 22.

[0027] Please refer to the following: Figure 3The mold body 21 is mounted on the base 10. The mold body 21 has an opening 212 on the side and ports at both ends, so the mold body 21 is generally U-shaped. The top cover 22 is rotatably connected to the mold body 21. During the process of the top cover 22 rotating to close the opening 212, the soil sample 1 inside the molding mold 20 can be initially squeezed. Finally, the top cover 22 closes the opening 212 of the molding mold 20, which facilitates the subsequent squeezing of the two ends of the soil sample 1.

[0028] In one embodiment, the molding die 20 includes multiple segments 23, which are sequentially assembled to form the molding die 20. A fixing structure 30 is used to connect and fix the multiple segments 23 in series. The molding die 20, composed of multiple segments 23, allows for the selection of an appropriate number of segments 23 based on the required sample length, satisfying the preparation needs of different soil samples 1. Simultaneously, the top cover 22 at the corresponding position can be opened as needed to facilitate the placement of the soil sample 1 in the appropriate location and to perform multi-segment compaction of the soil sample 1.

[0029] Please refer to the following: Figure 4 In one embodiment, the fixing structure 30 includes a fixing baffle 31, a reinforcing baffle 32, a flange 33, and a tie rod 34. The fixing baffle 31 is installed on the end of the base 10, and the reinforcing baffle 32 is adjustablely installed on the base 10. The two ends of the tie rod 34 are respectively installed on the fixing baffle 31 and the reinforcing baffle 32. The tie rod 34 connects multiple segments 23 of the forming mold 20 in series. The flange 33 is installed on the tie rod 34 and cooperates with the fixing baffle 31 to clamp and fix the forming mold 20.

[0030] Based on the above embodiments, the base 10 further includes an array of multiple sets of mounting holes, and the reinforcing baffle 32 is installed in the mounting holes by screws. By adjusting the mounting of the reinforcing baffle 32 to correspond to different mounting holes, the position of the reinforcing baffle 32 can be adjusted to accommodate different lengths of the molding die 20, thereby ensuring sufficient support for the tie rod 34.

[0031] Based on the above embodiment, four tie rods 34 are further provided, arranged in two rows and two columns to ensure the stability of the series-connected fixing of the molding mold 20. After passing through the flange 33 and the reinforcing baffle 32, the tie rods 34 are locked and fixed with butterfly nuts 35 to realize the connection between the flange 33 and the tie rods 34, and the connection between the tie rods 34 and the reinforcing baffle 32.

[0032] In one embodiment, when the molding die 20 is formed by splicing multiple segments 23, the segments 23 of the die body 21 are connected by a concave-convex structure, which facilitates the assembly of the die body 21. Specifically, among two adjacent segments 23, one segment 23 is provided with a protrusion 231, and the other adjacent segment is provided with a slot 232. The protrusion 231 is inserted into the slot 232 to realize the assembly connection between the segments 23.

[0033] In one embodiment, the top cover 22 is provided with a self-locking structure 24 that is detachably connected to the mold body 21. This self-locking structure 24 can fix the top cover 22 to the mold body 21, preventing the top cover 22 from separating from the mold body 21 during the compression of the soil in the molding mold 20. Simultaneously, the self-locking structure 24 allows the top cover 22 to be separated from the mold body 21, facilitating the opening of the top cover 22 and the addition of soil sample 1, etc., into the molding mold 20.

[0034] Specifically, the self-locking structure 24 is a cam-link self-locking structure with a removable automatic lock. Of course, in other embodiments, the self-locking structure 24 can also be a latch structure, as long as it can realize the connection between the top cover 22 and the mold body 21, and the separation between the top cover 22 and the mold body 21.

[0035] The loading mechanism includes a first loading mechanism 41 and a second loading mechanism 42 mounted on the base 10. The first loading mechanism 41 and the second loading mechanism 42 are located at opposite ends of the molding mold 20. The first loading mechanism 41 and the second loading mechanism 42 extend into the molding mold 20 from the two ports of the molding mold 20 to compress the soil sample 1 inside the molding mold 20.

