Triaxial test sample preparation device suitable for calcareous sand

Abstract

The utility model provides a triaxial test sample preparation device suitable for calcareous sand, and belongs to the technical field of geotechnical engineering experiments. The device comprises a mounting seat, a sample preparation mold, a feeding mechanism and a vibrating mechanism. The mounting seat comprises a bottom plate and a bracket arranged on the bottom plate; the sample preparation mold comprises a sample preparation barrel and a base, the base is arranged on the bottom plate, the axis of the sample preparation barrel is perpendicular to the bottom plate, and one end of the sample preparation barrel is detachably connected to the base; the putting mechanism comprises a putting funnel; the putting funnel is connected with the bracket and is arranged above the sample preparation barrel; the vibrating mechanism is arranged on the bottom plate and comprises a motor, a transmission mechanism and a knocking ring, the knocking ring sleeves the outer side of the sample preparation barrel, a knocking block is arranged on the inner ring of the knocking ring, and the motor is in transmission connection with the knocking ring through the transmission mechanism. By adopting the triaxial test sample preparation device, the technical problem that a prepared sample is easy to deform and collapse due to the defects of a compaction mode in the prior art can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical engineering experiments, in particular to a triaxial test sample preparation device suitable for calcareous sand. Background Art

[0002] The triaxial test is a common method for measuring the mechanical properties of soil. It is often used for sand and rock materials. Sample preparation is required before the experiment.

[0003] In the related art, indoor triaxial specimens are made by controlling the density of the specimens, using layered batching, layered filling, and layered compaction methods. For example, the sample preparation device for geotechnical triaxial testing disclosed in publication number CN218496547U uses a drop hammer to compact the specimen, and uses a triaxial test sample preparation device and a triaxial test machine axial loading platform to compact the soil sample in the sample preparation tube to prepare the specimen.

[0004] As a non-continuous soil medium, calcareous sand has been widely used in the field of geotechnical engineering. It is often used in the construction of marine platforms, docks, embankments and marine structures such as reclamation of islands and reefs in the South China Sea. The strength of calcareous sand is low, and it is easy to produce particle breakage when it is subjected to large loads. The fine particles produced by particle breakage fill the pores of calcareous sand, increasing the contact between particles while changing the pore structure of the soil, resulting in a decrease in the porosity of the sand sample and an increase in the relative density, thereby causing a series of effects on its strength, deformation, permeability and other mechanical properties. In the compaction process of preparing triaxial samples of calcareous sand, if the traditional compaction method in the relevant technology is used, although it is changed to a static compaction processing method, the compaction principle is similar. The soil sample often causes additional particle breakage in the sample due to the action of the longitudinal load, resulting in easy deformation and collapse, which affects the subsequent triaxial test results. Utility Model Content

[0005] The present invention provides a triaxial test sample preparation device suitable for calcareous sand, which can solve the technical problem that the prepared sample is prone to deformation and collapse due to defects in the compaction method in the prior art. The technical solution is as follows:

[0006] The utility model provides a triaxial test sample preparation device suitable for calcareous sand, comprising: a mounting seat, a sample preparation mold, a placing mechanism and a vibrating mechanism.

[0007] The mounting base includes a base plate and a bracket arranged on the base plate;

[0008] The sample preparation mold comprises a sample preparation tube and a base, wherein the base is arranged on the bottom plate, the axis of the sample preparation tube is perpendicular to the bottom plate and one end of the sample preparation tube is detachably connected to the base;

[0009] The delivery mechanism comprises a delivery funnel, which is connected to the bracket and arranged above the sample preparation tube, and the discharge port of the delivery funnel is directly opposite to the other end opening of the sample preparation tube;

[0010] The vibrating mechanism is arranged on the bottom plate, and includes a motor, a transmission mechanism and a knocking ring. The knocking ring is sleeved on the outer side of the sample preparation tube, and a knocking block is arranged on the inner ring of the knocking ring. The motor is connected to the knocking ring through the transmission mechanism, and is used to drive the knocking ring to move back and forth in the horizontal direction.

[0011] Optionally, the knocking ring includes a first ring body and a second ring body in a semicircular arc shape, and both ends of the first ring body and the second ring body are detachably connected.

