Sample compaction device for coarse-grained soil triaxial shear test

Abstract

The invention provides a coarse-grained soil triaxial shear test sample vibration compaction device, and relates to the technical field of coarse-grained soil triaxial shear tests.The coarse-grained soil triaxial shear test sample vibration compaction device comprises a fixing frame, the section of the fixing frame is arranged in a U shape, a vibration compaction assembly is installed on the fixing frame, and a plurality of sets of supporting wheels are installed at the lower end of the fixing frame; l-shaped supporting plates are arranged on the two sides of the fixing frame, the upper ends of the L-shaped supporting plates are hinged to the fixing frame, the L-shaped supporting plates are fixed to the fixing frame through bolts, a bottom plate is installed on the inner side of the fixing frame, an outer cylinder is installed on the bottom plate, fixing assemblies are installed on the two sides of the outer cylinder, and an inner container is arranged on the inner side of the outer cylinder and composed of a left container body and a right container body. A lifting assembly is installed below the bottom plate, and the position of the lifting assembly corresponds to the position of the inner container. Through the design of the supporting wheels and the L-shaped supporting plates, the device can be freely switched between different use states, the overall flexibility is improved, and the carrying and arranging process of the device is greatly simplified.

Description

Technical Field

[0001] The invention relates to the technical field of triaxial shear test of coarse-grained soil, in particular to a vibrating device for a triaxial shear test sample of coarse-grained soil. Background Art

[0002] Among the existing soil mechanics tests, triaxial shear tests are widely used to study the shear strength characteristics of soil, especially for coarse-grained soil. Through triaxial tests, the changes in the pore water pressure of soil samples can be accurately measured, thereby quantitatively obtaining the changes in effective stress in the soil, which is crucial for understanding the behavior of soil under complex stress conditions.

[0003] Before the coarse-grained soil triaxial shear test, the sample needs to be tested for relative density, and then the sample for the coarse-grained soil triaxial shear test is filled according to the maximum dry density of the test. The filling of the coarse-grained soil triaxial shear test sample needs to reach the maximum dry density of the sample. The existing equipment configuration is to fill the sample by manual tamping. This is more labor-intensive and it is difficult to reach the maximum dry density in the test.

[0004] With the development of technology, some equipment has begun to use electric vibration for compaction. Although electric vibration can avoid the unevenness that may occur during manual compaction and improve efficiency and accuracy to a certain extent, the existing electric vibration devices still have certain limitations, such as: the device itself is usually fixed on the ground, and complex operating steps or external auxiliary equipment may be required for adjustment and movement, which is inconvenient to use; after vibration, it is often difficult to remove coarse-grained soil, especially when dealing with large-volume or high-density samples, which can easily cause problems such as material breakage or uneven removal. Therefore, the present invention proposes a vibration device for coarse-grained soil triaxial shear test samples to solve the problems existing in the prior art. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a sample compaction device for triaxial shear test of coarse-grained soil, which has the advantage of being easy to use and can solve the problems existing in the prior art.

[0006] To achieve the object of the present invention, the present invention is realized through the following technical solutions: A compaction device for specimens in triaxial shear tests of coarse-grained soil, comprising a fixing frame, the cross-section of the fixing frame is arranged in a U shape, and a compaction component is installed on the fixing frame. Support wheels are installed at the lower end of the fixing frame, and several groups of support wheels are provided. L-shaped support plates are provided on both sides of the fixing frame, and the upper ends of the L-shaped support plates are hinged to the fixing frame. The L-shaped support plates are fixed to the fixing frame by bolts. A bottom plate is installed inside the fixing frame, and an outer cylinder is installed on the bottom plate. Fixing components are installed on both sides of the outer cylinder, and an inner cylinder is provided inside the outer cylinder. The inner cylinder is composed of a left cylinder body and a right cylinder body. A lifting component is installed below the bottom plate, and the position of the lifting component corresponds to that of the inner cylinder.

[0007] Further improvement lies in: The lifting component includes a bottom frame, the bottom frame is fixedly connected to the bottom plate, and an electric push rod is installed on the bottom frame. An opening is provided on the bottom plate, and a push plate is installed inside the opening. The push plate is connected to the telescopic end of the electric push rod.