[0036] In one embodiment, the first loading mechanism 41 includes a top-pressing drive member 411 and a first pad 412. The top-pressing drive member 411 is adjustablely mounted on the base 10, and the first pad 412 is mounted on the top-pressing drive member 411. The first pad 412 is used to press down on the soil sample 1. Specifically, by extending the top-pressing drive member 411, the first pad 412 moves to the right, thereby compressing the soil sample 1. The top-pressing drive member 411 is adjustablely mounted on the base 10, and its position can be adjusted according to the size of the forming mold 20 and the progress of soil sample 1 compression. This prevents the stroke of the top-pressing drive member 411 from being too long, which could cause vibration during the compression process and result in uneven compaction of the soil sample 1.

[0037] Specifically, the pressure drive component 411 is a hydraulic jack. The piston rod of the hydraulic jack is connected to the first pad 412. The extension of the hydraulic jack piston rod drives the first pad 412 to compress the soil sample 1. The pressure drive component 411 is installed in the mounting hole of the base 10 by screws, thus installing the pressure drive component 411 on the base 10. At the same time, by adjusting different mounting holes, the position of the pressure drive component 411 on the base 10 can be adjusted.

[0038] It is understood that in other embodiments, the top-pressing drive 411 can also be of other structures, as long as it can extend to drive the first pad 412 to press the soil sample 1. For example, the top-pressing drive 411 can also be an electric telescopic rod, etc.

[0039] In one embodiment, the second loading mechanism 42 includes a removable baffle 421, a top pressure rod 422, a pressure spring 423, and a second pad 424. The removable baffle 421 is mounted on the base 10. Specifically, the removable baffle 421 is mounted on the fixed baffle 31, and the removable baffle 421 can be removed later to facilitate subsequent sampling operations.

[0040] The pressure spring 423 is installed on the detachable baffle 421. The pressure spring 423 extends into the molding mold 20 from its port. The pressure spring 423 compresses the soil through the second pad 424, generating a horizontal reaction force equal to that on the left side. Simultaneously, the force exerted by the pressure spring 423 on the soil ensures that the displacement distance is the same when pressure is applied to both sides, thus ensuring uniform compaction of the soil particles at both ends of soil sample 1.

[0041] The top pressure rod 422 is detachably mounted on the detachable baffle 421. When soil needs to be added into the molding mold 20, the position of the second pad 424 needs to be fixed. At this time, the top pressure rod 422 is mounted on the detachable baffle 421, and the top pressure rod 422 presses against the second pad 424 to stabilize its position. After the soil is added into the molding mold 20, the top pressure rod 422 is removed from the detachable baffle 421. At this time, the pressure spring 423 exerts a force on the second pad 424.

[0042] In one embodiment, the removable baffle 421 is provided with a threaded hole, and the pressing rod 422 is provided with a threaded section that mates with the threaded hole. The pressing rod 422 is screwed into the threaded hole, thereby mounting the pressing rod 422 onto the removable baffle 421. At the same time, the distance by which the pressing rod 422 extends out of the molding die 20 can be adjusted by rotating the pressing rod 422.

[0043] Please refer to the following: Figure 5 On the other hand, the present invention also provides a method for using the triaxial static pressure preparation device for geotechnical specimens. To implement this method, the aforementioned triaxial static pressure preparation device for geotechnical specimens is utilized. Specifically, the method includes the following steps: Step S110: Open the top cover 22 of the molding mold 20 and put the soil sample 1 into the molding mold 20.

[0044] Specifically, the top cover 22 of the molding mold 20 is opened, and loose soil particles are added into the molding mold 20 through the open opening 212.

[0045] Step S120: Rotate the top cover 22 to initially compact the soil sample 1, and make the top cover 22 close the opening 212 of the molding mold 20.

[0046] Specifically, the top cover 22 is rotated by external pressure. During the closing process of the top cover 22, a circumferential force is applied, which can initially compact the loose soil sample 1 under the pressure of the top cover 22 and the inner wall of the mold body 21. Then, the top cover 22 and the mold body 21 are connected and fixed by a self-locking structure 24 to prevent the top cover 22 from separating from the mold body 21 during the subsequent compression process.

[0047] Step S130: Insert the first loading mechanism 41 and the second loading mechanism 42 into the molding mold 20 from both ends of the molding mold 20 to compress the soil sample 1 inside the molding mold 20.

[0048] Specifically, the position of the top pressure drive 411 is adjusted so that it can compress the soil sample 1 through the first pad 412. Under the action of the horizontal reaction force, the pressure spring 423 of the second loading mechanism 42 also generates a horizontal force of equal magnitude to the left and applies it to the soil sample 1, so that the soil sample 1 is uniformly loaded. At the same time, the displacement distance at both ends of the soil is the same when it is pressurized, so that the soil particles at both ends of the soil sample 1 can be compacted evenly.