[0012] Optionally, a lifting screw is rotatably provided on the bottom plate, the lifting screw is located beside the base and is sleeved with a threaded ring, at least one of the first ring body and the second ring body is provided with a transmission rod perpendicular to the lifting screw, a strip hole is provided on the transmission rod along the length direction, the end of the transmission rod is connected to the transmission mechanism, and the threaded ring can be slidably nested in the strip hole.

[0013] Optionally, a rubber film is tightly arranged on the inner wall of the sample preparation tube, a pull rod is arranged on the outer wall of the sample preparation tube, and an air hole communicating with the inner wall of the sample preparation tube is arranged on the pull rod.

[0014] Optionally, the sample preparation tube includes a first extrusion ring and two side cylinders arranged in a matched manner, the top of the side cylinder is provided with a first flange, and the first extrusion ring is sleeved on the top of the side cylinder and is detachably connected to the first flange.

[0015] Optionally, a second flange is provided at the bottom of the side cylinder, and the second flange is detachably connected to the base.

[0016] Optionally, the base is cylindrical, a second extrusion collar is sleeved on the side wall of the base, a first threaded hole is provided on the second extrusion collar, and a second threaded hole matching the first threaded hole is provided on the second flange.

[0017] Optionally, the diameter of the base matches the inner diameter of the sample preparation cylinder.

[0018] Optionally, the inner side wall of the sample preparation cylinder has scale lines arranged along the axial direction.

[0019] Optionally, the delivery mechanism also includes an adjusting screw and a telescopic rod, and the adjusting screw and the telescopic rod are arranged perpendicularly and parallel to the base plate with intervals, the adjusting screw is passed through the bracket and one end is connected to the top of the delivery funnel, and the two ends of the telescopic rod are respectively connected to the bracket and the delivery funnel.

[0020] The beneficial effects brought by the technical solution provided by the embodiment of the utility model include at least:

[0021] Compared with the traditional sample preparation method of drop hammer compaction, this sample preparation process uses vibration to compact, which reduces the particle breakage of the sample during the sample preparation process, and the internal sample is subjected to more uniform force. It can solve the technical problem that the prepared sample is prone to deformation and collapse due to the defects of the compaction method in the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a structural schematic diagram of a triaxial test sample preparation device suitable for calcareous sand provided in an embodiment of the utility model;

[0024] Figure 2 It is a structural schematic diagram of a mounting base provided by an embodiment of the utility model;

[0025] Figure 3 It is a structural schematic diagram of a sample preparation mold provided by an embodiment of the utility model;

[0026] Figure 4 It is a structural schematic diagram of the delivery mechanism provided by an embodiment of the utility model;

[0027] Figure 5 It is a structural schematic diagram of a vibrating mechanism provided in an embodiment of the utility model.

[0028] In the figure: 1-mounting seat; 2-sample preparation mold; 3-dispensing mechanism; 4-vibrating mechanism; 11-bottom plate; 12-bracket; 21-sample preparation tube; 21a-pull rod; 22-base; 23-rubber membrane; 31-dispensing funnel; 32-adjusting screw; 33-telescopic rod; 41-motor; 42-transmission mechanism; 43-knocking ring; 43a-first ring body; 43b-second ring body; 111-lifting screw; 112-threaded collar; 121-vertical rod; 1 22-top plate; 211-first extrusion collar; 212-side cylinder; 213-scale line; 221-second extrusion collar; 222-first threaded hole; 421-frame; 422-eccentric wheel; 423-spring rod; 424-arc plate; 425-top rod; 431-knocking block; 432-transmission rod; 2121-first flange; 2122-second flange; 2123-second threaded hole; 4251-guide groove; 4321-strip hole. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] In the related art, indoor triaxial specimens are made by controlling the density of the specimens, using layered batching, layered filling, and layered compaction methods. For example, the sample preparation device for geotechnical triaxial testing disclosed in publication number CN218496547U uses a drop hammer to compact the specimen, and uses a triaxial test sample preparation device and a triaxial test machine axial loading platform to compact the soil sample in the sample preparation tube to prepare the specimen.

