Micro-seismic response coal and gas outburst self-trigger simulation experiment device

Abstract

The invention relates to a micro-seismic response coal and gas outburst self-trigger simulation experiment device. The device comprises a closed outburst cavity composed of a rear end plate, a cylindrical outer plate and a pressure loading movable piston together, a gas pressure sensor and a stress sensor are arranged in a hole of the cylindrical outer plate, an outburst opening is formed in the rear end plate, special sealing materials are arranged in the outburst opening and in the cylindrical outer plate for sealing, the materials are good in rheological property and can automatically trigger coal and gas outburst, and a micro-seismic monitoring device is arranged outside the cavity to capture the foreboding information of coal and gas outburst. According to the device, loads or gas pressure is increased on coal samples in the outburst cavity continuously so as to induce the coal samples in the outburst cavity to automatically trigger the outburst from the outburst opening, features of the coal and gas outburst excitation stage are recorded in detail, changes of coal sample stress fields and gas fields in the coal and gas outburst excitation stage are visually reflected, and solid theoretical bases are provided for reasonable and scientific prediction in selection and production processes.

Description

technical field [0001] The present invention relates to a simulation experiment device for capturing coal and gas outburst experiment and outburst excitation stage information, specifically related to the simulation experiment for coal and gas outburst under different gas pressure and different stress conditions, and different gas pressure and different stress conditions Capturing information of coal and gas outburst excitation stage. Background technique [0002] The comprehensive action hypothesis to explain the mechanism of coal and gas outburst has been accepted by many scholars, who believe that the driving force of coal and gas outburst is gas pressure and stress, and the resistance of outburst is the strength of coal body. But so far, the mechanism of how gas pressure, stress and coal mechanical properties stimulate coal and gas outburst has not been identified. Some scholars in the former Soviet Union, Japan and my country have successively designed and manufactured ...

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Problems solved by technology

But so far, the mechanism of how gas pressure, stress and coal mechanical properties stimulate coal and gas outburst has not been identified. Some scholars in the former Soviet Union, Japan and my country have successively designed and manufactured some equipment or devices for The simulation and experiment of coal and gas outburst, these equipment or devices have played a certain role in the study of coal and gas outburst occurrence stage, for example, the China University of Mining and Technology has studied the temperature change in the outburst process through the coal and gas outburst device, it is considered that the stress The release of elastic energy by crushing coal leads to temperature changes in the outburst process; Jiaozuo Institute of Technology has studied the temperature changes in the outburst process through coal and gas outburst installations, and believes that the expansion and work process of gas is a multi-dimensional process that is close to an isothermal process. change process

Chongqing University, Chongqing Research Institute, Institute of Mechanics, Chinese Academy of Sciences, Liaoning University of Engineering Technology, etc. have studied the process of coal and gas outburst under different strength coal bodies, triaxial stress, and different gas pressure conditions through coal and gas outburst simulation. Although the research progress of coal and gas outburst mechanism has been promoted to a certain extent, most of them only simulate the outburst process, and there are few researches on the rheology of coal body under the action of gas pressure and in-situ stress in the coal and gas outburst excitation stage. Less information about outburst precursors captured in coal and gas outburst simulation experiments through microseismic responses

In addition, the coal and gas outburst activation stage is a rheological process, but most simulators cannot simulate the rheological process of coal and gas outburst activation

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