Soil engineering triaxial shear test sample preparation device and test equipment

Abstract

The utility model relates to the technical field of geotechnical test triaxial sample preparation, in particular to a geotechnical triaxial shear test sample preparation device and test equipment, which comprises a bottom plate, a die sleeve component and a stand column are arranged on the bottom plate, and a thickness adjusting beam and a pressure beam are sequentially and movably arranged on the stand column above the die sleeve component; a compaction column is arranged on the thickness adjusting cross beam, and the inclination angle of the bottom surface of the compaction column is equal to that of the inclined layer to be manufactured; and a pressure applying assembly is arranged on the pressure cross beam. During use, only the thickness of each layer needs to be calculated, the compaction column with the corresponding inclination angle is selected, the height of the thickness adjusting cross beam is adjusted, the layer thickness of the sample is just equal to the thickness of the needed sample layer when the pressure applying assembly presses the compaction columns to the upper surface of the thickness adjusting cross beam, and control over the thickness and the angle of the sample is achieved. The problem that a traditional triaxial sample preparation device cannot meet the sample preparation accuracy of the rock slope containing the argillization weak intercalated layer is solved.

Description

Technical Field

[0001] This utility model relates to the field of triaxial sample preparation technology for geotechnical testing, specifically to a sample preparation device and testing equipment for triaxial shear testing of geotechnical materials. Background Technology

[0002] A rock slope containing argillaceous weak interlayers refers to a slope structure in which the rock composition contains argillaceous weak interlayers. These argillaceous weak interlayers are formed under geological processes such as weathering and tectonic disruption, where the original structure undergoes significant changes. These processes, including rock strata fracturing and structural alteration, provide channels for groundwater seepage. Groundwater plays a crucial role in the formation of argillaceous weak interlayers; long-term water flow promotes the argillaceization and softening of the rock, thus forming these interlayers. Primitive argillaceous weak interlayers typically occur under conditions where the upper and lower rock strata are relatively hard, while the middle is relatively soft. Arylized weak interlayers are often characterized by high water content, low strength, and easy deformation. Therefore, even though the rock itself is relatively hard, the presence of argillaceous weak interlayers significantly reduces the overall stability of the slope. Under seismic loading, argillaceous weak interlayers follow the cumulative strain development law and exhibit destructive development characteristics. When argillaceous interlayers are present in the rock mass, their various physical and mechanical properties become the controlling factors of the slope's dynamic response. Rock slopes with thinner argillaceous interlayers and those with thicker argillaceous interlayers exhibit different failure modes, with the latter being more prone to failure. Rock slopes with weak argillaceous interlayers are frequently encountered in engineering projects, such as bridges, dams, and slope construction. In practice, detailed geological surveys are typically conducted on rock slopes with weak argillaceous interlayers to understand the distribution, thickness, and physical and mechanical properties of the interlayers. Based on the geological survey results, appropriate reinforcement measures, such as grouting and anchor bolt reinforcement, are then implemented to ensure the safety and stability of the project. Therefore, measuring the deformation, strength, and other mechanical properties of rock slopes with weak argillaceous interlayers is crucial.

[0003] Traditional triaxial sample preparation apparatus includes a hammer, a compaction cylinder, and a casing. During sample preparation, soil is repeatedly placed into the compaction cylinder and compacted with the hammer until the soil thickness reaches the edge of the cylinder. The casing is then fitted, and soil is added and compacted again to complete the sample preparation. This apparatus cannot accommodate adjustments to the thickness and inclination angle of the clayey weak layer, thus failing to provide similar sample preparation for rock slopes containing clayey weak interlayers. Therefore, the strength and modulus measured using traditional triaxial testing methods will differ from the true values, leading to increased engineering costs and poor economic efficiency. Furthermore, traditional methods for preparing remolded soil samples for triaxial testing (see national standard GB / T 50123-1999) cannot accurately control the compaction thickness of each layer, especially for clayey weak interlayers, resulting in remolded soil samples with poor homogeneity and low efficiency.

