Testing system and method for testing mechanical property of anchor rod or anchor cable anchoring interface in high-stress environment

Abstract

The invention discloses a testing system and method for testing the mechanical property of an anchor rod or anchor cable anchoring interface in a high-stress environment. The testing system comprises an anchor rod or anchor cable clamping mechanism for a test, the anchor rod or anchor cable clamping mechanism is installed at the upper end of a counterforce device, and automatic clamping and loosening of a to-be-tested anchoring body model, namely an anchor rod or an anchor cable can be achieved; and an annular high-pressure loading air bag is of an annular barrel structure, and a flexible constraint hoop is pasted to the inner wall of the annular high-pressure loading air bag, is composed of end arc sleeves, arc pressure springs, arc connection rods and arc force transferring plates and is of a barrel-shaped structure. Under the loading constraint action of the annular high-pressure loading air bag, the flexible constraint hoop can be shrunk inwards automatically, it is guaranteed that in the shrinking process, the cross section is always round, and loading of the stress of surrounding rocks uniformly distributed on the surface of the cylinder-shaped anchoring body model can be achieved. Through cooperation with a pneumatic oil tank pump, a high-pressure air pump and a controller, the mechanical property of the anchor rod or anchor cable anchoring body model interface can be effectively tested in different surrounding rock states and loading manners.

Description

technical field [0001] The invention relates to the field of underground engineering support material testing, in particular to a testing system and a method for testing the mechanical properties of anchor rods or anchor cables in high-stress environments. Background technique [0002] At present, with the rapid development of the national economy and the increasing demand for coal resources, the mining intensity of coal resources has increased year by year, and the shallow coal resources have basically tended to be exhausted. Most mines in my country have begun to show a development trend of "deep mining". When the mine mining exceeds a certain critical depth, affected by the deep "three highs and one disturbance" factor, the geomechanical environment of the surrounding rock is more complex and changeable, and the rock that shows the characteristics of hard rock in the shallow part will show soft rock The nonlinear failure characteristics of large deformation, large ground p...

AI Technical Summary

Problems solved by technology

However, this factor is seldom considered in the existing drawing tests, and the relevant experimental research results have never seen

In particular, people are generally accustomed to processing the anchor solid specimen composed of anchor (cable) rod body, anchoring agent and rock-soil body into a cylindrical model. If a traditional hydraulic cylinder is used with a rigid thruster, the It is difficult to apply radially uniform surrounding rock pressure, and special design of the oil cylinder structure is required to meet the requirements, and the contact area between the rigidly loaded thruster and the cylindrical anchor model specimen surface is also small due to the traditional hydraulic cylinder. Very limited, unable to guarantee the uniformity of the surrounding rock pressure distribution along the circumferential direction of the surface of the cylindrical model

Once the cylindrical anchor model is subjected to non-uniform loading pressure during the test process to produce asymmetric cracking or extrusion deformation, it will be difficult to ensure a circular cross-section of the anchor model, and thus cannot effectively simulate the stress of the surrounding rock uniformly distributed on the surface of the model. Reduce test precision

Images