Direct shear tester for testing strength of slip band and direct shear test method

A direct shear tester, strength testing technology, applied in strength characteristics, using stable shear force to test material strength, instruments, etc., can solve limited shear distance, difficult residual strength test, shear surface shear stress and uneven strain distribution to achieve continuity and reduce manufacturing costs

Active Publication Date: 2021-07-20
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are following defects in the existing test instrument for implementing the above-mentioned sliding band strength testing method: (1) direct shear instrument has limited shear distance during shear test, thereby being difficult to carry out the test of residual strength; (2) ring shear instrument although Unlimited ultra-long-distance shearing can be carried out in one direction, but its structural characteristics determine the uneven distribution of shear stress and strain along the radial direction of the shear surface, and the small size of the ring shear device

Method used

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  • Direct shear tester for testing strength of slip band and direct shear test method
  • Direct shear tester for testing strength of slip band and direct shear test method
  • Direct shear tester for testing strength of slip band and direct shear test method

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Embodiment 1

[0045] An embodiment of the present invention provides a sliding belt strength testing direct shear tester 100, which can be used for testing the strength of sliding belts of various structures. see Figure 1 to Figure 3 , the sliding belt strength testing direct shear tester 100 includes a shear box 10, a horizontal loading system 20, a normal loading system 30 and a measurement system. Wherein the shearing box 10 comprises a lower shearing box 11 and an upper shearing box 12, there is a shear seam between the lower shearing box 11 and the upper shearing box 12, and the opening area of ​​the lower shearing box 11 is greater than the upper shearing box The opening area of ​​12; the horizontal loading system 20 and the normal loading system 30 respectively act on the lower shear box 11 and the upper shear box 12 to carry out horizontal loading and normal loading respectively; the measurement system is used to obtain the Test data, including but not limited to horizontal stress...

Embodiment 2

[0067] Based on the same inventive concept, this embodiment provides a direct shear test method for testing the strength of a sliding belt, which is implemented based on the direct shear tester 100 for testing the strength of a sliding belt in the first embodiment. In this embodiment, the sliding belt in the form of gravel soil-bedrock structure is used as the test object, and the sliding surface of the gravel soil-bedrock sliding belt is the gravel soil-bedrock interface. see Figure 9 , the method specifically includes the following steps:

[0068] S1: Put the gravel soil-bedrock original sample in the shear box 10, adjust the normal position of the gravel soil-bedrock original sample, so that the gravel soil-bedrock original sample - The bedrock interface is flush with the top surface of the lower shear box 11 .

[0069] Specifically, push the shear box 10 out of the normal loading system 30 as a whole along the guide rail 16, and put in the shear box 10 the gravel soil-b...

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Abstract

The invention discloses a direct shear tester for testing the strength of a slip band and a direct shear test method, and solves the technical problem that the residual strength of the slip band of a large-size geotechnical material is difficult to obtain by the existing tester and test method. The direct shear tester comprises shear boxes, a horizontal loading system, a normal loading system and a measuring system, wherein the opening area of the lower shear box is larger than that of the upper shear box, and the normal loading system adopts a mechanical lever principle to load normal stress on multiple amplification effects of force. The normal loading system specifically comprises n stages of amplification lever groups, the n stages of amplification lever groups comprise n amplification lever mechanisms with the ratio of power arms to resisting arms being greater than 1, and the resisting arm of the ith stage of amplification lever mechanism acts on the power arm of the (i+1)th stage of amplification lever mechanism, so that step-by-step amplification of the load can be realized; a power arm and/or a resisting arm of at least one amplification lever mechanism in the n stages of amplification lever sets can be adjusted, and continuous loading of normal force can be achieved.

Description

technical field [0001] The application belongs to the technical field of geotechnical tests, and in particular relates to a direct shear tester for testing the strength of a sliding belt and a direct shear test method. Background technique [0002] Accumulative landslides refer to a typical type of landslides where Quaternary and modern loose accumulations are unstable, and are widely distributed in the Three Gorges Reservoir area and Southwest provinces in my country. Taking the Three Gorges Reservoir area in eastern Chongqing and western Hubei as an example, among all types of landslides, accumulative layer landslides account for a large proportion. Only accumulative layer landslides accounted for 80%. [0003] Accumulative landslides have special material composition and structural characteristics. Taking reservoir accumulative landslides as an example, it usually shows that the upper landslide loose rock and soil slides along the underlying bedrock interface, and the de...

Claims

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Application Information

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IPC IPC(8): G01N3/24G01N3/02
CPCG01N3/24G01N3/02G01N2203/0003G01N2203/0025G01N2203/0282Y02A10/23
Inventor 黄磊李应唐辉明范志强张俊荣
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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