[0004] Therefore, traditional triaxial sample preparation equipment is only suitable for the preparation of normal triaxial samples and cannot meet the requirements for the preparation of remolded soil samples containing clay-like weak layers. Utility Model Content

[0005] To address the problem that existing traditional triaxial sample preparation devices cannot adjust the thickness and inclination angle of the clay-bearing weak layer, thus failing to meet the accuracy requirements for sample preparation on rock slopes containing clay-bearing weak interlayers, this invention provides a geotechnical triaxial shear test sample preparation device and testing equipment.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This invention provides a geotechnical triaxial shear test specimen preparation device, comprising a base plate, a mold assembly on the base plate, a specimen inside the mold assembly, columns fixed on both sides of the base plate of the mold assembly, and a thickness adjustment beam and a pressure beam sequentially arranged above the mold assembly; both the pressure beam and the thickness adjustment beam are connected to the columns, and both can move along the axial direction of the columns; a compaction column is arranged on the thickness adjustment beam, extending through the thickness adjustment beam into the inner cavity of the mold assembly, the bottom surface of the compaction column being a sloping bottom surface with a slope angle equal to the slope angle of the muddy weak layer; a pressure application component is arranged on the pressure beam above the compaction column for applying pressure to the compaction column and compacting the specimen.

[0008] Optionally, the mold assembly includes a mold, an elevating mold, and a large mold, wherein the elevating mold is detachably connected to the top of the mold; and the large mold is fitted over the outside of the mold during sample removal.

[0009] Optionally, a level is provided on the thickness adjustment beams on both sides of the compaction column.

[0010] Optionally, the compacted column includes a top cap and an angle transformer, the top cap and the angle transformer being detachably connected, and the angle transformer being a column with a sloping bottom surface, the slope angle of the sloping bottom surface being equal to the slope angle of the muddy soft layer.

[0011] Optionally, a threaded guide post is provided on the side of the top cap that connects to the angle converter; a threaded hole that mates with the threaded guide post is provided on the side of the angle converter that connects to the top cap.

[0012] Optionally, the thickness adjustment beam has a support hole, and the thickness adjustment beam has a groove along the circumference of the support hole. A support plate is provided in the groove, and a compaction column mounting hole is provided on the support plate. The compaction column extends through the compaction column mounting hole into the mold assembly.

[0013] Optionally, the pressure application assembly includes a jack mounted on a pressure beam, the power output end of the jack passing through the pressure beam and contacting the top of the compaction column, and the jack being connected to a hydraulic pump for driving the jack.

[0014] Optionally, the outer wall of the column is provided with threads, the pressure beam and the thickness adjustment beam are both sleeved on the column, and nuts matching the threads on the outer wall of the column are provided on both sides of the pressure beam and the thickness adjustment beam.

[0015] Optionally, a plurality of positioning holes are provided on the column below the thickness adjustment beam, and a screw is provided in the positioning hole for limiting the thickness adjustment beam.

[0016] A geotechnical testing device, comprising the above-mentioned geotechnical triaxial shear test specimen preparation device.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This invention relates to a geotechnical triaxial shear test specimen preparation device. A mold assembly is installed on a base plate to hold the specimen. Columns are installed on both sides of the base plate on the mold assembly, and adjustable thickness adjustment beams and pressure beams are mounted on these columns. A compaction column is installed on the thickness adjustment beam. The height of the thickness adjustment beam can be adjusted to control the specimen thickness. The bottom surface of the compaction column is set as a slope, and the slope angle of the slope is equal to the inclination angle of the clay-like weak layer, thus adjusting the specimen inclination angle. In practical application, the thickness of each layer is calculated, and the height of the thickness adjustment beam is adjusted according to the specimen layer thickness. When the pressure application component on the pressure beam presses the compaction column onto the upper surface of the thickness adjustment beam, the specimen layer thickness is exactly equal to the required specimen layer thickness, achieving thickness control. Furthermore, during specimen compaction, a compaction column with a corresponding inclination angle can be selected according to the specimen's inclination angle, allowing for specimen angle adjustment to meet the requirements for preparing clay-like weak layers. The device has a simple structure and can produce triaxial shear specimens of weak layers with different angles and thicknesses. It is also easy to operate and can be used to study the physical and mechanical properties of rock masses containing weak interlayers.