[0031] As a non-continuous soil medium, calcareous sand has been widely used in the field of geotechnical engineering. It is often used in the construction of marine platforms, docks, embankments and marine structures such as reclamation of islands and reefs in the South China Sea. The strength of calcareous sand is low, and it is easy to produce particle breakage when it is subjected to large loads. The fine particles produced by particle breakage fill the pores of calcareous sand, increasing the contact between particles while changing the pore structure of the soil, resulting in a decrease in the porosity of the sand sample and an increase in the relative density, thereby causing a series of effects on its strength, deformation, permeability and other mechanical properties. In the compaction process of preparing triaxial samples of calcareous sand, if the traditional compaction method in the relevant technology is used, although it is changed to a static compaction processing method, the compaction principle is similar. The soil sample often causes additional particle breakage in the sample due to the action of the longitudinal load, resulting in easy deformation and collapse, which affects the subsequent triaxial test results.

[0032] Figure 1 It is a structural schematic diagram of a triaxial test sample preparation device suitable for calcareous sand provided in an embodiment of the utility model; Figure 2It is a structural schematic diagram of a mounting base provided by an embodiment of the utility model;

[0033] Figure 3 It is a structural schematic diagram of a sample preparation mold provided by an embodiment of the utility model; Figure 4 It is a structural schematic diagram of the delivery mechanism provided by an embodiment of the utility model; Figure 5 Schematic diagram of the structure of the vibrating mechanism provided by the embodiment of the utility model. Figures 1 to 5 The triaxial test sample preparation device suitable for calcareous sand shown in the figure comprises a mounting seat 1, a sample preparation mold 2, a placing mechanism 3 and a vibrating mechanism 4.

[0034] The mounting base 1 includes a bottom plate 11 and a bracket 12 disposed on the bottom plate 11. Exemplarily, in the embodiment of the utility model, the bracket 12 includes a vertical rod 121 disposed on the bottom plate 11 and a top plate 122 disposed on the top of the vertical rod 121.

[0035] The sample preparation tube 21 comprises a sample preparation tube 21 and a base 22, the base 22 is arranged on the bottom plate 11, the axis of the sample preparation tube 21 is perpendicular to the bottom plate 11 and one end is detachably connected to the base 22. For example, in the embodiment of the utility model, the inner wall of the sample preparation tube 21 has scale lines 213 arranged along the axis direction, and during the process of inserting the calcareous sand material and preparing, the amount added and the height of the sample can be judged and controlled according to the scale lines that are submerged.

[0036] The delivery mechanism 3 includes a delivery funnel 31, which is connected to the bracket 12 and arranged above the sample preparation tube 21, and the discharge port of the delivery funnel 31 is directly opposite to the other end opening of the sample preparation tube 21. Exemplarily, in the embodiment of the utility model, the delivery mechanism 3 also includes an adjusting screw 32 and a telescopic rod 33, which are arranged perpendicularly and parallel to the bottom plate 11, and the adjusting screw 32 is passed through the bracket 12 and one end is connected to the top of the delivery funnel 31, and the two ends of the telescopic rod 33 are respectively connected to the bracket 12 and the delivery funnel 31. The adjusting screw 32 is rotatably passed through the top plate 122, and a handle 321 is provided at its end. The staff can control the relative movement of the adjusting screw 32 along the axial direction relative to the top plate 122 by twisting the handle 321 to control the delivery funnel 31 below to rise and fall. The discharge port of the feeding funnel 31 can be extended into the sample preparation tube 21 to stably discharge the material, so as to conveniently control the amount of calcareous sand material discharged into the sample preparation tube 21. The telescopic rod 33 connected between the top plate 122 and the feeding funnel 31 can limit and guide the lifting trajectory of the feeding funnel 31 while being adaptively extended and retracted, thereby improving the working stability of the experimental sample preparation device.

[0037] The vibrating mechanism 4 is arranged on the bottom plate 11, and includes a motor 41, a transmission mechanism 42 and a knocking ring 43. The knocking ring 43 is sleeved on the outer side of the sample preparation tube 21, and a knocking block 431 is arranged on the inner ring of the knocking ring 43. The motor 41 is connected to the knocking ring 43 through the transmission mechanism 42, and is used to drive the knocking ring 43 to move back and forth in the horizontal direction.

