Three-box full-self-reaction force in-situ direct shear test device

Abstract

The utility model discloses a three-box full self-counter-force in-situ direct shear test device which comprises a lower counter-force frame serving as a bottom foundation, a vertical connecting assembly is arranged on the lower counter-force frame, an upper counter-force beam is arranged at the upper end of the vertical connecting assembly, a test space is formed between the lower counter-force frame and the upper counter-force beam, and the lower counter-force frame is connected with the upper counter-force beam. A shear box assembly is arranged in the test space, and a vertical counter-force assembly for providing vertical counter-force is arranged between the upper counter-force beam and the shear box assembly. According to the three-box direct shear apparatus, a traditional three-box direct shear apparatus is upgraded and reformed, so that the three-box direct shear apparatus can provide horizontal and vertical counter-force, and stacking or ground anchor construction during testing is avoided. Compared with a common three-box in-situ direct shear apparatus which provides vertical counter-force in a ballasting, stacking platform or ground anchor mode, the three-box in-situ direct shear apparatus can provide the vertical counter-force by means of a force transmission system of the three-box in-situ direct shear apparatus, and the three-box in-situ direct shear apparatus has the effects of saving manpower and material resources during test and saving test time.

Description

Technical Field

[0001] The utility model belongs to the technical field of geotechnical engineering in-situ testing, and in particular relates to a three-box full self-reaction force in-situ direct shear test device. Background Art

[0002] In the actual field sampling process, soil samples are inevitably disturbed to a certain extent, which leads to low indoor shear index and large discreteness. The on-site direct shear test has the characteristics of small disturbance and real test data, and is a reliable means to obtain the actual shear index of the soil layer.

[0003] The in-situ direct shear apparatus is a test device for testing the shear strength of soil in situ. There are several types according to the number of shear boxes and the loading method:

[0004] First, single box direct shear tester

[0005] The device has only one soil box, which uses the soil on the side wall of the test pit to provide horizontal reaction force, and the vertical reaction force can be provided by direct weighting, stacking or ground anchoring.

[0006] Second, double box direct shear apparatus

[0007] The double-box shear apparatus consists of two upper and lower shear boxes, with the shear surface located between the upper and lower boxes. The horizontal reaction force is provided by a reaction groove fixed to the lower box, and the applied horizontal load is transferred to the soil in the lower box through the reaction groove. The vertical reaction system is consistent with the single-box direct shear apparatus, and can adopt the weight method, pile load method or ground anchor.

[0008] In order to solve the problem that the horizontal force and shear surface of the double-box direct shear apparatus cannot be in a straight line, a three-box double-shear surface direct shear apparatus has been developed. The three-box direct shear apparatus consists of three shear boxes: upper, middle and lower. There are two shear surfaces during the test, which are located between the upper box and the middle box and between the middle box and the lower box respectively. The horizontal reaction force is provided by the reaction beam connected to the upper box and the lower box, and the horizontal force is transmitted to the soil of the upper box and the lower box through the reaction beam and the tie rod. The horizontal jack is set at the center of the middle box. During the test, the upper and lower boxes do not move, and only the middle box moves horizontally. Therefore, there is no eccentric load on the upper and lower shear surfaces, and the force is basically uniform.

[0009] However, the above direct shear apparatuses do not solve the vertical reaction force system and still need to use weights, loading platforms or ground anchors. The actual on-site operation is very inconvenient and requires a lot of manpower and materials. Therefore, it is very necessary to study a direct shear apparatus that can provide both horizontal and vertical reaction forces. Summary of the invention

[0010] The utility model is proposed to solve the problems existing in the prior art, and its purpose is to provide a three-box full self-reaction force in-situ direct shear test device.

[0011] The technical solution of the utility model is: a three-box full self-reaction in-situ direct shear test device, including a lower reaction frame as a bottom foundation, a vertical connection component is arranged on the lower reaction frame, an upper reaction beam is arranged on the upper end of the vertical connection component, a test space is formed between the lower reaction frame and the upper reaction beam, a shear box component is arranged in the test space, and a vertical reaction component for providing vertical reaction force is arranged between the upper reaction beam and the shear box component.

[0012] Furthermore, a vertically arranged horizontal reaction beam is also provided in the test space, and a horizontal reaction component for providing a horizontal reaction force is provided on one side of the horizontal reaction beam facing the shear box component.

[0013] Furthermore, the upper reaction beam is arranged horizontally, and the lower reaction frame and the upper reaction beam are parallel.

[0014] Furthermore, the vertical connection assembly includes a vertical tie rod, and the vertical tie rod supports the upper reaction beam.

[0015] Furthermore, the vertical tie rods are divided into at least two groups, and the two groups of vertical tie rods are located on the left and right sides of the shear box assembly.

