Testing system for evolution process of deep mining stress field

Abstract

The invention discloses a testing system for an evolution process of a deep mining stress field, and belongs to the field of testing systems for the stress evolution of working faces. The system can perform non-uniform dynamic loading on large coal according to mechanical conditions of the coal and really simulate the mechanical conditions of the coal in elastic and plastic states, and comprises a test loading component, a servo component, a control component and an acoustic wave monitoring component, wherein the test loading component comprises a coal sample, a main loading frame, two side pressure loading units and an axial pressure loading unit; the axial pressure loading unit is provided with five independent loading points; the two side pressure loading units are arranged on the two sides of left and right upright posts; the side pressure loading unit on each side is provided with three independent loading points, and different loads can be loaded by adjusting the loading points above a top plate and the loading points on the left and right sides to realize the non-uniform loading of the coal.

Description

technical field [0001] The invention belongs to the field of stope stress evolution test system, and in particular relates to a test system for the evolution process of mining stress field in deep mining. Background technique [0002] In recent years, my country's coal mining has extended to the deep at a rate of about 10m per year. In the next 10 years, a considerable number of mines in my country will enter deep mining. Deep mining is different from shallow mining. The mechanical properties of coal and rock change under the action of high temperature and high ground stress, which makes the mechanical environment of coal mining, the organizational structure of coal and rock mass, basic mechanical behavior and engineering response significantly different from shallow mining. At the same time, the large-space mining mode leads to more complex spatio-temporal relationships and dynamic characteristics of the mining stress field, and is more likely to induce dynamic disasters su...

AI Technical Summary

Problems solved by technology

Deep mining is different from shallow mining. The mechanical properties of coal and rock change under the action of high temperature and high ground stress, which makes the mechanical environment of coal mining, the organizational structure of coal and rock mass, basic mechanical behavior and engineering response significantly different from shallow mining. At the same time, the large-space mining mode leads to more complex spatio-temporal relationships and dynamic characteristics of the mining stress field, and is more likely to induce dynamic disasters such as rock bursts and coal and gas outbursts, causing serious damage and a large number of casualties. Fully grasp the spatio-temporal evolution of the mining stress field distribution under different mining conditions, and the faults caused by excavating, maintaining roadways and advancing the working face at the wrong time and space

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