Constant-volume gas-bearing coal gas-solid coupling physical and mechanical parameter testing device and testing method

Abstract

The invention discloses a constant-volume gas-bearing coal gas-solid coupling physical and mechanical parameter testing device and a testing method. The testing device comprises a visualized loading system for quantitatively inflating a test piece, triaxially loading and unloading and visually monitoring the whole process in real time, a constant volume system for realizing constant volume in an axial pressurizing process, and a normal-pressure visualized gas volume measurement system for quantitatively unloading the confining pressure and visually monitoring the adsorption and desorption process of the test piece. The testing device has the beneficial effects that an adsorption and desorption channel of the axis of a pressurized head can be used for measuring the adsorption and desorption mount of the test piece to gas, the constant volume system can realize the constant volume in the axial pressurizing process to eliminate the interference of pressure intensity change to the testing process, the normal-pressure visualized gas volume measurement system adopts the theory of communicating vessels and a quantitative drainage method to transform colourless and invisible gas to a normal pressure state, therefore, the visualized observation and real-time data acquisition can be realized during testing.

Description

technical field [0001] The invention belongs to the field of mining engineering and geotechnical engineering scientific research technology, and particularly relates to the research and disclosure of the adsorption and desorption laws of gas-containing coal bodies under different loads and gas pressure conditions, the variation laws of gas-containing coal bodies in different loading stages, and the mechanism of damage expansion and failure The test device and test method. Background technique [0002] Gas accidents are very harmful, especially coal and gas outbursts have become a major problem that plagues the safety of coal mines in my country. However, the mechanism of coal and gas outbursts caused by the damage and expansion of gas-containing coal and the rapid desorption and release of gas is still unclear. According to the hypothesis of comprehensive action of coal and gas outburst: coal and gas outburst is the result of comprehensive action of ground stress, gas pressu...

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Problems solved by technology

[0010] 1. Regardless of the size of the above-mentioned test device, it cannot solve the objective interference problem of the test caused by the change of the gas pressure in the test space caused by the change of the volume of the loading chamber during the loading process;

[0011] 2. The operation of the above-mentioned test device is complicated, the function is single, and most of them can only observe the damage phenomenon qualitatively, it is difficult to realize the visual real-time monitoring of the test process

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