Direct shear test device using triaxial compression tester for loading and direct shear test method

A technology of triaxial compression and test device, which is applied in the direction of applying stable shear force to test the strength of materials, can solve the problems of strict sample processing and operation requirements, increase the test cost, etc., to save the test cost, the method is reliable, the Install simple effects

Active Publication Date: 2017-05-10
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, although there are many types of direct shear instruments currently used for single-sided direct shear tests, the existing direct shear

Method used

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  • Direct shear test device using triaxial compression tester for loading and direct shear test method
  • Direct shear test device using triaxial compression tester for loading and direct shear test method
  • Direct shear test device using triaxial compression tester for loading and direct shear test method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1:

[0028] See figure 1 , A direct shear test device loaded by a triaxial compression tester, including a shear ring 1, a shear table 3 and a heat shrink tube 5.

[0029] The upper surface of the shear ring 1 is flat, with a central hole 10 in the center. The central hole 10 is a blind hole. The lower surface of the shear ring 1 is in contact with the indenter I6 of the testing machine.

[0030] The cutting table 3 is located above the cutting ring 1. The shearing table 3 is a variable-diameter cylinder, from top to bottom: the upper cylinder 9 of the shearing table, the body cylinder 30 of the shearing table, and the upper cylinder 9 of the shearing table. The shearing table is a rigid variable-diameter cylinder, the middle large cylinder has a diameter of L, and both sides have a small cylinder with a diameter of d. The upper cylinder is in contact with the indenter of the testing machine and bears pressure. Empty the wrapping space for the shrink film. The low...

Example Embodiment

[0035] Example 2

[0036] This embodiment uses the device described in embodiment 1 to disclose an indoor direct shear test method, which includes the following steps:

[0037] 1) Process sample 2 with height h and diameter D. The diameter of sample 2 is the same as the outer diameter of shear ring 1 and limit ring 3.

[0038] 2) After the sample processing is completed, assemble the shear ring 1, the sample 2, the shear table 3 and the limit ring 4, put the heat shrinkable tube 5 inside the assembly body, and use a hot air blower to heat the heat shrinkable tube to make it tightly close Attached to the surface of the device.

[0039] 3) Place the entire device (shearing ring, shearing table, limit ring, heat shrinkable tube, etc.), and the sample on the platform of the triaxial testing machine, apply the confining pressure to the set value σ, and the sample is in static water horizontally State of stress.

[0040] 4) After the confining pressure reaches the set value σ, apply the ver...

Example Embodiment

[0043] Example 3

[0044] The main steps of this embodiment are the same as those of embodiment 2. In the test, firstly, the cylindrical plate-shaped marble sample 2 is processed, the sample diameter D is 200 mm, and the thickness h is 40 mm. Install shear ring 1, sample 2 and limit ring 4 in order. The inner diameter of shear ring 1 is 42mm, the outer diameter of shear ring 1 and limit ring 4 are both 200mm, and the inner diameter of limit ring 4 The cutting table 3 is aligned and installed in the limit ring 4, the diameter of the cylinder 30 of the cutting table body is 180 mm, and the diameter of the lower cylinder 8 is 40 mm. Put the heat shrink tube 5 on the outside of the device, use a hot air blower to heat the heat shrink tube 5 on the surface of the device; place the device on the lower head of the triaxial testing machine, set the parameters of the testing machine, and apply the confining pressure to 5MPa; apply From vertical load to sample failure, the peak load is 75...

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Abstract

The invention discloses a direct shear test device using a triaxial compression tester for loading and a direct shear test method. The direct shear test device comprises a shear ring, a test sample, a limiting ring, a shear platform and a heat-shrink tube. The direct shear test method involving the direct shear test device includes the steps of test sample processing, device assembly, load application and strength computation. After the test sample processing is completed during test, the test sample is disposed between the shear ring and the limiting ring, the shear platform is mounted, the device wrapped by the heat-shrink tube is placed on a triaxial compression tester, ambient pressure is applied to set normal stress, and vertical load is applied until the test sample is destroyed. Under the action of the vertical load of the triaxial compression tester, the shear platform moves up and down along the limiting ring to shear the test sample. Direct shear tests can be conducted on the common triaxial compression tester by the direct shear test device and the direct shear test method. The direct shear test device has the advantages of simplicity, convenience in operation, accurate testing results and capability of saving test costs substantially.

Description

technical field [0001] The invention relates to the field of rock and soil mechanics, in particular to a device and method for conducting indoor direct shear tests. Background technique [0002] Both engineering practice and laboratory tests have proved that shear failure is an important form of rock and soil failure, and the shear strength of rock and soil is related to the stability of rock and soil engineering such as slope engineering, foundation engineering, and retaining wall engineering. At present, the methods to determine the shear strength of rock and soil mainly include direct shear test, triaxial compression test, wedge shear test and other methods. Due to the ease of operation and simple loading, the direct shear test is still the most widely used method for determining the shear strength of rock and soil. [0003] In the prior art, there are three types of single-sided direct shear testers: ①The force transmission plate and the upper shear box function indepen...

Claims

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Application Information

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IPC IPC(8): G01N3/24
CPCG01N3/24
Inventor 黄达朱谭谭岑夺丰曾彬
Owner CHONGQING UNIV
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