[0008] Further improvement lies in: The fixing component includes a fixing plate, the fixing plate is fixedly connected to the bottom plate, and a threaded rod is installed on the fixing plate. A knob is installed at one end of the threaded rod, and the other end of the threaded rod passes through the outer cylinder and is connected to the inner cylinder by threads.

[0009] Further improvement lies in: A positioning frame is installed inside the fixing frame, and the cross-section of the positioning frame is in a U shape. The inside of the positioning frame is in contact with the outside of the bottom plate. Notches are provided on both sides below the bottom plate, and limiting strips are provided inside the notches, and the limiting strips are fixedly connected to the fixing frame.

[0010] Further improvement lies in: The compaction component includes a winch, a compaction plate and a compaction motor. The winch is installed above the fixing frame. A connecting plate is provided inside the fixing frame, and the connecting plate is connected to the output end of the winch. A connecting frame is installed below the connecting plate. The compaction plate is installed below the connecting frame through springs, and a compaction motor is installed on the compaction plate. Several groups of springs are evenly provided.

[0011] Further improvement lies in: Slide rails are installed on both sides inside the fixing frame, and connecting rods are installed on the slide rails through sliders. The connecting rods are connected to the connecting plate.

[0012] Further improvement lies in: A first extension part is provided on the connecting plate, a second extension part is provided on the connecting frame, and the second extension part is connected to the first extension part by threads.

[0013] Further improvement lies in: A battery pack is installed above the bottom frame.

[0014] The beneficial effects of the present invention are:

[0015] (1) The present invention enables the device to switch freely between different usage states through the design of support wheels and L-shaped support plates. The provision of support wheels enables the device to be placed stably when not in use and is convenient for moving before use. By pulling out the L-shaped support plate and contacting it with the ground, the device can be effectively supported to be in a stable state. As a result, when the device needs to be adjusted in position or rearranged, the operation is simpler, the complexity of manual operation is reduced, and the overall flexibility is improved, which greatly simplifies the handling and arrangement process of the device and avoids the situation in which complex steps or external equipment assistance are required in traditional equipment.

[0016] (2) The present invention uses a split-type inner liner and a lifting assembly to allow the user to easily disassemble the inner liner after compaction, thereby completely removing the compacted soil sample. Compared with traditional equipment, the split-type design of the inner liner greatly reduces the difficulty of sampling and ensures the stability of the sample during the removal process.

[0017] (3) The overall structure of the present invention is relatively simple, and it mostly adopts a detachable and replaceable design, which allows users and caregivers to easily clean, maintain and replace it, avoiding complicated maintenance operations, helping to improve work efficiency, while also reducing the incidence of equipment failures, improving the convenience and economy of experimental operations, and being suitable for long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view structural schematic diagram of the present invention.

[0019] Figure 2 It is a front view schematic diagram of the fixing frame after the L-shaped support plate of the present invention is unfolded.

[0020] Figure 3 It is a schematic diagram of the top view of the structure of the positioning frame of the present invention after installation.

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the inner container of the present invention.

[0022] Figure 5 It is a front view structural schematic diagram of the connection between the connecting frame and the connecting plate of the present invention.

[0023] Among them: 1. fixed frame; 2. support wheel; 3. L-shaped support plate; 4. bottom plate; 5. outer cylinder; 6. liner; 7. bottom frame; 8. electric push rod; 9. push plate; 10. fixed plate; 11. threaded rod; 12. positioning frame; 13. notch; 14. limit strip; 15. winch; 16. vibrating plate; 17. vibrating motor; 18. connecting plate; 19. connecting frame; 20. slide rail; 21. connecting rod; 22. first extension part; 23. second extension part; 24. battery pack; 25. raised structure. DETAILED DESCRIPTION

[0024] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with examples. The examples are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0025] The triaxial shear test has significant advantages over the direct shear test. In particular, the stress distribution in the triaxial specimen is relatively uniform, making it an ideal method for studying the behavior of soil under actual engineering conditions. The triaxial test can provide more accurate data under different stress conditions, especially in simulating the changes in soil stress and pore water pressure. Through these test results, the shear strength indicators of the soil, including the internal friction angle and cohesion, can be accurately determined, which is of great significance for soil stability analysis and foundation design.

