Long-term bearing test monitoring device for large-size cuboid coal and rock sample

Abstract

The invention discloses a long-term bearing test monitoring device for a large-size cuboid coal and rock sample, and relates to the technical field of rock mechanics tests. The long-term bearing test monitoring device comprises an upper pressing plate, a bottom plate, a lateral confinement restraining plate, an upper stress sensor locating plate, a bottom stress sensor locating plate, a lateral stress sensor locating plate and a displacement sensor locating plate. A space which is formed by the upper pressing plate, the bottom plate and the lateral confinement restraining plate and is approximately in a hexahedron shape is designed for monitoring the coal and rock sample to be tested. Stress sensors are arranged on the inner side face of the upper pressing plate, the inner side face of the bottom plate and the inner side face of the lateral confinement restraining plate respectively, displacement sensors are symmetrically arranged on the front side face and the rear side face of the whole device, the stress changes of different points of all non-free faces of the large-size cuboid coal and rock sample and the transverse deformation condition of different points of all free faces under long-term bearing are accurately tested, and then the mechanics characteristics and failure mode of the large-size cuboid coal and rock sample in the long-term bearing process are analyzed. High practicality is achieved.

Description

technical field [0001] The invention relates to the technical field of rock mechanics tests, in particular to a long-term bearing test monitoring device for large-size cuboid coal rock samples. Background technique [0002] Strip mining is a commonly used coal mining method. Only part of the coal in the coal seam is mined, and the remaining coal supports the overlying strata in the form of strip coal pillars, which can effectively inhibit the subsidence of the overlying strata in the stope and the surface Mobile, thereby protecting the ground ecological environment and facilities such as buildings and railways. Ensuring the long-term stability of striped coal pillars is beneficial to the safe production and economic development of mines, so it is necessary to study the mechanical properties and instability mechanism of striped coal pillars under long-term load. It is one of the important methods to study the instability mechanism of striped coal pillars by using large-size ...

AI Technical Summary

Problems solved by technology

However, there is currently no feasible monitoring technology and a complete monitoring system to assist in completing the test.

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