New ball-type single-shear experimental device for anchor rods and anchor cables

Abstract

The invention discloses a new ball-type single-shear experimental device for anchor rods and anchor cables, and the device comprises upper and lower shear devices, left and right fixed cylinders, front and rear fixed guide grooves, and samples, wherein the shear devices comprise a loading flat plate, a fixed support plate, a vertical guide rail plate and a hollow shear ball table; the fixed cylinders comprise a long hollow cylinder and a hollow ball table coupled with one side of the hollow shear ball table; the fixed guide grooves comprise a concave steel block with three bolt holes; the samples comprise a left and right symmetric long cylinder, a middle spherical protrusion, and anchor rods or anchor cables built in the centers of the long cylinder and the middle spherical protrusion. The new ball-type single-shear experimental device has a simple structure, is easy to operate and convenient to control variables by loading through a common uniaxial compression tester, can achieve theshearing at any space angle with the shearing surface, overcomes the defect that the traditional single-shear experiment for anchor rods cannot change the installation angle, and increases the sheararea at the same time, thereby not only adapting to the conditions of large shear displacement, but also considering the impact of the shear surface on shear engineering.

Description

technical field [0001] The invention discloses a novel anchor rod and anchor cable ball-type single-shear experimental device, which is especially suitable for safety detection and indoor experiment testing of anchor rod and anchor cable support in high-stress and large-deformation joint rock masses in deep mines. Background technique [0002] Anchor bolts and cables are the main supporting elements in modern geotechnical engineering stabilization technology, and are widely used in underground excavation and open slopes in geotechnical and mining engineering. The anchorage mechanical properties of anchor rod and anchor cable are the basic parameters of support engineering design. The bolt can not only significantly enhance the tensile properties of the surrounding rock, but also effectively resist the shear failure in the weak structural plane and potential sliding plane in the rock mass. In deep high-stress and large-deformation jointed rock mass, bolts may be partially br...

AI Technical Summary

Problems solved by technology

Especially in actual engineering, most of them use the empirical method to estimate the shear strength based on the tensile strength of the anchor for design and construction. One of the most important factors is the shear performance of the anchor. There are no precise quantitative studies

Because it is difficult to conduct shear tests on the engineering site, researchers at home and abroad have designed a variety of test instruments, mainly including single-shear and double-shear, but both have certain limitations, such as complex structures, large specimens, no Considering the installation angle of the anchor rod, not considering the roughness of the joint surface, etc.

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