Low-normal-friction split mounting type shear box for circular shearing of rock mass structural surface

A shear box, assembled technology, applied in the field of geotechnical engineering, can solve the problems of the normal direction displacement of the cyclic tensile and compressive load sample being difficult to deform freely, so as to reduce the normal deformation resistance and friction, reduce the normal friction, The effect of easy installation

Active Publication Date: 2022-01-11
济南矿岩试验仪器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problems that it is difficult to apply cyclic tensile and compressive loads and the displacement in the normal direction of the sample is difficult to deform freely during the indoor shear experiment, and provides a low-pressure cyclic shearing method for rock mass structural planes. Assembled shear box with normal friction resistance to meet the requirements of shear chamber mechanical test

Method used

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  • Low-normal-friction split mounting type shear box for circular shearing of rock mass structural surface
  • Low-normal-friction split mounting type shear box for circular shearing of rock mass structural surface
  • Low-normal-friction split mounting type shear box for circular shearing of rock mass structural surface

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Effect test

Embodiment

[0033] Such as Figure 1-9 As shown, a low normal friction assembled shear box for cyclic shearing of rock mass structural surfaces is mainly composed of a pull shaft 1, a locking sleeve 2, a high-strength fastening screw 3, a limit screw 4, and a groove Guide rail 5, slider 6, airfoil plate 7, high-strength connecting screw 8, connecting plate 9, upper flap 10, bolt 11, fastener 12, lower flap 13, nut 14, stepped stud 15, groove 16 , ball 17, connecting screw 18, and chute 19 are formed;

[0034] The section of pull shaft 1 is T-shaped, its vertical section is a cylinder, and the end of the cylinder is an external thread. The shear box is connected to the fixed end of the shearing instrument through pull shaft 1; the locking sleeve 2 is set on the cylinder of pull shaft 1 , after the shear box is rotated and adjusted to the level, the shear box and the shearer are locked by rotating the locking sleeve 2 to ensure that they are tightly fitted and withstand horizontal tensile ...

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Abstract

The invention belongs to the technical field of geotechnical engineering, and discloses a low-normal-friction split mounting type shear box for circular shearing of a rock mass structural surface. When cyclic tension-compression shear load is applied, the step stud connected with the shear loading end transmits the tension-compression load of the lower half part, and the fixed end pull shaft connected with the shear apparatus fixed end transmits the tension-compression load of the upper half part. When the sample generates normal displacement due to shear expansion or shear shrinkage, the sample drives the sliding block to freely move up and down along the groove guide rail, and the ball between the sliding block and the guide rail reduces friction and experimental errors of the sample in the normal direction. The low-normal-friction split mounting type shear box can meet cyclic compression and tensile stress application in a shear experiment, reduces normal friction, improves experiment precision, is simple in equipment structure, easy to disassemble and convenient to install, and has good adaptability, and for a sample with a certain size error, the close attachment of the shear box and the sample can be ensured by adjusting the position of the fastening block.

Description

technical field [0001] The invention relates to an assembled shear box, in particular to a low normal friction assembled shear box used for cyclic shearing of rock mass structural surfaces, and belongs to the technical field of geotechnical engineering. Background technique [0002] There are generally weak structural planes such as joints, cracks, and weak layers in the rock mass of underground engineering. These structural planes control the strength and stability of the rock mass and are crucial to engineering safety. Under the conditions of earthquake load, periodic storage and drainage of reservoirs, or coal seam mining, the rock mass is affected by cyclic shear loads along the structural plane, which further weakens the mechanical strength of the rock mass. Therefore, it is of great significance for the guidance of engineering safety analysis to conduct cyclic shearing on the rock mass structural plane at the laboratory scale to explore its failure mechanism and failur...

Claims

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Application Information

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IPC IPC(8): G01N3/32
CPCG01N3/32G01N2203/0005G01N2203/0025G01N2203/0423Y02E10/20
Inventor 李迎春付斌唐春安马天辉
Owner 济南矿岩试验仪器有限公司
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