A layered compaction triaxial test remolded soil sample preparation instrument

Abstract

The utility model discloses a layered compaction triaxial test remolded soil sample preparation appearance can, including outer support, and outer support includes bottom plate, and a plurality of support bars are fixedly connected on the bottom plate, and the top of support bar is fixedly connected with the top plate, and the first threaded hole is seted up on the top plate, and the first threaded hole is threadedly connected with the threaded tube, and the hydraulic jack is fixedly connected in the threaded tube, and the output of hydraulic jack is fixedly connected with the threaded rod, and the first limit board and second limit board are arranged on the threaded rod, and the first limit board is attached with the top plate, and the second limit board is located below the first limit board, and the compaction disc is fixedly connected with the lower extreme of threaded rod, and the stress tray is seted up on the bottom plate, and the stress tray is detachably connected with the pressing sample cylinder on, and the pressing sample cylinder is fixedly connected with the pressure -bearing plate on. The device structure design is simple and clear, and the dismounting process is smooth, and the operation is simple and fast, not only reduces the cost, but also prolongs the service life, can provide accurate, efficient and reliable result in the sample preparation process.

Description

Technical Field

[0001] This utility model relates to the field of soil sample preparation instruments, and in particular to a soil sample preparation instrument for triaxial testing that can be layered and compacted. Background Technology

[0002] Indoor geotechnical testing is one of the core methods for exploring the complex mechanical properties of soil. It is not only the cornerstone of the accuracy of soil mechanics theory but also a powerful driving force for theoretical innovation and deepening in this field. Among numerous tests, triaxial testing stands out for its unique position, enabling in-depth analysis of soil strength properties and precise measurement of shear strength. However, a key challenge emerges during triaxial testing: multiple standard cylindrical undisturbed soil specimens are typically required, but the difficulty of field sampling and the complexity of soil sample remodeling during the test often result in insufficient specimens to meet testing standards. Furthermore, to broaden our understanding of soil mechanical properties, especially the study of soil behavior under different densities and compaction conditions, current soil sample preparation techniques face unprecedented challenges. Given the extreme challenge of directly obtaining undisturbed soil specimens from the natural environment that meet all testing conditions, researchers have turned to disturbed soil as an alternative, preparing soil samples suitable for triaxial testing through a carefully designed remodeling process.

[0003] Currently, the preparation of triaxial test specimens mainly relies on a hammer compacting soil samples layer by layer in a compactor to achieve a certain density. While this method can meet the needs of conventional geotechnical testing, it reveals several significant limitations in practical applications: First, it lacks flexibility, making it difficult to precisely control the density or compaction degree of the specimen to a preset level; second, the load applied by the hammer is highly dependent on manual operation, resulting in variability and, due to the lack of a clear standard for the number of hammer blows per layer, the evaluation of compaction effect relies on subjective judgment, increasing uncertainty and blind spots; third, due to the uncontrollability of manual operation, the compaction effect of each soil layer is often inconsistent, and this interlayer difference directly affects the accuracy of the test results for the strength parameters of the entire specimen; finally, and most importantly, existing technology cannot effectively prepare triaxial test specimens with different preset densities or compaction degrees, limiting the diversity and depth of testing. In summary, the current triaxial test specimen preparation method faces multiple problems, including cumbersome operation, poor sample uniformity, insufficient preparation accuracy, and high labor intensity. Utility Model Content

[0004] The purpose of this invention is to provide a sample preparation instrument for remolded soil in triaxial tests that can be compacted in layers, so as to solve the problems existing in the prior art.

[0005] To achieve the above objectives, this utility model provides the following solution: This utility model provides a stratified compaction triaxial test remolded soil sample preparation apparatus, comprising:

[0006] An external support frame includes a base plate, on which several support rods are fixedly connected. A top plate is fixedly connected to the top of each support rod. A first threaded hole is provided on the top plate, and a threaded tube is threaded into the first threaded hole. A hydraulic jack is fixedly connected inside the threaded tube. A threaded rod is fixedly connected to the output end of the hydraulic jack. A second limiting plate is provided on the threaded rod, located below the first limiting plate. The first limiting plate is in contact with the top plate. A compaction plate is fixedly connected to the lower end of the threaded rod. A force-bearing tray is provided on the base plate, and a pressing sample cylinder is detachably connected to the force-bearing tray. The pressing sample cylinder is located below the compaction plate. The outer diameter of the compaction plate is not greater than the inner diameter of the pressing sample cylinder. A pressure-bearing plate is fixedly connected to the pressing sample cylinder. A brush, a ruler, and a scraper are provided on the first limiting plate.

