The Study On The Mechanism Of The Outburst Of Coal And Gas In The Process Of Drivage

The outburst of coal and gas is a kind of complicated dynamic phenomenon, so the current thesis is started from the viewpoint of "force", and the outburst of coal and gas is studied in-depth in the method of numerical simulation. It is pointed out that the outburst of coal and gas is resulted in the integrative effect of mechanics intensity of coal, geostress, and pressure of gas. The essential of outburst of coal and gas is a continuous developing process that the coal is destroyed by geostress, and gas is released from coal and expand the crannies in the coal and ultimately tears the coal shell formed just now and makes it unbalanced and destroyed it, so the coal, whose surface is break and has supporting effect originally, is torn into chips and threw them into roadway, and peak stress moves to the interior of coal and continue to destroy the subsequent coal.The stress distributing regularity of surrounding coal and rock of roadway, especially ahead of the excavation head, is depicted, after the numerical simulation and analysis by ANSYS; a SPH preprocessor software aimed at complicated roadway is programmed, and after the numerical simulation by LS-DYNA, which is a kind of numerical simulation software, the whole process of outburst of coal and gas reappears. The stress and movement regularity of coal particles thrown into roadway in the process of outburst is pointed out in current thesis, and the "spherical shell destabilization" theory is verified. At the same time, how and what the main factors on-site affect the outburst of coal and gas is systematically analyzed in detail.