[0016] Furthermore, the vertical reaction force assembly is a vertical jack, one end of the vertical jack is connected to the lower end of the upper reaction force beam, and the other end is connected to the top of the shear box assembly.

[0017] Furthermore, the horizontal reaction force assembly is a horizontal jack, one end of the horizontal jack is connected to the side wall of the shear box assembly, and the other end is connected to the horizontal reaction force beam.

[0018] Furthermore, a receiving cavity is formed in the shear box assembly, and the test soil is received in the receiving cavity.

[0019] Furthermore, a transverse connection component is provided between the horizontal reaction beam and the shear box component.

[0020] The beneficial effects of the utility model are as follows:

[0021] The utility model upgrades and transforms the traditional three-box direct shear instrument so that the instrument can provide horizontal and vertical reaction forces by itself, thereby avoiding heap loading or ground anchoring during the test.

[0022] Compared with the common three-box in-situ direct shear apparatus which adopts the method of weight, stacking platform or ground anchor to provide vertical reaction force, the utility model can provide vertical reaction force by its own force transmission system, which has the effect of saving manpower and material resources during the test and saving the test time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the utility model;

[0024] Figure 2 It is a connection diagram of the vertical tie rod and the horizontal tie rod in the utility model;

[0025] in:

[0026] 1 Horizontal displacement dial gauge 2 Shear box in box

[0027] 3 Upper shear surface 4 Shear box upper box

[0028] 5 Vertical dynamometer 6 Vertical displacement indicator

[0029] 7 Vertical jack 8 Upper force transmission plate

[0030] 9 Lower force transmission plate 10 Horizontal dynamometer

[0031] 11 Horizontal jack 12 Horizontal reaction beam

[0032] 13 Shear box lower box 14 Lower shear surface

[0033] 15 Upper reaction beam 16 Vertical tie rod

[0034] 17 Lower reaction frame 18 Connecting plate

[0035] 19 Transverse tie rod. DETAILED DESCRIPTION

[0036] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments:

[0037] like Figure 1 to Figure 2 As shown, a three-box full self-reaction in-situ direct shear test device includes a lower reaction frame 17 as a bottom foundation, a vertical connection assembly is arranged on the lower reaction frame 17, an upper reaction beam 15 is arranged on the upper end of the vertical connection assembly, a test space is formed between the lower reaction frame 17 and the upper reaction beam 15, a shear box assembly is arranged in the test space, and a vertical reaction assembly for providing vertical reaction force is arranged between the upper reaction beam 15 and the shear box assembly.

[0038] A vertically arranged horizontal reaction beam 12 is also provided in the test space, and a horizontal reaction component for providing horizontal reaction force is provided on one side of the horizontal reaction beam 12 facing the shear box component.

[0039] The upper reaction beam 15 is arranged horizontally, and the lower reaction frame 17 and the upper reaction beam 15 are parallel.

[0040] The vertical connection assembly includes a vertical tie rod 16 , and the vertical tie rod 16 supports the upper reaction beam 15 .

[0041] The vertical tie rods 16 are divided into at least two groups, and the two groups of vertical tie rods 16 are located on the left and right sides of the shear box assembly.

[0042] The vertical reaction force assembly is a vertical jack 7, one end of which is connected to the lower end of the upper reaction force beam 15, and the other end of which is connected to the top of the shear box assembly.

[0043] The horizontal reaction force assembly is a horizontal jack 11 , one end of which is connected to the side wall of the shear box assembly, and the other end of which is connected to the horizontal reaction force beam 12 .

[0044] A receiving cavity is formed in the shear box assembly, and a test soil body is received in the receiving cavity.

[0045] A transverse connection component is provided between the horizontal reaction beam 12 and the shear box component.

[0046] Specifically, the shear box assembly includes a shear box upper box 4 located at the top, a shear box middle box 2 located in the middle, and a shear box lower box 13 located at the bottom. The shear box upper box 4, the shear box middle box 2, and the shear box lower box 13 are arranged in a vertical straight line.

[0047] Specifically, a horizontal displacement dial gauge 1 is provided at the side wall of the shear box assembly, and the horizontal displacement dial gauge 1 measures the horizontal displacement.

[0048] More specifically, the horizontal displacement dial gauge 1 is arranged at the side wall of the box 2 in the shear box, and the horizontal displacement dial gauge 1 is located on the side away from the horizontal jack 11 .

[0049] Specifically, one end of the horizontal jack 11 is connected to the side wall of the box-in-box 2 of the shear box, and a horizontal dynamometer 10 is provided in the horizontal jack 11, and the horizontal dynamometer 10 measures the horizontal force.

