Solidified soft soil tensile test device

Abstract

The invention discloses a solidified soft soil testing device, and belongs to the technical field of soil mechanical performance testing, the solidified soft soil testing device comprises a base, a top adjusting assembly and a bottom adjusting assembly, the top adjusting assembly and the bottom adjusting assembly are coaxially arranged up and down, the top adjusting assembly comprises a top plate and stand columns located on the two sides of the top plate, and the stand columns are arranged on the top plate. A hinge seat is arranged below the stand column, the hinge seat is fixed to the base, a middle plate is arranged below the top plate, a first hydraulic cylinder is arranged between the middle plate and the top plate, and the first hydraulic cylinder drives the middle plate to slide up and down; the bottom adjusting assembly comprises a bottom plate and a second hydraulic cylinder located below the bottom plate, the second hydraulic cylinder drives the bottom plate to slide up and down, the bottom plate and the middle plate are each provided with a supporting plate, and a test piece is located between the upper supporting plate and the lower supporting plate. According to the invention, the test of compressive strength, shear strength and bending strength can be realized, the application range of the device is greatly expanded, and the utilization rate is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of soil mechanical property testing, and in particular relates to a solidified soft soil testing device. Background Art

[0002] Natural soil lacks sufficient strength and has poor stability, which generally makes it difficult to meet engineering requirements. The soil solidified by soil stabilizers has good engineering properties, which makes it more and more suitable for local soil excavation and in-situ treatment.

[0003] In order to pursue better engineering performance and meet various special soil conditions and engineering needs, it is necessary to test the mechanical properties of soft soil and solidified soft soil. Soft soil mainly undergoes compressive strength tests and shear strength tests due to its high natural water content, high compressibility, low bearing capacity and very low shear strength.

[0004] However, there are the following problems in actual use: 1. Existing mechanical properties testing devices are often laboratory devices, which are large and difficult to carry. It is impossible to obtain materials locally and conduct relevant on-site observations and tests after curing on site. 2. In field tests, precise image data changes are not required, only preliminary data and observed phenomena are required. However, each existing mechanical property test requires a separate test device, and each test device has a complex structure and cannot adapt to multi-functional use under simple conditions. 3. After solidification, the compressibility of soft soil decreases, the strength increases, and the permeability is also improved. Considering the application scenario, not only compressive strength test and shear strength test are required, but also tensile test.

[0005] Therefore, a multifunctional, simple and portable solidified soft soil testing device is needed, which can perform a variety of mechanical property tests. Summary of the invention

[0006] The purpose of the present invention is to provide a solidified soft soil testing device to solve the problems existing in the background technology.

[0007] The objective of the present invention is achieved through the following technical solutions: A solidified soft soil test device comprises a base, a top adjustment assembly and a bottom adjustment assembly, wherein the top adjustment assembly and the bottom adjustment assembly are coaxially arranged up and down, the top adjustment assembly comprises a top plate and columns located on both sides of the top plate, a hinge seat is provided below the column, the hinge seat is fixed to the base, an intermediate plate is provided below the top plate, a first hydraulic cylinder is provided between the intermediate plate and the top plate, and the first hydraulic cylinder drives the intermediate plate to slide up and down; The bottom adjustment assembly is located in the base, and the bottom adjustment assembly includes a bottom plate and a second hydraulic cylinder located below the bottom plate, the second hydraulic cylinder drives the bottom plate to slide up and down, the bottom plate and the middle plate are both provided with T-shaped grooves, the bottom plate and the middle plate are both provided with support plates, the support plates are clamped with the T-shaped grooves, and the test piece is located between the upper and lower support plates.

[0008] Furthermore, the middle plate is slidably connected to the column via a sliding sleeve, the cylinder seat of the first hydraulic cylinder is fixed to the bottom of the top plate, and the piston rod of the first hydraulic cylinder is fixed to the middle plate.

[0009] Furthermore, the base is provided with a step for placing the bottom plate, the cylinder seat of the second hydraulic cylinder is fixed to the inside of the base, and the piston rod of the second hydraulic cylinder is fixed to the bottom plate.

[0010] Furthermore, the top adjustment assembly is rotated 90 degrees through the hinge seat to be horizontal with the base, the top plate and the middle plate are rectangular structures, and the top plate is fixed on the column.