[0026] In the process of preparing coarse-grained soil samples in the existing triaxial shear test equipment, the coarse-grained soil triaxial shear test sample needs to reach the maximum dry density of the sample, so it needs to be vibrated. The configuration of existing equipment mostly relies on manual tamping to fill the coarse-grained soil sample. This method is not only time-consuming and requires a lot of manpower, but in actual operation, it is often difficult to fill the sample to reach the maximum dry density. Since the filling process relies on the manual operation of the operator, there is a certain uncertainty in the degree of vibration of each sample, which affects the repeatability and accuracy of the experimental results.

[0027] Therefore, according to Figure 1-Figure 5As shown in the figure, this embodiment proposes a compaction device for specimens in triaxial shear tests of coarse-grained soil, including a fixing frame 1. The cross-section of the fixing frame 1 is U-shaped. A support wheel 2 is installed at the lower end of the fixing frame 1, and several groups of support wheels 2 are provided. In this embodiment, two groups of support wheels 2 are respectively installed on both sides of the lower end of the fixing frame 1. Therefore, when this device is in use, the movement of this device is facilitated through the provided support wheels 2. Further, L-shaped support plates 3 are provided on both sides of the fixing frame 1, and the upper ends of the L-shaped support plates 3 are hinged to the fixing frame 1. The L-shaped support plates 3 are fixed to the fixing frame 1 by bolts. In this device, the length of the L-shaped support plate 3 corresponds to the width of the fixing frame 1. During the process of compacting the specimen, the stability of this device needs to be maintained. Therefore, during use, the L-shaped support plate 3 is pulled out, and its shorter end is made to contact the ground, and then it is fixed to the fixing frame 1. Correspondingly, a convex structure 25 for limiting is provided on the outer side of the fixing frame 1. When the L-shaped support plate 3 fits with the convex structure 25, it indicates that the position of the L-shaped support plate 3 has reached the predetermined position. At this time, this device is supported by the L-shaped support plate 3. Therefore, during the compaction process, when the L-shaped support plate 3 contacts the ground, the support plate can effectively support the fixing frame 1, preventing the equipment from tilting or being unstable. After being fixed by bolts, the L-shaped support plate 3 can be firmly held in the preset position, ensuring that the entire device will not move due to external forces or vibrations.

[0028] A bottom plate 4 is installed inside the fixing frame 1, and an outer cylinder 5 is installed on the bottom plate 4. The lower end of the inner cavity of the outer cylinder 5 is in direct contact with the bottom plate 4, and its upper end communicates with the outside. An inner cylinder 6 is provided inside the outer cylinder 5. The inner cylinder 6 is composed of a left cylinder body and a right cylinder body. In this device, the inner cylinder 6 is used to store the coarse-grained soil to be compacted. After the inner cylinder 6 is placed in the outer cylinder 5, it is limited by the outer cylinder 5, prompting the left cylinder body and the right cylinder body to be in close contact and fixed by a fixing component. After the coarse-grained soil is compacted, the fixed state of the fixing component is released. At this time, the inner cylinder 6 can be directly taken out of the outer cylinder 5, and with a split design, it is convenient to take out the compacted coarse-grained soil, thereby improving the convenience of the operator, enabling the compacted coarse-grained soil to be taken out efficiently and conveniently, reducing secondary interference or errors caused during the soil-taking process, and at the same time, the split design makes the cleaning and maintenance work more convenient, effectively improving the service life and continuous stability of the device.

[0029] Fixed components are installed on both sides of the outer cylinder body 5. The fixed components include a fixing plate 10, the fixing plate 10 is fixedly connected to the bottom plate 4, and a threaded rod 11 is installed on the fixing plate 10. One end of the threaded rod 11 is installed with a knob, and the other end of the threaded rod 11 passes through the outer cylinder body 5 and is connected to the inner tank 6 by threads. Correspondingly, a threaded hole is provided on each of the left tank body and the right tank body. After the inner tank 6 is installed, a person rotates the knob by hand to drive the threaded rod 11 to rotate. The threaded rod 11 is connected to the fixing plate 10 by threads. Correspondingly, when the threaded rod 11 is connected to the inner tank 6, it can produce a limiting and fixing effect on the inner tank 6, ensuring the stability of the inner tank 6.

