Study On The Disposed Methane Drainage Technology Of Fully Mechanized Caving Face

This paper summarizes and reviews the achievements and lasted advances of methane harness and drainage theory and its applying. It is pointed out that methane drainage technology of fully mechanized caving face especially the disposed face is the research emphasis in the future, and it is the most important technology measure to govern the coal mine methane disaster in our country. Based on these viewpoints, we connect the model experiment with RFPA 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 its basic features.Using RFPA and 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. Refering the status of Baijigou Coal Mine and Wulan Coal Mine of Ningxia Mining Company, it combines the checking of field situation in fully mechanized caving face 103 of Tianchi coal mine in Shan'Xi, the methane drainage system arrangement which drainage the methane comes from the gob coal seam, high part coal seam tail roadway and the high roadway 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 fully mechanized caving face 103 of Tianchi coal mine in Shan'Xi explain that their methane drainage technology have achieved good results and obtained better safety benefits and economic benefits.