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

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 law 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, we connect the model experiment with ANSYS numerical simulation to analyze the time-space law, 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 Yangquan Mining Company and Weijiadi Coal Mine of Jingyuan Mining Company, the methane drainage system arrangement which drainage the methane comes from the mining coal seam, his paper is subsidized by the natural science research item of Shaanxi province(2002E219) and the special science research plan item of Education Bureau of Shaanxi province(00JK220).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 Weijiadi Coal Mine and Baijigou 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.