[0019] The mold assembly includes a mold, an ascending mold, and a large mold. The ascending mold is detachably connected to the top of the mold. When unloading the sample, the large mold is placed outside the mold. During the sample compaction process, the addition of the ascending mold can prevent uncompacted soil from overflowing during backfilling, and the large mold can assist in unloading the sample.

[0020] The thickness adjustment beams on both sides of the compaction column are equipped with levels to ensure that the thickness adjustment beams remain horizontal after the height of the beams is adjusted, thereby ensuring the stability of the tilt angle of the compacted sample and ensuring the similarity of the sample preparation.

[0021] The compaction column includes a top cap and an angle converter. The top cap and the angle converter are detachably connected. The angle converter is a column with a sloping bottom surface. The slope angle of the sloping bottom surface is equal to the slope angle of the muddy soft layer. By setting the top cap and the angle converter to be detachably connected, the preparation of samples with the required slope angle is made possible, thus improving the versatility of the device.

[0022] The top cap is provided with a threaded guide post on the side where it connects to the angle converter; the angle converter is provided with a threaded hole on the side where it connects to the top cap, which is engaged with the threaded guide post. This engagement connection method enables quick replacement of the angle converter, and the structure is simple and the processing cost is low.

[0023] The thickness adjustment beam has support holes, and a groove is provided around the support holes on the thickness adjustment beam. A support plate is provided in the groove, and a compaction column mounting hole is provided on the support plate. The compaction column extends through the compaction column mounting hole into the mold sleeve assembly. By setting the support plate, groove, and support holes, the support plate can be set to have multiple types of compaction column mounting holes. In practical application, the preparation of triaxial samples of different types can be achieved by replacing the support plate and mold sleeve assembly corresponding to the corresponding compaction column. The operation is simple and has good versatility.

[0024] The pressure application assembly includes a jack mounted on a pressure beam. The power output end of the jack passes through the pressure beam and contacts the top of the compaction column. The jack is connected to a hydraulic pump, which drives the jack. By using a hydraulic pump to drive the jack to apply pressure to the compaction column, the sample is compacted. Compared to the traditional hammer compaction method, the prepared sample has more uniform properties and is more efficient.

[0025] The pressure beam and thickness adjustment beam are fixed by setting threads on the outer wall of the column and by setting nuts that mate with the threads on both sides of the pressure beam and thickness adjustment beam.

[0026] A plurality of positioning holes are provided on the column below the thickness adjustment beam, and screws are installed in the positioning holes to limit the thickness adjustment beam. The positions of the positioning holes can be the standard positions of the thickness adjustment beam when preparing standard triaxial specimens, providing a limit for the preparation of standard triaxial specimens. Therefore, when preparing standard triaxial specimens, the thickness adjustment beam can be directly adjusted to the position defined by the corresponding positioning holes without the need for measurement and subsequent adjustment, thus improving the efficiency of standard triaxial specimen preparation.

[0027] This invention also provides a geotechnical testing device, including the aforementioned geotechnical triaxial shear test specimen preparation apparatus. This testing device can meet the research needs for the physical and mechanical properties of different rock masses containing weak interlayers, and the simulation results are more accurate, ensuring the safety and feasibility of subsequent construction. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a geotechnical triaxial shear test specimen preparation device according to the present invention.

[0029] Figure 2 This is a partial structural diagram of a geotechnical triaxial shear test specimen preparation device according to the present invention.

[0030] Figure 3 This is a structural diagram showing the disassembled formwork assembly in a geotechnical triaxial shear test specimen preparation device according to the present invention.

[0031] Figure 4 This is a top view of the thickness adjustment beam structure in a geotechnical triaxial shear test specimen preparation device according to the present invention.

[0032] Figure 5 This is a structural diagram of the support plate in a geotechnical triaxial shear test specimen preparation device according to the present invention.

[0033] Figure 6 This invention provides a structural diagram of a compaction column in a geotechnical triaxial shear test specimen preparation device, as well as structural diagrams of various slope bottom angle converters. In the diagram, a is the compaction column structure, and b is a schematic diagram of the top cap and various matching slope bottom angle converters.