[0011] Furthermore, the support plate is provided with two symmetrically arranged groups of limit assemblies, the limit assemblies include a tightening screw, a connecting plate and a V-shaped slider, the connecting plate is fixed to the support plate, the tightening screw is threadedly connected to the connecting plate, the support plate is provided with a wedge-shaped groove along the axial direction of the tightening screw, the bottom of the V-shaped slider is slidably connected to the support plate through the wedge-shaped groove, and the specimen is fixed by the two symmetrical groups of limit assemblies.

[0012] Furthermore, the support plate located on the middle plate is provided with a limiting claw, and the limiting claw includes a shell and a T-shaped block, a rack, a gear assembly and a claw located in the shell, the top plate of the T-shaped block is fixed to the support plate, the rack is fixed to the bottom of the T-shaped block, the two groups of gear assemblies are respectively located on both sides of the rack and are rotatably connected to the shell, the claw is connected to the respective gear assemblies, and a tension spring is provided between the two symmetrical claws.

[0013] Furthermore, a shear adjustment assembly is provided on the support plate located on the bottom plate, and the shear adjustment assembly includes a base and a pillar, a measuring assembly and a pressing assembly located on the base, the base is slidably connected to the support plate, the measuring assembly is located in the middle of the pillar and slidably connected to the pillar, and the pressing assembly is located at the top of the pillar.

[0014] Furthermore, the downward pressing assembly includes a transverse plate and a pressure plate, one side of the transverse plate is connected to the support column, the pressure plate is located above the specimen, and the pressure plate is connected to the transverse plate by bolts.

[0015] Furthermore, a hydraulic station and a control system are provided in the base, the hydraulic station is connected to the control system, and the hydraulic station is connected to the first hydraulic cylinder and the second hydraulic cylinder respectively.

[0016] The beneficial effects of the present invention are: 1) The structure is simple. One device can be used to test various mechanical properties of solidified soft soil. It is small in size and easy to carry. It can be tested on site.

[0017] 2) It can realize the tests of compressive strength, shear strength and bending strength, which greatly expands the application scope of the device and improves its utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the compression test in Example 1 of the present invention; Figure 2 This is a schematic diagram of the start of the tensile test in Example 2 of the present invention; Figure 3 This is a schematic diagram of the tensile test process in Example 2 of the present invention; Figure 4 This is a schematic diagram of clamping by a limiting assembly in Example 2 of the present invention; Figure 5 This is a schematic diagram of clamping by limiting claws in Example 3 of the present invention; Figure 6 Schematic diagram of the limiting claw in Example 3 of the present invention; Figure 7 It is a front view of the shear test in Example 4 of the present invention; Figure 8 is a top view of a shear test in Example 4 of the present invention; In the figure, 1-base, 2-top adjustment component, 21-top plate, 22-first hydraulic cylinder, 23-middle plate, 24-support plate, 25-column, 26-hinge seat, 27-push block, 3-bottom adjustment component, 31-second hydraulic cylinder, 32-bottom plate, 33-T-slot, 4-test piece, 5-limiting component, 51-tightening screw, 52-connecting plate, 53-V-shaped slider, 54-wedge-shaped slide, 6-limiting claw, 61-T-block, 62-housing, 63-rack, 64-gear assembly, 65-claw, 66-tension spring, 7-shear adjustment component, 71-base, 72-measuring component, 73-pillar, 74-cross plate, 75-pressure plate. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0020] Example 1 The compression test is achieved by this embodiment. Figure 1 As shown, a solidified soft soil test device comprises a base 1, a top adjustment assembly 2 and a bottom adjustment assembly 3, wherein the top adjustment assembly 2 and the bottom adjustment assembly 3 are coaxially arranged up and down, the top adjustment assembly 2 comprises a top plate 21 and columns 25 located on both sides of the top plate 21, an intermediate plate 23 is arranged below the top plate 21, a first hydraulic cylinder 22 is arranged between the intermediate plate 23 and the top plate 21, and the first hydraulic cylinder 22 drives the intermediate plate 23 to slide up and down; The bottom adjustment component 3 is located in the base 1, and the bottom adjustment component 3 includes a bottom plate 32 and a second hydraulic cylinder 31 located below the bottom plate 32. The second hydraulic cylinder 31 drives the bottom plate 32 to slide up and down. The bottom plate 32 and the middle plate 23 are both provided with T-shaped grooves 33. The bottom plate and the middle plate 23 are both provided with support plates 24. The support plates 24 are clamped with the T-shaped grooves 33, and the test piece 4 is located between the upper and lower support plates 24.

