Simulation research experimental device and experimental method for spallation failure generated after pressure relief of gas-containing coal body

Abstract

The invention discloses a simulation research experimental device and experimental method for spallation failure generated after pressure relief of a gas-containing coal body, which have the benefitsthat the loading and the molding of the granular coal body in the experimental device can be satisfied, that the coal body can bear a higher stress load before pressure relief is ensured, and the experimental operation requirements for sudden pressure relief withdrawal are met; through a current-limiting orifice plate, the control and the adjustment on the pressure drop rate of a pressure relief boundary can be realized, controllable variables of the device are increased, and the analysis and the research on flow field evolution rules and failure characteristics after pressure relief are morefacilitated; a high-strength transparent material is embedded in a tubular cylinder, and a high-speed camera is matched, so that the visual monitoring of the experimental process is realized, and a more intuitive experimental support is provided for spallation failure and propulsion process analysis and occurrence mechanism exploration; pressure sensors are mounted in multiple positions in the flow field direction, so that the real-time dynamic monitoring of pore pressure distribution and variation in the gas flow process can be realized, and a more abundant intuitive data is provided for analysis on the flow field evolution rules.

Description

Technical field [0001] The invention belongs to the technical field of coal and gas outburst and coal body failure process simulation experiments after sudden pressure relief, and specifically relates to a process of spalling failure occurring under the action of sudden stress unloading and gas seepage for porous media such as coal and rock under loaded conditions The simulated experimental device and related experimental methods. Background technique [0002] my country’s coal and gas outburst disasters are serious, the mechanism of outburst occurrence is complex and a consensus conclusion has not yet been formed, which is the root cause of frequent outburst accidents and difficult to effectively control. Spall failure is a typical failure form of gas-containing coal after decompression, and exploring the mechanical mechanism of its occurrence is of great significance for further revealing the occurrence mechanism of coal and gas outburst and guiding the prevention and control o...

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Problems solved by technology

[0003] However, there are few reports on the research and development of the simulation experimental device for the occurrence of spalling in gas-containing coal bodies after pressure relief.

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