Apparatus and method for identifying outburst proneness of gas-containing coal seam

Abstract

An apparatus for identifying outburst proneness of a gas-containing coal seam comprises an upper pad, a lower pad, permeation plates, a clamping mechanism, a vacuum extraction system and a gas injection system; the upper pad includes a vacuum extraction through hole; the lower pad comprises a gas injection through hole; the permeation plates each comprise a through hole connection, a communicating groove and a permeation hole; the clamping mechanism includes a left piece and a right piece that are in semicircular groove shape; upon the injection of gas in a coal sample, the upper pad and the lower pad clamp the coal sample from top and bottom through the permeation plates, the coal sample is radially clamped via the clamping mechanism, the coal sample is in a closed chamber, the upper pad is communicated with the vacuum extraction system to abstract the air in the coal sample, and the lower pad is then communicated with the gas injection system to inject gas into the coal sample. The apparatus enables a gas-containing coal sample to be acquired, impact index values of the gas-containing coal sample are effectively measured, and scientific basis is provided for the accurate assessment of the impact effect of gas upon a coal sample.

Description

technical field [0001] The invention relates to a gas-containing coal seam impact tendency identification device. Background technique [0002] With the increase of mining depth, the coal seam is faced with the effects of high gas, high geostress, and high karst water pressure. At the same time, the stress field of the coal seam is extremely complex and affected by repeated disturbances during the mining process, and rock burst is prone to occur. Deep coal seams have high ground temperature and high degree of metamorphism during the coal formation process, and the coal body has a strong ability to absorb gas. In addition to the impact of gas on outburst, the impact of gas on coal seam rockburst should also be considered during mining. Free gas will produce mechanical effects on the tips of micro-cracks and micro-pores in coal, which will affect the stability of coal seam; while adsorbed gas will often change the surface free energy of coal by affecting the non-mechanical pro...

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Problems solved by technology

[0004] However, since the gas in the coal sample has been desorbed and released during sampling, processing and laboratory tests, and the gas pressure has no effect on the indoor measurement, the identification of impact tendency at this stage does not consider the impact tendency of gas to coal under the original conditions. At present, there is no identification device and method suitable for the impact tendency of gas-bearing coal seams, especially high-gas coal seams.

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