[0021] A hydraulic station and a control system are provided in the base 1 . The hydraulic station is connected to the control system, and the hydraulic station is connected to the first hydraulic cylinder 22 and the second hydraulic cylinder 31 , respectively.

[0022] Through the above technical solution, the cured test piece 4 is placed on the support plate 24 on the bottom plate 32, and the support plate 24 is plugged into the bottom plate 32 through the T-shaped slot 33. Since the cylinder seat of the second hydraulic cylinder 31 is fixed to the inside of the base 1, the piston rod is fixed to the bottom plate 32, and the base 1 is provided with a step for placing the bottom plate 32, the second hydraulic cylinder 31 is retracted at this time, and the bottom plate 32 is completely placed on the step; At this time, the first hydraulic cylinder 22 at the top is also in a retracted state. Since the middle plate 23 is slidably connected to the column 25 through a sliding sleeve, the cylinder seat of the first hydraulic cylinder 22 is fixed to the bottom of the top plate 21, and the piston rod of the first hydraulic cylinder 22 is fixed to the middle plate 23. Therefore, the first hydraulic cylinder 22 and the middle plate 23 are connected as a whole, and the middle plate 23 is also in a retracted state. At the same time, the support plate 24 on the middle plate 23 is also fixed by plugging in the T-slot 33 and will not fall off.

[0023] After the test piece 4 is placed, the first hydraulic cylinder 22 is started, and the piston rod of the first hydraulic cylinder 22 extends, driving the middle plate 23 and the support plate 24 on the middle plate 23 to press down the test piece 4, so as to perform a compression test. Furthermore, a sensor is provided on the middle plate 23 or the support plate 24, and the compressive strength of the solidified soft soil is recorded by the sensor.

[0024] Example 2 Through this embodiment, the tensile test is carried out. On the basis of Example 1, Figure 2-Figure 4 As shown, the intermediate plate 23 and the support plate 24 on the bottom plate 32 are both provided with a limit assembly 5, the limit assembly 5 includes a tightening screw 51, a connecting plate 52 and a V-shaped slider 53, the connecting plate 52 is fixed to the support plate 24, the tightening screw 51 is threadedly connected to the connecting plate 52, the support plate 24 is provided with a wedge-shaped groove 54 along the axial direction of the tightening screw 51, the bottom of the V-shaped slider 53 is slidably connected to the support plate 24 through the wedge-shaped groove 54, and the specimen 4 is fixed by two symmetrical groups of limit assemblies 5.

[0025] Specifically, the specimen 4 is placed on the supporting plate 24 below, and the second hydraulic cylinder 31 drives the specimen 4 to rise to a certain height. The screw 51 is screwed in the direction of the specimen 4, and then the nail head of the tightened screw 51 pushes the V-shaped slider 53 to move toward the specimen 4. Since the V-shaped slider 53 slides along the wedge-shaped groove 54, the V-shaped slider 53 will not fall out and maintain linear movement, and the clamping is completed by the V-shaped slider 53 pressing against the specimen 4; similarly, the upper side of the specimen 4 is also clamped by the limit assembly 5.

[0026] At this time, the first hydraulic cylinder 22 and the second hydraulic cylinder 31 are both in an extended state. When the specimen 4 is clamped, the first hydraulic cylinder 22 and the second hydraulic cylinder 31 are retracted synchronously. At this time, a tensile test is performed on the solidified soft soil specimen 4, and tensile data can be obtained through the built-in sensor.

[0027] Example 3 Based on Example 2, see Figure 5 and Figure 6 The limiting claw 6 replaces the limiting component 5 in Example 2. The limiting claw 6 includes a shell 62 and a T-shaped block 61, a rack 63, a gear assembly 64 and a claw 65 located in the shell 62. The top plate 21 of the T-shaped block 61 is fixed to the support plate, and the rack 63 is fixed to the bottom of the T-shaped block 61. The two groups of gear assemblies 64 are respectively located on both sides of the rack 63 and are rotatably connected to the shell 62. The claw 65 is connected to the respective gear assemblies 64, and a tension spring 66 is provided between the two symmetrical claws 65.