[0034] Figure 7 This is a top view of the pressure beam in a geotechnical triaxial shear test specimen preparation device according to the present invention.

[0035] Among them, 1-base plate, 2-column, 3-pressure beam, 4-thickness adjustment beam, 41-support hole, 42-groove, 43-support plate, 44-compactor mounting hole, 5-mold assembly, 51-mold, 52-increasing mold, 53-large mold, 54-mold base, 6-compactor, 61-top cap, 62-angle converter, 63-threaded guide post, 7-level, 8-nut, 9-positioning hole, 10-jack, 11-hydraulic pump, 12-positioning groove. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0041] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] The present invention will be further described in detail below with reference to specific embodiments. The description is for explanation and not limitation of the present invention.

[0043] This utility model discloses a geotechnical triaxial shear test specimen preparation device, referring to... Figure 1 and Figure 2 It includes a base plate 1 and a mold assembly 5, wherein the base plate 1 is provided with a positioning groove 12.

[0044] See Figure 3 The mold sleeve assembly 5 is disposed within the positioning groove 12 and includes a mold sleeve 51, an elevating mold sleeve 52, a large mold sleeve 53, and a mold sleeve base 54. The elevating mold sleeve 52 is detachably connected to the top of the mold sleeve 51. When unloading the sample, the large mold sleeve 53 is fitted over the outside of the mold sleeve 51. The mold sleeve base 54 is located below the mold sleeve 52 and is disposed within the positioning groove 12. The positioning groove 12 can achieve rapid positioning of the mold sleeve assembly 5 and ensure the stability of the mold sleeve assembly 5 during sample compaction. The sample is placed inside the mold sleeve 52.

[0045] See Figure 1 and Figure 2 The mold assembly 5 has columns 2 fixed on the base plates 1 on both sides. The outer wall of the column 2 is threaded. The upper column 2 of the mold assembly 5 is provided with a thickness adjustment beam 4 and a pressure beam 3. The pressure beam 3 and the thickness adjustment beam 4 are both sleeved on the column 2. The column 2 on both sides of the pressure beam 3 and the thickness adjustment beam 4 is provided with nuts 8 that match the threads on the outer wall of the column 2. After the pressure beam 3 and the thickness adjustment beam 4 are adjusted into place, they are fixed by the nuts 8 on both sides. The column 2 below the thickness adjustment beam 4 is provided with a number of positioning holes 9. The positioning holes 9 are provided with screws for limiting the thickness adjustment beam 4.

[0046] See Figure 4 and Figure 5 The thickness adjustment beam 4 is provided with a support hole 41, and a groove 42 is provided on the thickness adjustment beam 4 along the circumference of the support hole 41. A support plate 43 is provided in the groove 42, and a compaction column mounting hole 44 is provided on the support plate 43. A compaction column 6 is inserted into the compaction column mounting hole 44, and the bottom surface of the compaction column 6 is at the same angle as the required inclined layer. The compaction column 6 extends through the compaction column mounting hole 44 into the mold sleeve assembly 5. To accommodate the installation of various models of mold sleeve assemblies 5 and compaction columns, the diameter of the support hole 41 is larger than the diameter of the compaction column mounting hole 44 and smaller than the diameter of the support plate 43. Multiple support plates 43 can be provided, and in use, only the mold sleeve assembly 5, the compaction column 6, and the support plate 43 need to be replaced.

[0047] See Figure 6The compaction column 6 includes a top cap 61 and an angle converter 62. The top cap 61 and the angle converter 62 are detachably connected. The angle converter 62 is a column with a sloping bottom surface, and the slope angle of the sloping bottom surface is equal to the slope angle of the muddy soft layer. Optionally, a threaded guide post 63 is provided on the side where the top cap 61 connects to the angle converter 62; a threaded hole that mates with the threaded guide post 63 is provided on the side where the angle converter 62 connects to the top cap 61. A level 7 is provided on the thickness adjustment beam 4 to ensure that the thickness adjustment beam 4 is in a horizontal position.