[0007] Preferably, the first limiting plate has a second threaded hole, and the threaded pipe is threaded into the second threaded hole.

[0008] Preferably, the brush, the ruler, and the shaving blade are all fixedly connected to the first limiting plate by elastic ropes.

[0009] Preferably, the pressing sample cylinder includes a cylinder body, the cylinder body having three segments, the three segments forming the pressing sample cylinder, an annular clamping band being installed on the outside of the cylinder body, and a pressure plate being fixedly connected to the cylinder body.

[0010] Preferably, the pressure plate has a limiting stop, which is adapted to the second limiting plate.

[0011] Preferably, a first slot is fixedly connected to the base plate, the force-bearing tray is engaged in the first slot, a second slot is fixedly connected to the force-bearing tray, and the cylinder is engaged in the second slot.

[0012] Preferably, a plurality of tie rods are fixedly connected to the force-bearing plate, a through hole is provided on the pressure plate, the tie rods are inserted into the through hole, the end of the tie rod is threaded, and a nut is threadedly connected to the tie rod, the nut abutting against the pressure plate.

[0013] The present invention discloses the following technical effects:

[0014] This device uses hydraulic jacks to replace manual hammering, ensuring the consistency of the thickness of each layer of the sample and the uniformity of the relative density. At the same time, it supports adjusting the layer height and number of layers according to specific needs to prepare diverse samples.

[0015] This device is highly reusable, and can be easily adapted to the needs of preparing samples of different specifications by simply adjusting the structure and size of the components.

[0016] The device has a simple and clear structural design, a smooth assembly and disassembly process, and is easy and quick to operate. It not only reduces costs but also extends service life. During the sample preparation process, it can provide accurate, efficient and reliable results while greatly reducing the interference of human factors.

[0017] This device is easy to use and highly versatile, saving users a lot of time and effort. It is an efficient and convenient device for sample preparation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the layered compaction triaxial test remolded soil sample preparation instrument of this utility model;

[0020] Figure 2 This is a top view of the first limiting plate of this utility model;

[0021] Figure 3 This is a front view of the first limiting plate of this utility model;

[0022] Figure 4 This is a top view of the second limiting plate of this utility model;

[0023] The components are as follows: 1. Base plate; 2. Slot 1; 3. Slot 2; 4. Annular clamp; 5. Pressing sample cylinder; 6. Pressure plate; 7. Nut; 8. Tie rod; 9. Support rod; 10. Compactor plate; 11. Threaded rod; 12. Second limiting plate; 13. Brush; 14. Scraper; 15. Ruler; 16. Threaded pipe; 17. First limiting plate; 18. Hydraulic jack; 19. Top plate; 20. External support; 21. First threaded hole; 22. Force-bearing tray. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Reference Figure 1-4 This utility model provides a sample preparation apparatus for remolded soil in triaxial tests that can be compacted in layers, comprising:

[0027] The outer support 20 includes a base plate 1, on which several support rods 9 are fixedly connected. A top plate 19 is fixedly connected to the top of each support rod 9. A first threaded hole 21 is provided on the top plate 19. A threaded tube 16 is threaded into the first threaded hole 21. A hydraulic jack 18 is fixedly connected inside the threaded tube 16. A threaded rod 11 is fixedly connected to the output end of the hydraulic jack 18. A second limiting plate 12 is provided on the threaded rod 11. The second limiting plate 12 is located at the first limiting plate 11. Below the position plate 17, the first limiting plate 17 is attached to the top plate 19. The lower end of the threaded rod 11 is fixedly connected to the compaction plate 10. The bottom plate 1 is provided with a force-bearing tray 22. The force-bearing tray 22 is detachably connected to the pressing sample cylinder 5. The pressing sample cylinder 5 is located below the compaction plate 10. The outer diameter of the compaction plate 10 is not greater than the inner diameter of the pressing sample cylinder 5. The pressing sample cylinder 5 is fixedly connected to the pressure plate 6. The first limiting plate 17 is provided with a brush 13, a ruler 15 and a scraper 14.

