Methane Delivery Law In Mining Fissure Elliptic Paraboloid Zone And Its Application Analysis

Mine gas is an important factor for damaging safety production. Gas disaster is one of the worst coal mine disasters. As the mechanization level of continuous improvement, the mining depth increases, exploitation of growing strength, the gas emission will further increase and gas disaster management is increasingly becoming focus of coal mine disaster prevention. By researching the law of gas migration on mechanized mining face of high-gas coal mine, the thesis is helpful to guide the coal mine gas-management and coal mine safety. It has a certain theoretical and practical significance.This paper summarizes and reviews the achievements and lasted advances of methane harness and drainage theory and its applying. It is pointed out that the distribution configuration of mining fissured in overlying stratum and the methane delivery laws in mining fissured are the research emphasis in the future, and are the theoretical base of fulfilling the safely simultaneous extraction coal and coalbed methane. Based on these viewpoints, distribution configuration of the fissure production development and the zone and feature of the sufficient relieve pressure in overlying stratum. At last we prove that after bed-separated fissures and broken fissures of the mining overlying stratum are connected, which space distribution form is a dynamic Mining Fissure Elliptic Paraboloid Zone (EPZ), and further research the EPZ's basic features.The mathematical model of methane flow in Mining Fissured Zone is deduced with the coupled theory of coal and methane, mining rock mechanics and the principle of communication substance mechanics. Based on the mathematical model, we draw the basic laws of methane delivery in mining fissured zone. It is obtained that Elliptic Paraboloid Zone supplies the drainage and space for relieved methane flow and collection, and is the methane delivery and collection zone, that will provide the theoretical basement for logical arranging the methane drainage system. Through the field applying in Fifth Coal Mine of Zhujiao Coal Mine of Xinlong Mining Company, the methane drainage system arrangement which drainage the methane comes from the mining coal seam, adjacent coal seam and mine goaf is analyzed. The results show that if the drainage roadway throat or suction hole terminal arranges in mining fissure zone, the suction efficiency and suction concentration of methane can be raising and attains better suction effect. At last the examples of methane suction and application effect in Zhujiao Coal Mine explain that coal and methane extracted simultaneously and safely, that are the triple effects guaranty of fulfilling mine safety production, new energy supplement and atmosphere environmental protection, and can obtain significant economy and society effect.