Mechanism Of Coal And Gas Outburst With Microelement Destroying

Our country is a less oil and more coal, the coal industry is the country’s basic industries, which healthy, stable and sustainable development is related to national energy security. Within ten years since 2003, China’s coal and gas outburst accident occurred on 1224 times, caused more than 1,000 casualties. With the increase of the depth of mining, underground mining conditions are more complex, coal and gas outburst and more severe degree of risk.In this paper, the use of the basic physical properties of coal SEM, coal adsorption devices were studied experimentally, according to heterogeneity of coal, on the basis of the coal region of their outstanding mechanical properties, homogeneity, etc. Coal and gas micro unit divided into a number of different tiny cubes. Calculation of theoretical and numerical simulation method are used to analyze the initial conditions for the destruction of coal and gas micro unit, the stress distribution around after the destruction of the generated gas to produce damaging effects on the surrounding coal and energy coal and gas outburst conditions proposed based on coal and gas outburst mechanism micro unit damage. Finally, the point micro unit of coal and gas outburst mechanism of damage is described, and the use of the theory and principle of prominent phenomenon outburst prevention technology were explanations. The main conclusions are as follows:(1) Coal-forming process makes the difference structure, porosity, mechanical properties of coal and other aspects of the performance of the difference in the full stress-strain differences in conditions and failure conditions, combined with coal and gas outburst live show proposed regular basis on the results of coal and gas micro unit concept and coal and gas outburst mechanism micro unit damage and think of coal and gas outburst can be seen as a number of coal and gas micro unit damage and continuous destruction.(2) The destruction of coal and gas micro unit of damage to the surrounding coal has a significant role to promote and accelerate, mainly in: Coal and Gas micro unit failure stress concentration around the hole phenomenon, holes of methane coal and gas continued ability to destroy micro unit, in the role of a pure gas damage plastic zone and elastic zone formed around the hole and so on.(3) To stress increases, coal soft layered thickening(poor mechanical properties increased proportion of coal), higher raw coal seam gas pressure, stress concentration of mining and other phenomena are easy to create the coal and gas outburst, but these phenomena or laws can be explained by the coal and gas outburst microelement damage mechanism.(4) The outburst principle prevention measures from the release of concentrated stress, reduce coal and gas micro unit extent of damage; increase coal permeability, destroy coal gas storage conditions; increased energy block near the coal mined-out space length and energy and other damage and needed to be thrown, the body is not easy to reach the coal or coal and gas outburst reach the required one or more conditions, so as to achieve the role of conflict prevention.