Simulation test system of coal-gas outburst during rock cross-cut coal uncovering

Abstract

The invention discloses a simulation test system of coal-gas outburst during rock cross-cut coal uncovering, comprising a box provided with an opening at the top thereof, wherein the opening is equipped with a loading steel plate; a top plate and a bottom plate are paved in a closed cavity; a coal layer is paved between the top plate and the bottom plate; a slant angle is formed between the coal layer and the horizontal plane; an outburst simulation roadway is stretched in the bottom plate till being intersected with the coal layer; a notch attached to the coal layer is arranged at the intersection of the outburst simulation roadway; a diaphragm is arranged at the notch; an outburst opening and a gas balance opening are arranged at a part of outburst simulation roadway, which is exposed out of the box; the outburst opening is provided with a quick-opening seal structure; the gas balance opening is communicated with an air pressure tank; surface inflatable structures are respectively arranged on the contact surface of the coal layer and the top plate as well as the contact surface of the coal layer and the bottom plate; and the surface inflatable structures are communicated with a gas pressure tank. According to the invention, a mechanical release-diaphragm rupture method is adopted to ensure that the whole-process simulation of the coal-gas outburst during the rock cross-cut coal uncovering is realized.

Description

technical field [0001] The invention relates to a coal and gas outburst simulation test system when coal is uncovered in Shimen. Background technique [0002] Coal and gas outburst accidents refer to the abnormal dynamic phenomenon that broken coal and gas are suddenly thrown from the coal body or rock body to the mining space under the joint action of in-situ stress and gas during the coal mining process, manifested as several tons Thousands of tons or even tens of thousands of tons of broken coal rocks are thrown from the coal rock mass to the mining space within a few seconds to tens of seconds, accompanied by a large amount of gas gushing out, causing serious harm. [0003] In the study of coal and gas outburst mechanism, the comprehensive effect hypothesis is generally accepted. This hypothesis believes that coal and gas outburst is the result of the combined effect of in-situ stress, gas pressure and coal mechanical properties. The mechanism of action in this hypothes...

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Problems solved by technology

Because coal and gas outbursts are extremely disastrous, it is impossible to carry out real-time tracking research when coal and gas outburst disasters occur on site. We can only rely on laboratories for experimental simulations. Relevant scientific research institutions at home and abroad have carried out a large number of coal and gas outbursts. Similar to the simulation experiment research work, a series of coal and gas outburst simulation experimental devices have been developed, which has deepened the research progress of coal and gas outburst to a certain extent, but there are still some deficiencies, mainly as follows: (1) the existing outburst simulation The size of the model used in the experimental device is small, and the simulated experimental outburst coal samples do not consider the influence of the coal seam roof and floor on the outburst coal seam; (2) the existing outburst simulation test device does not have the gas pressure of the outburst roadway before and after the outburst process. (3) The thickness of the outburst coal seam of the existing outburst simulation test device is small, which will cause the changes in the coal seam stress and gas pressure during the outburst process cannot be fully reflected; (4) The existing outburst simulation test device The sudden release of gas pressure cannot be realized, which reduces the authenticity of its simulation test

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