[0048] See Figures 1 to 7 The pressure beam 3 is equipped with a pressure application component for applying pressure to the compaction column 6 to compact the sample. The pressure application component includes a jack 10 mounted on the pressure beam 3. The power output end of the jack 10 passes through the pressure beam 3 and contacts the top of the compaction column 6. The jack 10 is connected to a hydraulic pump 11, which is used to drive the jack 10.

[0049] Taking a geotechnical triaxial shear test specimen preparation device as an example. In the device, the base plate 1 has a side length of 200mm and a thickness of 20mm; the column 2 has a diameter of 20mm; each column 2 has 5 positioning holes 9 sequentially opened along the axial direction, the distance between adjacent positioning holes 9 is 16mm, and the distance from the lowest positioning hole 9 to the base plate 1 is 104mm; the support hole 41 has a diameter of 80mm, and the groove 42 has a diameter of 100mm and a depth of 5mm; the pressure beam 3 is a plate with a length of 200mm, a width of 150mm, and a thickness of 20mm; the thickness adjustment beam 4 is a plate with a length of 200mm, a width of 150mm, and a thickness of 10mm. The support plate has a thickness of 5mm and an outer diameter of 100mm; the mold base 54 is a cylinder with a diameter of 71.1mm and a height of 20mm, and a cylindrical groove with a diameter of 55.1mm and a depth of 10mm is drilled in the top of the mold base 54; the mold 51 is an annulus with an outer diameter of 55.1mm, an inner diameter of 39.1mm, and a height of 85mm; the heightening mold 52 is an annulus with an outer diameter of 55.1mm, an inner diameter of 39.1mm, and a height of 32mm; the large mold 53 is an annulus with an outer diameter of 62mm, an inner diameter of 42mm, and a height of 90mm.

[0050] The steps for preparing a normal triaxial specimen with a diameter of 39.1 mm and a height of 80 mm are as follows:

[0051] Calculate the total mass of the triaxial specimen and one-fifth of the total mass;

[0052] The mold base 54 is placed in the positioning groove 12 of the base plate 1, and then the mold 51 is placed in the mold base 54. One-fifth of the total mass of the triaxial sample is weighed and poured into the mold 51.

[0053] Adjust the thickness adjustment beam 4 to the position of the lowest positioning hole 9, fix it with screws, then place the support plate 43 in the groove 42 of the thickness adjustment beam 4, and then extend the compaction column 6 through the support plate 43 into the mold sleeve 51.

[0054] Adjust the pressure beam 3 to a suitable height, and press the hydraulic pump 11 to lower the jack 10 to compact the sample.

[0055] Operate the hydraulic pump 11 to relieve the force of the jack 10, adjust the pressure beam 3 and the thickness adjustment beam 4 upwards, remove the compaction column 6, and then roughen the compacted sample.

[0056] Repeat the process of making 2 to 5 layers of the sample. Before pouring the material into the mold 51 for the fourth time, place the heightening mold 52 on the mold 51.

[0057] After the sample is made, adjust the thickness adjustment beam 4 to contact the base plate 1, then place the compaction column 6 upside down in the support plate 43, then place the mold sleeve 51 containing the sample upside down to contact the top of the compaction column 6, then place the large mold sleeve 53 upright to contact the top of the mold sleeve 51, then place the mold sleeve base 54 upside down to contact the top of the large mold sleeve 53, finally adjust the height of the pressure beam 3, press the hydraulic pump 11 to make the jack 10 descend and press down the mold sleeve 51, the large mold sleeve 53, and the mold sleeve base 54, and take out the made triaxial sample into the large mold sleeve 53;

[0058] Operate the hydraulic pump 11 to relieve the force of the jack 10, adjust the pressure beam 3 upward, and remove the mold base 54 and the large mold 53 to obtain the triaxial sample.

[0059] The steps for fabricating a triaxial specimen with a diameter of 39.1 mm and a height of 80 mm, including the dip angle of the weak layer, are as follows:

[0060] Calculate the required mass of one-fifth of the sample, the mass of the second and fourth layers of the sample, and the mass and thickness of the weak layer;

[0061] The mold base 54 is placed in the groove 42 of the base plate 1, and then the mold 51 is placed in the mold base 54. One-fifth of the total mass of the triaxial sample is weighed and poured into the mold 51.