[0028] Specifically, when performing a unidirectional tensile test, the lower end of the specimen 4 can be fixed to the lower support plate 24 by epoxy resin glue, and then the upper part of the specimen 4 is clamped by the limit claw 6. Since the two claws 65 are connected by the tension spring 66, the claws 65 are in a closed state under normal conditions. At this time, the claws 65 are opened and placed on the specimen 4, and then the first hydraulic cylinder 22 is started. The first hydraulic cylinder 22 drives the middle plate 23 to move upward. Since the T-shaped block 61 is connected to the support plate 24 on the middle plate 23, the T-shaped block 61 and the rack 63 are driven to rise accordingly. Since the claw 65 is connected to the specimen 4 under the action of the tension spring 66, and the lower part of the specimen 4 is fixed to the lower support plate 24, when the rack 63 rises, it drives the gear assembly 64 to transmit, and then drives the claw 65 to shrink inward and further clamp the specimen 4, and then completes the unidirectional tensile test of the specimen 4 as the first hydraulic cylinder 22 shrinks. The limit claw 6 can improve the connection strength and prevent the specimen 4 from falling out during the stretching process.

[0029] Example 4 The shear test was carried out in this embodiment. Based on Example 1, refer to Figure 7 and Figure 8 A hinge seat 26 is provided under the column 25, and the hinge seat 26 is fixed to the base 1. When the top adjustment component 2 is rotated 90 degrees through the hinge seat 26 to be horizontal with the base 1, the side plates of the top plate 21 and the middle plate 23 abut against the base 1, and the top adjustment component 2 is supported by the base 1.

[0030] During the shear test, the test piece 4 is placed in a shear box that can be separated up and down, and the lower shear box is provided with a ball bearing for easy sliding.

[0031] Before conducting the shear test, the shear box containing the specimen 4 is placed on the support plate 24 below. At this time, the support plate 24 below is installed with a shear adjustment assembly 7, which includes a base 71 and a pillar 73 located on the base 71, a measuring assembly 72 and a pressing assembly. The base 71 is slidably connected to the support plate 24, the measuring assembly 72 is located in the middle of the pillar 73 and is slidably connected to the pillar 73, and the pressing assembly is located at the top of the pillar 73.

[0032] The support plate 24 below is provided with a linear slide groove to facilitate the sliding connection of the base 71, and the pillar 73 is fixed on the base 71. The measuring component 72 can be an electronic sensor or an ordinary dial indicator. The measuring component 72 is abutted against the shear box placed on it by sliding the base 71, and the test piece 4 is pressed toward the support plate 24 by the pressing component at the same time. The pressing component includes a cross plate 74 and a pressure plate 75. One side of the cross plate 74 is connected to the pillar 73. The pressure plate 75 is located above the test piece 4. The pressure plate 75 is connected to the cross plate 74 by bolts. The bolts on the pressure plate 75 are adjusted to make the pressure plate 75 abut against the top of the test piece 4 to complete the downward pressure.

[0033] At the same time, the top adjustment assembly 2 on one side of the test piece 4 is placed horizontally, so that the first hydraulic cylinder 22 is in a horizontal state, and the support plate 24 on the middle plate 23 is provided with a push block 27, which abuts against one side of the shear box below.

[0034] After the shear test starts, the first hydraulic cylinder 22 drives the middle plate 23 to move toward the specimen 4, and the integrated push block 27 pushes the lower shear box to move toward the measuring component 72, while the upper shear box remains relatively stationary due to the action of the downward pressure component. At this time, the specimen 4 is sheared up and down, and the horizontal force is measured by the measuring component 72, thereby realizing the shear test of the solidified soft soil.

[0035] Example 5 On the basis of Example 2, when the test piece 4 is in a certain tensile state, due to the existence of the hinge seat 26, the bending test of the solidified soft soil can be realized by rotating the top adjustment component 2 to a certain angle.