[0049] In one embodiment, to further ensure the uniformity of the prepared geotechnical specimens, the geotechnical specimens are prepared in multiple segments. Specifically, the preparation process includes the following steps: Please refer to the following: Figure 6 Open the top cover 22 of the middle section of the molding mold 20, place roughened pads at both ends of the molding mold 20, and then add soil sample 1 into the molding mold 20.

[0050] Please refer to the following: Figure 7 Next, the top cover 22 is rotated using external pressure. During the locking process of the top cover 22, circumferential pressure is generated, which can initially compact the loose soil sample 1 under the compression of the top cover 22 and the inner wall of the mold body 21. Then, the top cover 22 and the mold body 21 are connected and fixed by a self-locking structure 24 to prevent the top cover 22 from separating from the mold body 21 during the subsequent compression process.

[0051] Please refer to the following: Figure 8 Then, the position of the top pressure drive 411 is adjusted so that it can uniformly load the first pad 412. Under the action of the horizontal reaction force, the pressure spring 423 of the second loading mechanism 42 also generates a horizontal force of equal magnitude to the left and applies it to the soil sample 1, so that the soil sample 1 is uniformly loaded and the soil sample 1 has a uniform and dense particle distribution.

[0052] Please refer to the following: Figure 9 Next, open all the top covers 22 of the molding mold 20, and add new soil samples 1 to both sides of the already prepared soil sample 1. For example... Figure 10As shown, the top cover 22 is rotated by external pressure. During the closing process of the top cover 22, the loose soil sample 1 can be initially compacted by the squeezing of the top cover 22 and the inner wall of the mold body 21.

[0053] Please refer to the following: Figure 11 Next, the position of the top pressure drive 411 is adjusted to apply radial pressure to the multiple soil samples 1. Due to the roughening treatment of the soil samples 1, the multiple soil samples can be completely squeezed and compacted into a long, complete soil sample 1. Furthermore, the middle and ends of the geotechnical sample are prepared by static pressure, which can ensure the uniformity of the entire geotechnical sample and avoid the situation where the ends of the geotechnical sample are dense and the middle is loose.

[0054] In this embodiment, such as Figure 12 As shown, the distance that the two ends of soil sample 1 need to be axially compacted can be calculated using the following formula.

[0055] The above calculation process shows that after circumferential pressure is applied, the required axial compaction distance at both ends of soil sample 1 is shortened. The shortened compaction distance allows for more uniform compaction of soil particles.

[0056] Please see Figures 13 to 15 In one embodiment, after the geotechnical sample is prepared, it needs to be separated and removed. The specific sampling method for the geotechnical sample is as follows: The second loading mechanism 42 is removed, and a sleeve 50 that mates with the port of the molding mold 20 is installed on the base 10. The first loading mechanism 41 pushes the geotechnical sample, pushing it from the molding mold 20 into the sleeve 50. The portion of the geotechnical sample extending beyond the sleeve 50 is cut off by the cutting blade 52, completing the sampling.

[0057] Specifically, the above process is as follows: the detachable baffle 421 of the second loading mechanism 42 is removed, along with the pressure spring 423 and the second pad 424, to expose the right side port of the molding mold 20. Then, the sampling tray 51 is spliced ​​on the base 10, and then the sleeve 50 is installed on the sampling tray 51. The sleeve 50 is aligned with the port of the molding mold 20, and the inner diameter of the sleeve 50 is the same as the inner diameter of the molding mold 20, so that the geotechnical sample can slide into the sleeve 50.

[0058] Then, the top pressure drive 411 of the first loading mechanism 41 pushes the soil sample to move. When the stroke of the top pressure drive 411 is insufficient, the distance is increased by adding the first pad 412 until the soil sample is pushed into the sleeve 50 and the right side of the soil sample is flush with the right end face of the sleeve 50.

[0059] Finally, the soil extending beyond the sleeve 50 is removed by cutting blade 52, completing the sampling process.