[0038] Optionally, the knocking ring 43 includes a first ring body 43a and a second ring body 43b in a semicircular shape, and the first ring body 43a and the second ring body 43b are detachably connected at both ends. Exemplarily, in an embodiment of the utility model, the first ring body 43a and the second ring body 43b are connected by end bolts, and are fixed by bolts to form a complete ring body during operation. After the preparation of the sample is completed, the first ring body 43a and the second ring body 43b can be disassembled and separated to facilitate the separation and removal of the internal sample preparation tube 21 from the sample, reduce interference, have a simple structure, and are easy to disassemble and assemble, thereby improving the practicality of the triaxial test sample preparation device.

[0039] Optionally, a lifting screw 111 is rotatably provided on the bottom plate 11, the lifting screw 111 is located beside the base 22 and a threaded ring 112 is sleeved on the top, at least one of the first ring body 43a and the second ring body 43b is provided with a transmission rod 432 perpendicular to the lifting screw 111, and a strip hole 4321 is provided on the transmission rod 432 along the length direction, the end of the transmission rod 432 is connected to the transmission mechanism 42, and the threaded ring 112 can be slidably nested in the strip hole 4321.

[0040] Exemplarily, in the embodiment of the utility model, the transmission mechanism 42 is composed of a plurality of substructures, including a frame 421, a motor 41 is mounted at the front end of the frame 421, an eccentric wheel 422 is mounted on the output shaft of the motor 41, a spring rod 423 is mounted on the surface of the frame 421, an arc plate 424 is mounted on the elastic end of the spring rod 423, a top rod 425 arranged in a direction perpendicular to the bottom plate 11 is mounted on the end of the arc plate 424, and a guide groove 4251 is opened inside the top rod 425. The end of the transmission rod 432 is slidably embedded in the guide groove 4251. When the motor 41 is started, the output shaft is used to drive the eccentric wheel 422 to rotate. When the long end of the eccentric wheel 422 abuts against the inner arc of the arc plate 424, the arc plate 424 is pushed to move away from the frame 424, and the spring rod 423 is stretched. When the eccentric wheel 422 rotates to the short end toward the arc plate 424, the arc plate 424 loses contact, and the spring rod 423 contracts, thereby pulling the arc plate 424 to move toward the frame 424. Correspondingly, following the horizontal movement of the arc plate 424, the top rod 425, the transmission rod 432 and the knocking ring 43 connected thereto also move back and forth in the horizontal direction accordingly, so that the knocking block 431 inside the knocking ring 43 knocks back and forth on the side wall of the sample preparation tube 21 to achieve compaction of the sample.

[0041] Furthermore, during the tapping process, the lifting screw 111 is driven to rotate manually or by a related driving structure, and the transmission rod 432 and the tapping ring 43 are lifted and lowered along the guide groove 4251 by the lifting and lowering of the threaded ring 112 relative to the lifting screw 111, so that the tapping ring 43 can tap the different height positions of the sample preparation tube 21 along the axial direction, and adaptively adjust the height of the calcareous sand sample to ensure the reliability of the compaction of the entire sample.

[0042] Optionally, the sample preparation barrel 21 includes a first extrusion collar 211 and two side barrels 212 arranged in a matched manner. The top of the side barrel 212 is provided with a first flange 2121. The first extrusion collar 211 is sleeved on the top of the side barrel 212 and is detachably connected to the first flange 2121. The base 22 is cylindrical, and the diameter of the base 22 matches the inner diameter of the sample preparation barrel 21. During installation, while being matched and spliced, the sample preparation barrel 21 is also sleeved on the outer side wall of the base 22. After the top of the side barrel 212 is closed, the first extrusion collar 211 is used to clamp and fix the top, and at the same time, the first extrusion collar 211 is flange-connected with the two combined first flanges 2121 by inserting bolts to achieve fixation. At the same time, the bottom of the side cylinder 212 is provided with a second flange 2122, the side wall of the base 22 is sleeved with a second extrusion collar 221, the second extrusion collar 221 is provided with a first threaded hole 222, and the second flange 2122 is provided with a second threaded hole 2123 matching the first threaded hole 222. Similar to the top, the bottom of the side cylinder 212 can also be flange-connected through the first threaded hole 222 and the second threaded hole 2123 corresponding to the second flange 2122 and the second extrusion collar 221, thereby improving the overall installation stability. This kind of matched assembly type sample preparation cylinder 21 has a simple overall structure, is easy to assemble and disassemble, is convenient for sample preparation and removal, and has high preparation efficiency.