[0062] Adjust the thickness adjustment beam 4 to the position of the lowest positioning hole 9 and fix it with screws. Then place the support plate 43 with an inner diameter of 39.1mm in the groove 42 of the thickness adjustment beam 4. Then put the compaction column 6 through the support plate 43 and the thickness adjustment beam 4 into the mold sleeve 51.

[0063] Adjust the pressure beam 3 to a suitable height, and press the hydraulic pump 11 to lower the jack 10 to compact the sample.

[0064] Operate the hydraulic pump 11 to relieve the force of the jack 10, adjust the pressure beam 3 and the thickness adjustment beam 4 upwards, lower the compaction column 6, and then roughen the compacted sample.

[0065] An angle converter 62 with the required angle is assembled with a threaded guide post 63 and a top cap 61 to form a compactor with the required angle.

[0066] Weigh the second layer of material of the sample and pour it into the mold 51. Adjust the thickness adjustment beam 4 upward to the position of the positioning hole 9 and fix it with a screw. Then, put the assembled compaction column into the mold 51 after passing through the support plate 43 and the thickness adjustment beam 4.

[0067] Repeat the sample; weigh the mass of the weak layer material of the sample and pour it into the mold 51. Adjust the thickness adjustment beam 4 upward to a certain height, which is the height of the weak layer thickness. Fix it with nut 8. Then, put the assembled compaction column into the mold 51 after passing through the support plate 43 and the thickness adjustment beam 4.

[0068] Weigh the material of the fourth layer of the sample and pour it into the mold 51. Adjust the thickness adjustment beam 4 upward to the position of the fourth positioning hole 9 and fix it with a screw. Then, put the compaction column 6 into the mold 51 after passing through the support plate 43 and the thickness adjustment beam 4.

[0069] Weigh one-fifth of the mass of the prepared sample and pour it into the mold sleeve 51. Adjust the thickness adjustment beam 4 upward to the position of the fifth positioning hole 9 and fix it with a screw. Then, put the compaction column 6 into the mold sleeve 51 after passing through the support plate 43 and the thickness adjustment beam 4.

[0070] Repeatedly adjust the height;

[0071] After the sample is made, adjust the thickness adjustment beam 4 to contact the base plate 1, then place the compaction column 6 upside down inside the support plate 43, then place the mold sleeve 51 containing the sample upside down to contact the top of the compaction column 6, then place the large mold sleeve 53 upright to contact the top of the mold sleeve 51, then place the mold sleeve base 54 upside down to contact the top of the large mold sleeve 53, finally adjust the height of the pressure beam 3, press the hydraulic pump 11 to make the jack 10 descend and press down the mold sleeve 51, the large mold sleeve 53, and the mold sleeve base 54, and take out the made triaxial sample into the large mold sleeve.

[0072] Operate the hydraulic pump 11 to relieve the force of the jack 10, adjust the pressure beam 3 upward, remove the lower mold base 54 and the large mold 53, and obtain the triaxial sample.

[0073] This invention also provides a geotechnical testing device, including the aforementioned geotechnical triaxial shear test specimen preparation apparatus. This testing device can meet the research needs for the physical and mechanical properties of different rock masses containing weak interlayers, and the simulation results are more accurate, ensuring the safety and feasibility of subsequent construction.

[0074] In summary, this invention provides a geotechnical triaxial shear test specimen preparation device and testing equipment. When using this device, only the thickness of each layer needs to be calculated. The height of the thickness adjustment beam 4 is adjusted according to the thickness of the specimen layer. When the pressure application component on the pressure beam 3 presses the compaction column 6 onto the upper surface of the thickness adjustment beam 4, the specimen layer thickness is exactly equal to the required specimen layer thickness, thus achieving thickness control. Furthermore, during specimen compaction, the compaction column 6 with the corresponding inclination angle can be selected according to the specimen's inclination angle, allowing for angle adjustment of the specimen and meeting the requirements for preparing samples from muddy weak layers. This device has a simple structure, can prepare triaxial shear specimens of weak layers with different angles and thicknesses, and is easy to operate. It can be used to study the physical and mechanical properties of rock masses containing weak interlayers.