[0060] The aforementioned triaxial static compaction device and its method for preparing geotechnical samples innovatively employ a triaxial static compaction approach. After circumferential pressurization, the axial compaction distance at both ends of soil sample 1 is shortened. This shortened axial compaction distance allows for more uniform compaction of soil particles, avoiding situations where the soil is loose inside and dense outside, or dense at both ends and loose in the middle, thus ensuring the accuracy of the test results. Simultaneously, the geotechnical sample is formed by separate static compaction in multiple segments, which shortens the axial pressurization distance, increases the compaction density and uniformity of the soil, and further guarantees the accuracy of the test results.

[0061] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A geotechnical specimen triaxial static pressure preparation device, characterized in that, include: Base; A molding die, mounted on the base, includes a die body and a top cover. The die body has an opening on the side and ports at both ends. The top cover is rotatably connected to the die body and is used to close the opening and initially compress the soil sample inside the molding die. The loading mechanism includes a first loading mechanism and a second loading mechanism disposed on the base. The first loading mechanism and the second loading mechanism are located at opposite ends of the molding mold. The first loading mechanism and the second loading mechanism extend into the molding mold from two ports of the molding mold to compress the soil sample inside the molding mold.

2. The geotechnical specimen triaxial static pressure preparation device according to claim 1, characterized in that, It also includes a fixing structure. The molding die includes multiple segments, which are assembled sequentially to form the molding die. The fixing structure is used to fix the multiple segments in series.

3. The geotechnical specimen triaxial static pressure preparation device according to claim 2, characterized in that, The fixing structure includes a fixing baffle, a reinforcing baffle, a flange, and a tie rod. The fixing baffle and the reinforcing baffle are installed on the base. The two ends of the tie rod are respectively installed on the fixing baffle and the reinforcing baffle. The tie rod connects multiple segments in series. The flange is installed on the tie rod and cooperates with the fixing baffle to clamp and fix the forming mold.

4. The geotechnical specimen triaxial static pressure preparation device according to claim 1, characterized in that, The top cover is provided with a self-locking structure that can be detachably connected to the mold body.

5. The geotechnical specimen triaxial static pressure preparation device according to claim 1, characterized in that, The first loading mechanism includes a top pressure drive and a first pad. The top pressure drive is adjustablely mounted on the base, and the top pressure drive compresses the soil through the first pad.

6. The geotechnical specimen triaxial static pressure preparation device according to claim 1, characterized in that, The second loading mechanism includes a detachable baffle, a top pressure rod, a pressure spring, and a second pad. The detachable baffle is mounted on the base, and the pressure spring is mounted on the detachable baffle. The pressure spring compresses the soil through the second pad. The top pressure rod is detachably mounted on the detachable baffle and has a first state of being mounted on the detachable baffle and pressing against the second pad, and a second state of being removed from the detachable baffle.

7. The geotechnical specimen triaxial static pressure preparation device according to claim 6, characterized in that, The detachable baffle is provided with a threaded hole, and the top pressure rod is provided with a threaded section that mates with the threaded hole.

8. A method for using a triaxial static pressure preparation device for geotechnical specimens, characterized in that, The method of using the geotechnical specimen triaxial static pressure preparation device as described in any one of claims 1-7 includes the following steps: Open the top cover of the molding mold and put the soil sample into the molding mold; Rotating the top cover initially compacts the soil sample and closes the opening of the molding mold. The first and second loading mechanisms are inserted into the molding mold from both ends to compress the soil sample inside the molding mold.

9. The method of using the triaxial static pressure preparation device for geotechnical specimens according to claim 8, characterized in that, The specific usage method is as follows: Open the top cover in the middle of the molding mold and put the soil sample into the molding mold; Rotating the top cover initially compacts the soil sample and closes the opening of the molding mold. The first loading mechanism and the second loading mechanism are inserted into the molding mold from both ends to compress the soil sample inside the molding mold. Open all the top covers of the molding mold and add new soil samples to both sides of the already compacted soil sample; Rotating the top cover initially compacts the soil sample and closes the opening of the molding mold. The first loading mechanism and the second loading mechanism are used to compress the soil sample in the molding mold again to obtain a geotechnical sample.

10. The method of using the triaxial static pressure preparation device for geotechnical specimens according to claim 8, characterized in that, It also includes the following steps: Remove the second loading mechanism and install a sleeve on the base that mates with the port of the molding die; The first loading mechanism pushes the geotechnical sample to move, pushing the geotechnical sample from the molding mold into the sleeve; Sampling is completed by cutting off the geotechnical sample that extends beyond the sleeve using a cutting blade.

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