[0050] Specifically, an upper shearing surface 3 is formed between the shearing box upper box 4 and the shearing box middle box 2, and a lower shearing surface 14 is formed between the shearing box middle box 2 and the shearing box lower box 13.

[0051] Specifically, one end of the vertical jack 7 is connected to the top of the shear box upper box 4 in the shear box assembly, and a vertical dynamometer 5 is provided in the vertical jack 7, and the vertical dynamometer 5 measures the vertical force.

[0052] Specifically, a vertical displacement dial gauge 6 is provided on the top of the shear box upper box 4, and the vertical displacement dial gauge 6 measures the vertical displacement.

[0053] Specifically, an upper force transmission plate 8 is provided at the upper end of the shear box upper box 4 , and the vertical jack 7 is connected to the upper force transmission plate 8 .

[0054] Correspondingly, a lower force transmission plate 9 is provided at the lower end of the shear box lower box 13 , and the lower force transmission plate 9 is connected to the lower reaction frame 17 .

[0055] Specifically, the transverse connection assembly is a transverse tie rod 19, and the transverse tie rod 19 connects the horizontal reaction beam 12 and the shear box assembly.

[0056] More specifically, one end of the transverse tie rods 19 is connected to the horizontal reaction beam 12, and the transverse tie rods 19 are divided into two groups. The other end of one group of transverse tie rods 19 is connected to the side wall of the shear box upper box 4, and the other end of the other group of transverse tie rods 19 is connected to the shear box lower box 13.

[0057] Specifically, by analyzing the stress nature of the sample soil during the test, the utility model can also adopt the stress form of the upper part of the sample, that is, the upper force transfer plate 8 and the lower force transfer plate 9 are used for sealing, and the soil is completely loaded into the shear box.

[0058] At the same time, the force transmission beam connected by tie rods between the upper force transmission plate 8 and the lower force transmission plate 9 can achieve the purpose of providing vertical reaction force.

[0059] The utility model upgrades and transforms the traditional three-box direct shear instrument so that the instrument can provide horizontal and vertical reaction forces by itself, thereby avoiding heap loading or ground anchoring during the test.

[0060] Compared with the common three-box in-situ direct shear apparatus which adopts the method of weight, stacking platform or ground anchor to provide vertical reaction force, the utility model can provide vertical reaction force by its own force transmission system, which has the effect of saving manpower and material resources during the test and saving the test time.

Claims

1. A three-box full self-reaction in-situ direct shear test device, comprising a lower reaction frame (17) as a bottom foundation, characterized in that: A vertical connection assembly is arranged on the lower reaction frame (17), an upper reaction beam (15) is arranged at the upper end of the vertical connection assembly, a test space is formed between the lower reaction frame (17) and the upper reaction beam (15), a shear box assembly is arranged in the test space, and a vertical reaction assembly for providing a vertical reaction force is arranged between the upper reaction beam (15) and the shear box assembly.

2. A three-box full self-reaction in-situ direct shear test device according to claim 1, characterized in that: A vertically arranged horizontal reaction beam (12) is also provided in the test space, and a horizontal reaction component for providing a horizontal reaction force is provided on one side of the horizontal reaction beam (12) facing the shear box component.

3. A three-box full self-reaction in-situ direct shear test device according to claim 1, characterized in that: The upper reaction beam (15) is arranged horizontally, and the lower reaction frame (17) and the upper reaction beam (15) are parallel.

4. A three-box full self-reaction in-situ direct shear test device according to claim 1, characterized in that: The vertical connection assembly comprises a vertical tie rod (16), and the vertical tie rod (16) supports the upper reaction beam (15).

5. A three-box full self-reaction in-situ direct shear test device according to claim 4, characterized in that: The vertical tie rods (16) are divided into at least two groups, and the two groups of vertical tie rods (16) are located on the left and right sides of the shear box assembly.

6. The three-box full self-reaction in-situ direct shear test device according to claim 1, characterized in that: The vertical reaction force assembly is a vertical jack (7), one end of the vertical jack (7) is connected to the lower end of the upper reaction force beam (15), and the other end is connected to the top of the shear box assembly.

7. The three-box full self-reaction in-situ direct shear test device according to claim 2, characterized in that: The horizontal reaction force assembly is a horizontal jack (11), one end of the horizontal jack (11) is connected to the side wall of the shear box assembly, and the other end is connected to the horizontal reaction force beam (12).

8. The three-box full self-reaction in-situ direct shear test device according to claim 1, characterized in that: A receiving cavity is formed in the shear box assembly, and a test soil body is received in the receiving cavity.

9. The three-box full self-reaction in-situ direct shear test device according to claim 7, characterized in that: A transverse connection component is provided between the horizontal reaction beam (12) and the shear box component.

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