[0075] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the technical solution of the present utility model in any way. Those skilled in the art should understand that, without departing from the spirit and principles of the present utility model, the technical solution can be modified and replaced in several simple ways, and these modifications and replacements are all within the scope of protection covered by the claims.

Claims

1. A geotechnical triaxial shear test specimen preparation device, characterized in that, The system includes a base plate (1), on which a mold assembly (5) is provided. The sample is placed inside the mold assembly (5). Columns (2) are fixed on the base plate (1) on both sides of the mold assembly (5). A thickness adjustment beam (4) and a pressure beam (3) are arranged sequentially above the mold assembly (5). Both the pressure beam (3) and the thickness adjustment beam (4) are connected to the column (2), and both the pressure beam (3) and the thickness adjustment beam (4) can move along the axial direction of the column (2). A compaction column (6) is provided on the thickness adjustment beam (4). The compaction column (6) extends through the thickness adjustment beam (4) into the inner cavity of the mold assembly (5). The bottom surface of the compaction column (6) is a sloping bottom surface, and the slope angle of the sloping bottom surface is equal to the slope angle of the muddy soft layer. A pressure application component is provided on the pressure beam (3) above the compaction column (6) to apply pressure to the compaction column (6) and compact the sample.

2. The geotechnical triaxial shear test specimen preparation device according to claim 1, characterized in that, The mold assembly (5) includes a mold (51), an elevating mold (52) and a large mold (53). The elevating mold (52) is detachably connected to the top of the mold (51). When unloading the sample, the large mold (53) is fitted over the outside of the mold (51).

3. The geotechnical triaxial shear test specimen preparation device according to claim 1, characterized in that, A level (7) is installed on the thickness adjustment beams (4) on both sides of the compaction column (6).

4. The geotechnical triaxial shear test specimen preparation device according to claim 1, characterized in that, The compaction column (6) includes a top cap (61) and an angle converter (62). The top cap (61) and the angle converter (62) are detachably connected. The angle converter (62) is a column with a sloping bottom surface. The slope angle of the sloping bottom surface is equal to the slope angle of the muddy soft layer.

5. The geotechnical triaxial shear test specimen preparation device according to claim 4, characterized in that, A threaded guide post (63) is provided on the side where the top cap (61) is connected to the angle converter (62); a threaded hole that mates with the threaded guide post (63) is provided on the side where the angle converter (62) is connected to the top cap (61).

6. The geotechnical triaxial shear test specimen preparation device according to claim 1, characterized in that, The thickness adjustment beam (4) has a support hole (41) and a groove (42) is provided on the thickness adjustment beam (4) along the circumference of the support hole (41). A support plate (43) is provided in the groove (42) and a compaction column mounting hole (44) is provided on the support plate (43). The compaction column (6) extends through the compaction column mounting hole (44) into the mold assembly (5).

7. The geotechnical triaxial shear test specimen preparation device according to claim 1, characterized in that, The pressure application assembly includes a jack (10) mounted on a pressure beam (3). The power output end of the jack (10) passes through the pressure beam (3) and contacts the top of the compaction column (6). The jack (10) is connected to a hydraulic pump (11), which is used to drive the jack (10).

8. The geotechnical triaxial shear test specimen preparation device according to claim 1, characterized in that, The outer wall of the column (2) is provided with threads, the pressure beam (3) and the thickness adjustment beam (4) are both sleeved on the column (2), and nuts (8) matching the threads on the outer wall of the column (2) are provided on both sides of the pressure beam (3) and the thickness adjustment beam (4).

9. The geotechnical triaxial shear test specimen preparation device according to claim 1, characterized in that, The column (2) below the thickness adjustment beam (4) is provided with several positioning holes (9), and a screw is provided in the positioning hole (9) for limiting the thickness adjustment beam (4).

10. A geotechnical testing device, characterized in that, Includes the geotechnical triaxial shear test specimen preparation apparatus as described in any one of claims 1-9.

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