[0028] In this device, the threaded tube 16 is fixedly connected to the outer shell of the hydraulic jack 18. The threaded tube 16 is connected to the top plate 19 by threads. Rotating the threaded tube 16 facilitates the adjustment of its position on the top plate 19. The hydraulic jack 18 can drive the threaded rod 11 to move up and down. The first limiting plate 17 is used to stabilize the threaded tube 16. The first limiting plate 17 fits against the top plate 19 to prevent the threaded tube 16 from rotating during use. The threaded rod 11 drives the compaction disc 10 to move. The compaction sample cylinder 5 is filled with soil. The compaction disc 10 moves down into the compaction sample cylinder 5 to compact the soil inside the compaction sample cylinder 5. The second limiting plate 12 is used to limit the depth of the compaction disc 10 entering the compaction sample cylinder 5. After the compaction disc 10 enters the compaction sample cylinder 5, the second limiting plate 12 will fit against the pressure plate 6, thereby achieving the preset density or compaction degree requirements.

[0029] The scheme is further optimized by providing a second threaded hole on the first limiting plate 17, and the threaded tube 16 is threaded into the second threaded hole.

[0030] The first limiting plate 17 can rotate on the threaded tube 16, thereby facilitating the adjustment of the position of the first limiting plate 17 and also allowing the first limiting plate 17 to fit tightly against the top plate 19, stabilizing the threaded tube 16.

[0031] The design was further optimized so that the brush 13, ruler 15 and shaving blade 14 were all fixedly connected to the first limiting plate 17 by elastic ropes.

[0032] The brush 13 can be used to clean the pressing sample cylinder 5, the ruler 15 can measure the distance from the compaction plate 10 to the second limit plate 12, thereby controlling the height during layer pressing, and the scraper 14 can be used to scrape the surface during each layer pressing.

[0033] The scheme is further optimized. The pressing sample cylinder 5 includes a cylinder body with three segments. The three segments form the pressing sample cylinder 5. An annular clamp 4 is installed on the outside of the cylinder body, and a pressure plate 6 is fixedly connected to the cylinder body.

[0034] The annular clamp 4 can tighten the three-lobed cylinder. After the soil sample is pressed, the annular clamp 4 can be removed, and then the three-lobed cylinder can be disassembled one by one to facilitate the removal of the soil sample. The pressed sample cylinder 5 is a triaxial sample container, which is cylindrical in shape and has a three-lobed metal structure that slides up and down to open and close.

[0035] The design is further optimized by adding a limiting stop on the pressure plate 6, which is compatible with the second limiting plate 12.

[0036] The limiting stop is convenient to fit with the second limiting plate 12.

[0037] The scheme is further optimized. A slot 1 2 is fixedly connected to the base plate 1, and the force-bearing tray 22 is snapped into the slot 1 2. A slot 2 3 is fixedly connected to the force-bearing tray 22, and the cylinder is snapped into the slot 2 3.

[0038] Slot 1 2 is used to hold the force-bearing tray 22, and slot 2 3 is used to hold the cylinder.

[0039] The scheme is further optimized by fixing several tie rods 8 to the load-bearing plate, and through holes are opened on the pressure plate 6. The tie rods 8 are inserted into the through holes, and the ends of the tie rods 8 are threaded. Nuts 7 are threadedly connected to the tie rods 8, and the nuts 7 abut against the pressure plate 6.

[0040] Tie rod 8 is used to fix the pressure plate 6 and the cylinder to prevent shaking during the pressing of the soil sample.

[0041] How to use this device:

[0042] (1) Assemble the three-lobed cylinder into a pressing sample cylinder 5 and place it into the slot 2 3. When placing it in, insert the pull rod 8 into the through hole of the pressure plate 6, tighten it with the nut 7, and tighten the cylinder with the ring clamp 4.

[0043] (2) Prepare remolded soil according to the set dry density and moisture content, and divide the pre-made remolded soil into four equal parts according to the volume of the cylinder in the pressing sample tube 5 and the sample size, etc.

