Experimental method for evolution process of mining stress field in deep mining

Abstract

The invention discloses a test method for the evolution process of the mining stress field in deep mining, and belongs to the field of test methods for the stress evolution of the stope. This test method can carry out non-uniform dynamic loading of large-scale coal bodies according to the mechanical conditions of coal bodies, and truly simulate the mechanical conditions of coal bodies in elastic and plastic states. It first collects complete coal blocks on the working face to make large-scale coal bodies, then prepares and installs experimental hardware, which includes test loading components, servo components, control components and acoustic wave monitoring components, and puts the prepared large-scale coal bodies into the test In the loading main frame of the loading assembly, start the hydraulic servo assembly to control the loading cylinders in the lateral pressure loading unit and the axial pressure loading unit; after the large-scale coal body is loaded by each loading point, the force and deformation received are respectively passed through the pressure Sensors and displacement sensors are used for monitoring, and are transmitted to the control components through data lines, and the control components draw real-time test curves according to the requirements of the test personnel.

Description

technical field [0001] The invention belongs to the field of stope stress evolution test methods, in particular to a test method 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 such as rock ...

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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