[0030] A lifting component is installed below the bottom plate 4, and the position of the lifting component corresponds to that of the inner tank 6. The lifting component includes a chassis 7, the chassis 7 is fixedly connected to the bottom plate 4, and an electric push rod 8 is installed on the chassis 7. An opening is provided on the bottom plate 4, and a push plate 9 is installed inside the opening. The push plate 9 is connected to the telescopic end of the electric push rod 8. Further, a battery pack 24 is installed above the chassis 7, so that the entire device has an independent power source, which is convenient for use in an environment without an external power source. In this device, two groups of symmetrically arranged sockets are provided on the fixing frame 1, and both ends of the chassis 7 extend into the sockets at the corresponding positions. After the coarse-grained soil sample is compacted, the fixing state of the inner tank 6 is released, and then a person controls the electric push rod 8 to start through a controller (this device has a controller to control all the electronic components in this device). The electric push rod 8 pushes the inner tank 6 to rise through the push plate 9, so as to facilitate the person to take out the inner tank 6, reduce the labor intensity, and improve the work efficiency.

[0031] A positioning frame 12 is installed inside the fixing frame 1, and the cross section of the positioning frame 12 is in a U shape. The inside of the positioning frame 12 is attached to the outside of the bottom plate 4. Concave openings 13 are provided on both sides below the bottom plate 4, limiting strips 14 are provided inside the concave openings 13, and the limiting strips 14 are fixedly connected to the fixing frame 1. The installation method of the positioning frame 12 is as Figure 3 shown. In this device, the bottom plate 4 is in a detachable manner. When it is installed, it is installed by the cooperation of the limiting strip 14, the concave opening 13 and the positioning frame 12. When the bottom plate 4 is completely attached to the positioning frame 12, it is in the established position at this time, so that the position of the inner tank 6 corresponds to the position of the compaction component. Specifically, both the front and rear ends of the concave opening 13 communicate with the outside to avoid being affected by the limiting strip 14. Further, the positioning frame 12 not only provides a positioning function, but also cooperates with the concave opening 13 and the limiting strip 14 of the bottom plate 4 to ensure that the bottom plate 4 can be accurately in place during the installation process and remain stable during the compaction process without displacement or loosening. This enables the inner tank 6 to always remain in a position corresponding to the compaction component, ensuring the accuracy and stability of the compaction process.

[0032] A compaction assembly is installed on the fixed frame 1, and the compaction assembly includes a winch 15, a compaction plate 16 and a compaction motor 17. The winch 15 is installed on the top of the fixed frame 1, and a connecting plate 18 is provided on the inner side of the fixed frame 1, and the connecting plate 18 is connected to the output end of the winch 15 (the winch 15 is provided with a wire rope), and a connecting frame 19 is installed below the connecting plate 18, and a compaction plate 16 is installed below the connecting frame 19 through a spring, and a compaction motor 17 is installed on the compaction plate 16, and the spring is evenly provided in several groups. Slide rails 20 are installed on both sides of the fixed frame 1, and a connecting rod 21 is installed on the slide rail 20 through a slider, and the connecting rod 21 is connected to the connecting plate 18. Specifically, the winch 15 provides power for the compaction plate 16, pushing the compaction plate 16 to vibrate up and down, simulating the vibration process of soil stress. The compaction motor 17 is responsible for driving the compaction plate 16 to ensure the continuity and stability of the vibration process. The setting of the spring can ensure that the compaction plate 16 produces appropriate elasticity during the vibration process, so that the specimen is subjected to more uniform force. The uniform setting of multiple sets of springs further ensures the pressure distribution during the compaction process, avoiding excessive or insufficient local pressure. Accordingly, the compaction plate 16 itself can completely enter the inner liner 6. The cooperation of the connecting rod 21, the slider and the slide rail 20 ensures the stability of the connecting plate 18 during the rising and falling process. Then, during work, after the staff loads the coarse-grained soil into the inner liner 6, they start the winch 15 to lower the connecting plate 18, thereby prompting the compaction plate 16 to enter the inner liner 6 and contact the coarse-grained soil, and then start the compaction motor 17 to compact the coarse-grained soil.