[0044] (3) Pour the first precast soil sample into the pressing sample cylinder 5. Using a ruler, measure and mark the appropriate length on the threaded rod from the bottom of the compaction plate 10 upwards. Rotate the second limiting plate 12 to fix it at the marked position on the threaded rod.

[0045] (4) Rotate the threaded pipe 16, adjust the hydraulic jack 18 to a suitable height, place the compaction plate 10 against the upper part of the soil sample, rotate the first limiting plate 17 to fit the top plate 19, fix the threaded pipe 16, apply static pressure downward with the hydraulic jack 18 until the limiting stop on the bearing plate 6 jams the second limiting plate 12, and then lift the compaction plate 10.

[0046] (5) Use brush 13 to roughen the surface of the first layer of soil sample, then pour the second pre-made soil sample into the pressing cylinder 5, use ruler 15 to measure the appropriate length from the bottom of the compaction plate 10 on the threaded rod and mark it (repeat the above steps), and compact the second layer of soil sample.

[0047] (6) Repeat the above steps to compact the third and fourth soil samples;

[0048] (7) Rotate the first limiting plate 17 so that the threaded tube 16 can rotate and rise. Remove the nut 7, take out the pressing sample cylinder 5, open the annular clamp 4, separate the three-lobed cylinder, and gently take out the sample. The sample preparation is now complete.

[0049] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0050] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A stratified compaction apparatus for preparing remolded soil for triaxial testing, characterized in that, include: An outer support (20) includes a base plate (1), on which several support rods (9) are fixedly connected. A top plate (19) is fixedly connected to the top of each support rod (9). A first threaded hole (21) is provided on the top plate (19). A threaded tube (16) is threadedly connected to the first threaded hole (21). A hydraulic jack (18) is fixedly connected inside the threaded tube (16). A threaded rod (11) is fixedly connected to the output end of the hydraulic jack (18). A second limiting plate (12) is provided on the threaded rod (11). The second limiting plate (12) is located at the first limiting plate (11). 17) Below, the first limiting plate (17) is attached to the top plate (19), the lower end of the threaded rod (11) is fixedly connected to the compaction plate (10), the bottom plate (1) is provided with a force-bearing tray (22), the force-bearing tray (22) is detachably connected to the pressing sample cylinder (5), the pressing sample cylinder (5) is located below the compaction plate (10), the outer diameter of the compaction plate (10) is not greater than the inner diameter of the pressing sample cylinder (5), the pressing sample cylinder (5) is fixedly connected to the pressure plate (6), and the first limiting plate (17) is provided with a brush (13), a ruler (15) and a scraper (14).

2. The stratified compaction triaxial test remolded soil sample preparation apparatus according to claim 1, characterized in that: The first limiting plate (17) has a second threaded hole, and the threaded tube (16) is threaded into the second threaded hole.

3. The stratified compaction triaxial test remolded soil sample preparation apparatus according to claim 1, characterized in that: The brush (13), the ruler (15), and the shaving blade (14) are all fixedly connected to the first limiting plate (17) by elastic ropes.

4. The stratified compaction triaxial test remolded soil sample preparation apparatus according to claim 1, characterized in that: The pressing sample cylinder (5) includes a cylinder body, which has three segments. The three segments of the cylinder body form the pressing sample cylinder (5). An annular clamp (4) is installed on the outside of the cylinder body, and the pressure plate (6) is fixedly connected to the cylinder body.

5. The stratified compaction triaxial test remolded soil sample preparation apparatus according to claim 1, characterized in that: The pressure plate (6) has a limiting stop, which is adapted to the second limiting plate (12).

6. The stratified compaction triaxial test remolded soil sample preparation apparatus according to claim 4, characterized in that: The base plate (1) is fixedly connected to a slot one (2), the force-bearing tray (22) is engaged in the slot one (2), the force-bearing tray (22) is fixedly connected to a slot two (3), and the cylinder is engaged in the slot two (3).

7. The stratified compaction triaxial test remolded soil sample preparation apparatus according to claim 1, characterized in that: A number of pull rods (8) are fixedly connected to the force-bearing tray (22). A through hole is provided on the pressure plate (6). The pull rods (8) are inserted into the through hole. The end of the pull rod (8) is threaded. A nut (7) is threadedly connected to the pull rod (8). The nut (7) abuts against the pressure plate (6).

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