[0036] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A solidified soft soil testing device, characterized in that: The invention comprises a base (1), a top adjustment component (2) and a bottom adjustment component (3), wherein the top adjustment component (2) and the bottom adjustment component (3) are coaxially arranged up and down, the top adjustment component (2) comprises a top plate (21) and columns (25) located on both sides of the top plate (21), a hinge seat (26) is provided below the column (25), the hinge seat (26) is fixed to the base (1), an intermediate plate (23) is provided below the top plate (21), a first hydraulic cylinder (22) is provided between the intermediate plate (23) and the top plate (21), and the first hydraulic cylinder (22) drives the intermediate plate (23) to slide up and down; The bottom adjustment component (3) is located in the base (1), and comprises a bottom plate (32) and a second hydraulic cylinder (31) located below the bottom plate (32). The second hydraulic cylinder (31) drives the bottom plate (32) to slide up and down. The bottom plate (32) and the middle plate (23) are both provided with a T-shaped groove (33). The bottom plate (32) and the middle plate (23) are both provided with a support plate (24). The support plate (24) is clamped with the T-shaped groove (33). The test piece (4) is located between the upper and lower support plates (24).

2. The solidified soft soil testing device according to claim 1, characterized in that: The middle plate (23) is slidably connected to the column (25) via a sliding sleeve, the cylinder seat of the first hydraulic cylinder (22) is fixed to the bottom of the top plate (21), and the piston rod of the first hydraulic cylinder (22) is fixed to the middle plate (23).

3. The solidified soft soil testing device according to claim 1, characterized in that: The base (1) is provided with a step for placing the bottom plate (32); the cylinder seat of the second hydraulic cylinder (31) is fixed to the inside of the base (1); and the piston rod of the second hydraulic cylinder (31) is fixed to the bottom plate (32).

4. The solidified soft soil testing device according to claim 1, characterized in that: The top adjustment component (2) is rotated 90 degrees through the hinge seat (26) to be level with the base (1); the top plate (21) and the middle plate (23) are rectangular structures; and the top plate (21) is fixed on the column (25).

5. The solidified soft soil testing device according to claim 1, characterized in that: The support plate (24) is provided with two groups of symmetrically arranged limit assemblies (5), the limit assemblies (5) comprising a tightening screw (51), a connecting plate (52) and a V-shaped slider (53), the connecting plate (52) being fixed to the support plate (24), the tightening screw (51) being threadedly connected to the connecting plate (52), the support plate (24) being provided with a wedge-shaped slide groove (54) along the axial direction of the tightening screw (51), the bottom of the V-shaped slider (53) being slidably connected to the support plate (24) via the wedge-shaped slide groove (54), and the test piece (4) being fixed via the two symmetrical groups of limit assemblies (5).

6. The solidified soft soil testing device according to claim 1, characterized in that: The support plate (24) located on the middle plate (23) is provided with a limiting claw (6), and the limiting claw (6) comprises a shell (62) and a T-shaped block (61), a rack (63), a gear assembly (64) and a claw (65) located in the shell (62), the top plate (21) of the T-shaped block (61) is fixed to the support plate (24), the rack (63) is fixed to the bottom of the T-shaped block (61), two groups of gear assemblies (64) are respectively located on both sides of the rack (63) and are rotatably connected to the shell (62), the claw (65) is connected to the respective gear assemblies (64), and a tension spring (66) is provided between the two symmetrical claws (65).

7. The solidified soft soil testing device according to claim 1, characterized in that: The support plate (24) located on the bottom plate (32) is provided with a shear adjustment component (7), the shear adjustment component (7) comprising a base (71) and a pillar (73) located on the base (71), a measuring component (72) and a pressing component, the base (71) being slidably connected to the support plate (24), the measuring component (72) being located in the middle of the pillar (73) and being slidably connected to the pillar (73), and the pressing component being located at the top of the pillar (73).

8. The solidified soft soil testing device according to claim 6, characterized in that: The pressing assembly comprises a transverse plate (74) and a pressing plate (75), one side of the transverse plate (74) is connected to the support column (73), the pressing plate (75) is located above the test piece (4), and the pressing plate (75) is connected to the transverse plate (74) by bolts.

9. The solidified soft soil testing device according to claim 1, characterized in that: A hydraulic station and a control system are provided in the base (1); the hydraulic station is connected to the control system, and the hydraulic station is respectively connected to the first hydraulic cylinder (22) and the second hydraulic cylinder (31).

Images