[0043] Optionally, a rubber film 23 is tightly arranged on the inner wall of the sample preparation tube 21, a pull rod 21a is arranged on the outer wall of the sample preparation tube 21, and an air hole connected to the inner wall of the sample preparation tube 21 is arranged on the pull rod 21a. Exemplarily, in the embodiment of the utility model, the overall working process of the triaxial test sample preparation device is as follows:

[0044] The two side cylinders 212 of the sample preparation tube 21 are butted and sleeved on the outside of the rubber film 23, and a sealing tape is pasted on the butt gap of the sample preparation tube 21 to enhance the air tightness of the device, and the bottom of the sample preparation tube 21 and the base 22 are fixed to the bottom plate 11 by correspondingly inserting bolts into the second flange 2122 and the second extrusion collar 221 at the bottom, and the upper rubber film 23 is turned outward, and the first extrusion collar 211 is inserted for binding, and the hoop is sleeved on the sample preparation tube 21 and fixed with bolts. The air in the cavity between the rubber film 23 and the inner wall of the sample preparation tube 21 is emptied through the air hole of the pull rod 21a by an external pneumatic device, so that the rubber film is close to the inner wall. The calcareous sand of a pre-calculated mass is poured into the sample preparation tube 21 in batches through the feeding funnel 31 whose height can be freely adjusted. After each pouring, the motor 41 of the vibrating mechanism 4 is started to drive the knocking ring 43 to repeatedly knock back and forth on the surrounding surface of the sample preparation tube 21 from the outer wall of the sample preparation tube 21 to achieve the vibration effect. During the vibration process, the sample height is observed through the scale line 213 on the inner wall of the sample preparation tube 21. When the sand sample is vibrated to the pre-calculated height, the vibration is stopped, and the surface of the sample is shaved to make the cross section flat. The height of the vibrating knocking ring 43 is adjusted by the lifting screw 111, and the above-mentioned sample loading steps are repeated until the sample fills the sample preparation tube 21 and is compacted. After completing the sample loading process, turn off the external pneumatic device, remove the bolts at the bottom and top of the sample preparation tube 21, and separate the rubber membrane 23 from the sample preparation tube 21. After the sample preparation tube 21 is separated and removed, when the sample preparation tube 21 is taken out, the second extrusion ring 221 and the base 22 fix the rubber membrane 23 from the bottom, so that the rubber membrane 23 can be automatically retained on the surface of the columnar sample, which is convenient for subsequent use.

[0045] Compared with the traditional sample preparation method of drop hammer compaction, this sample preparation process uses vibration to compact, which reduces the particle breakage of the sample during the sample preparation process and can solve the technical problem that the prepared samples are prone to deformation and collapse due to the defects of the compaction method in the prior art.

[0046] At the same time, during the sample preparation process, the rubber film 23 and the sample preparation tube 21 are firmly fixed by the extrusion ring and the bolt, thereby reducing the disturbance of the sample during the sample preparation and compaction process. At the same time, the overall air tightness of the device is also improved. Therefore, during the sample preparation process, the columnar sample inside the sample preparation mold can be evenly subjected to the load. Since the rubber film 23 is firmly fixed by the bottom, the sample will not collapse and overflow from the bottom, which improves the stability of the sample after preparation, and the force is more uniform, which improves the fault tolerance rate of subsequent tests.

