Device and method for measuring prediction index critical value of coal and gas outburst

Abstract

The invention discloses a device and a method for measuring a prediction index critical value of coal and gas outburst. The device mainly comprises a pressure loading device, a gas loading device, an outburst starting device, an observation device and a data acquisition and analysis device. Deformation and damage conditions of a coal body and a coal sample in the outburst experiment process is observed and recorded by simulating ground stress of an experiment mine; and pressure, temperatures, acoustic emission, electric potentials, electromagnetic radiation signals and variation conditions in the experiment process are acquired through data acquisition and analysis. Differences of gas bearing conditions, the ground stress and the mechanical property of the coal body in the mine are comprehensively taken into consideration, and experiments are performed according to actual conditions of all mines to determine the prediction index critical value of the coal and gas outburst; specific conditions of the experiment mine can be actually reflected by the acquired experiment parameters and results; compared with a unified index critical value, the determined prediction critical value of the coal and gas outburst is more scientific; and the device has a compact structure and low manufacturing cost, the method is simple, and the device and the method are easy to operate and high in reliability.

Description

technical field [0001] The invention relates to a coal and gas outburst measuring device and method, in particular to a coal and gas outburst predictive critical value measuring device and method suitable for determining outburst parameters and critical values. Background technique [0002] Coal and gas outburst is a dynamic phenomenon in mines, the mechanism of which is relatively complex, and the outburst elements are mutually restricted. People have carried out a lot of research on the prediction of coal and gas outburst, but under the current conditions, there are mainly the following methods to determine the critical value of the gas pressure index used to identify whether there is a risk of outburst in the coal seam: [0003] In the "Regulations on the Prevention and Control of Coal and Gas Outburst", the gas pressure of 0.74MPa is used as the critical value of gas pressure for judging whether there is a danger of outburst. Since the three major factors affecting coal...

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Problems solved by technology

Limited by the experimental device, the experimental device has a small capacity for in-situ stress loading, and cannot simulate the in-situ stress conditions of mines of different degrees, and the number of experiments is limited. Only the range of the gas pressure critical value has been obtained, and no further results have been obtained. exact value

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