Visualization test method for coal seam outburst caused by tunneling in working face

Abstract

The invention discloses a visual test method for coal seam outburst due to working face excavation. The visual test method includes the steps of making a test device including a sealed chamber in U shape and a transparent box, wherein a concave opening of the sealed chamber forms a test piece holding chamber, a front presser plate is provided with a front presser rod, three side presser plates arearranged on the left, right and rear of the test piece holding chamber respectively, the front end of each side pressure plate is provided with an air hole, each side presser plate is provided with aside presser rod, upper presser plates are arranged above an upper pad in front-rear adjacency manner, each upper presser plate is provided with an upper presser rod, the end of each upper presser rod is fitted with a spherical ball structure between wo clamp plates, the sidewall of the sealed chamber is provided with a fluid inlet, and the sidewall of the transparent box is provided with a fluidoutlet; preparing coal powder; preparing a coal briquette test piece; mounting the coal briquette test piece; applying triaxial stress; applying gas pressure; carrying out testing; changing applied triaxial stress or changing gas pressure for other tests in the same group; sorting test data. The visual test method can provide visual triaxial real simulation test for coal and gas outburst.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety, and in particular relates to a visualization test method for coal seam protrusion caused by excavation of a working face. Background technique [0002] Coal is the mainstay of my country's energy. It is clearly stated in the national "Energy Medium and Long-Term Development Plan (2004--2020)" that my country will "adhere to the energy strategy of taking coal as the main body, electricity as the center, and oil and gas and new energy development in an all-round way." ". Obviously, the coal industry is my country's basic industry, and whether it can develop healthily, stably, and sustainably is related to national energy security. In my country's primary energy consumption structure, coal accounts for about 67%, and it is estimated that it will still account for more than 50% in 2050. Therefore, coal will always be the dominant energy source in my country for a long period of time. [000...

AI Technical Summary

Problems solved by technology

However, there is still a lack of an effective test device and method to simulate the coal and gas outburst caused by the dynamic disturbance of coal seam during tunneling of the working face under the true triaxial stress state, so as to study the effects of various parameters on the coal during the tunneling process of the working face under the true triaxial stress state. Prominent impact with gas

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