[0047] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the utility model belongs. The words "first", "second" and similar words used in the specification and claims of the utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0048] The above description is only an optional embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A triaxial test sample preparation device suitable for calcareous sand, characterized in that: include: A mounting base (1), a sample preparation mold (2), a delivery mechanism (3) and a vibrating mechanism (4), The mounting base (1) comprises a base plate (11) and a bracket (12) arranged on the base plate (11); The sample preparation mold (2) comprises a sample preparation cylinder (21) and a base (22), wherein the base (22) is arranged on the bottom plate (11), the axis of the sample preparation cylinder (21) is perpendicular to the bottom plate (11) and one end of the sample preparation cylinder (21) is detachably connected to the base (22); The delivery mechanism (3) comprises a delivery funnel (31), the delivery funnel (31) is connected to the bracket (12) and is arranged above the sample preparation cylinder (21), and the discharge port of the delivery funnel (31) is directly opposite to the other end opening of the sample preparation cylinder (21); The vibrating mechanism (4) is arranged on the bottom plate (11), and comprises a motor (41), a transmission mechanism (42) and a knocking ring (43); the knocking ring (43) is sleeved on the outer side of the sample preparation tube (21); a knocking block (431) is arranged on the inner ring of the knocking ring (43); the motor (41) is connected to the knocking ring (43) through the transmission mechanism (42) and is used to drive the knocking ring (43) to move back and forth in a horizontal direction.

2. A triaxial test sample preparation device suitable for calcareous sand according to claim 1, characterized in that: The knocking ring (43) comprises a first ring body (43a) and a second ring body (43b) in a semicircular arc shape, and the two ends of the first ring body (43a) and the second ring body (43b) are detachably connected.

3. A triaxial test sample preparation device suitable for calcareous sand according to claim 2, characterized in that: A lifting screw (111) is rotatably provided on the bottom plate (11), the lifting screw (111) is located beside the base (22) and a threaded collar (112) is sleeved on the top, at least one of the first ring body (43a) and the second ring body (43b) is provided with a transmission rod (432) perpendicular to the lifting screw (111), a strip hole (4321) is provided on the transmission rod (432) along the length direction, the end of the transmission rod (432) is connected to the transmission mechanism (42), and the threaded collar (112) can be slidably nested in the strip hole (4321).

4. A triaxial test sample preparation device suitable for calcareous sand according to claim 1, characterized in that: A rubber film (23) is tightly arranged on the inner wall of the sample preparation tube (21), a pull rod (21a) is arranged on the outer wall of the sample preparation tube (21), and an air hole communicating with the inner wall of the sample preparation tube (21) is arranged on the pull rod (21a).

5. A triaxial test sample preparation device suitable for calcareous sand according to claim 1, characterized in that: The sample preparation tube (21) comprises a first extrusion collar (211) and two side cylinders (212) arranged in a matched manner, the top of the side cylinder (212) is provided with a first flange (2121), the first extrusion collar (211) is sleeved on the top of the side cylinder (212) and is detachably connected to the first flange (2121).

6. A triaxial test sample preparation device suitable for calcareous sand according to claim 5, characterized in that: A second flange (2122) is provided at the bottom of the side cylinder (212), and the second flange (2122) is detachably connected to the base (22).

7. A triaxial test sample preparation device suitable for calcareous sand according to claim 6, characterized in that: The base (22) is cylindrical, a second extrusion collar (221) is sleeved on the side wall of the base (22), a first threaded hole (222) is provided on the second extrusion collar (221), and a second threaded hole (2123) matching the first threaded hole (222) is provided on the second flange (2122).

8. A triaxial test sample preparation device suitable for calcareous sand according to claim 7, characterized in that: The diameter of the base (22) matches the inner diameter of the sample preparation cylinder (21).

9. A triaxial test sample preparation device suitable for calcareous sand according to any one of claims 1 to 8, characterized in that: The inner side wall of the sample preparation cylinder (21) is provided with scale lines (213) arranged along the axial direction.

10. A triaxial test sample preparation device suitable for calcareous sand according to any one of claims 1 to 8, characterized in that: The delivery mechanism (3) further comprises an adjusting screw (32) and a telescopic rod (33), wherein the adjusting screw (32) and the telescopic rod (33) are arranged perpendicularly and parallel to the bottom plate (11) and spaced apart from each other, the adjusting screw (32) is passed through the bracket (12) and one end of the adjusting screw (32) is connected to the top of the delivery hopper (31), and the two ends of the telescopic rod (33) are respectively connected to the bracket (12) and the delivery hopper (31).

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