[0033] In the device, the upper end of the fixing frame 1 is provided with a through hole for accommodating the entry and exit of the steel wire rope.

[0034] Furthermore, the connecting plate 18 is provided with a first extension portion 22, and the connecting frame 19 is provided with a second extension portion 23, and the second extension portion 23 is connected to the first extension portion 22 by a thread, and the connection method is as follows: Figure 5 As shown, the connection frame 19 and the connection plate 18 are conveniently connected and disassembled by threaded connection.

[0035] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the framework and scope of application of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A vibrating device for a coarse-grained soil triaxial shear test specimen, comprising a fixing frame (1), characterized in that: The cross-section of the fixing frame (1) is arranged in a U shape, and a vibrating compaction component is installed on the fixing frame (1). A supporting wheel (2) is installed at the lower end of the fixing frame (1), and several groups of supporting wheels (2) are provided. L-shaped support plates (3) are provided on both sides of the fixing frame (1), and the upper ends of the L-shaped support plates (3) are hinged to the fixing frame (1). The L-shaped support plates (3) are fixed to the fixing frame (1) by bolts. A bottom plate (4) is installed inside the fixing frame (1), and an outer cylinder (5) is installed on the bottom plate (4). Fixing components are installed on both sides of the outer cylinder (5), and an inner container (6) is provided inside the outer cylinder (5). The inner container (6) is composed of a left container body and a right container body. A lifting component is installed below the bottom plate (4), and the position of the lifting component corresponds to that of the inner container (6).

2. The vibrating device for triaxial shear test specimens of coarse-grained soil according to claim 1, characterized in that: The lifting component includes a bottom frame (7). The bottom frame (7) is fixedly connected to the bottom plate (4), and an electric push rod (8) is installed on the bottom frame (7). An opening is provided on the bottom plate (4), and a push plate (9) is installed inside the opening. The push plate (9) is connected to the telescopic end of the electric push rod (8).

3. The vibrating device for triaxial shear test specimens of coarse-grained soil according to claim 1, characterized in that: The fixing component includes a fixing plate (10). The fixing plate (10) is fixedly connected to the bottom plate (4), and a threaded rod (11) is installed on the fixing plate (10). A knob is installed at one end of the threaded rod (11). The other end of the threaded rod (11) passes through the outer cylinder (5) and is connected to the inner container (6) by thread.

4. The device for compacting coarse-grained soil triaxial shear test specimens according to claim 1, characterized in that: A positioning frame (12) is installed inside the fixing frame (1). The cross-section of the positioning frame (12) is in a U shape. The inner side of the positioning frame (12) is in contact with the outer side of the bottom plate (4). Notch openings (13) are provided on both sides below the bottom plate (4). A limiting strip (14) is provided inside the notch openings (13), and the limiting strip (14) is fixedly connected to the fixing frame (1).

5. The vibrating device for triaxial shear test specimens of coarse-grained soil according to claim 1, characterized in that: The vibrating compaction component includes a winch (15), a vibrating plate (16), and a vibrating motor (17). The winch (15) is installed above the fixing frame (1). A connecting plate (18) is provided inside the fixing frame (1), and the connecting plate (18) is connected to the output end of the winch (15). A connecting frame (19) is installed below the connecting plate (18). The vibrating plate (16) is installed below the connecting frame (19) through a spring, and a vibrating motor (17) is installed on the vibrating plate (16). Several groups of springs are evenly provided.

6. The device for compacting coarse-grained soil triaxial shear test specimens according to claim 5, characterized in that: Sliding rails (20) are installed on both sides inside the fixing frame (1). A connecting rod (21) is installed on the sliding rails (20) through sliders. The connecting rod (21) is connected to the connecting plate (18).

7. The device for compacting coarse-grained soil triaxial shear test specimens according to claim 5, characterized in that: A first extension part (22) is provided on the connecting plate (18). A second extension part (23) is provided on the connecting frame (19). The second extension part (23) is connected to the first extension part (22) by thread.

8. The device for compacting coarse-grained soil triaxial shear test specimens according to claim 2, characterized in that: A battery pack (24) is installed above the bottom frame (7).

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