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Research On The Rational Layer Of High Level Suction Along Roof Strike With Large Mining Height

Posted on:2015-08-24Degree:MasterType:Thesis
Country:ChinaCandidate:J J GaoFull Text:PDF
GTID:2271330479951596Subject:Mining engineering
Abstract/Summary:PDF Full Text Request
Gas disaster always is one of the major problems affecting the safety and efficient production of mine. Reasonable and efficient extraction of goaf gas can not only prevent the occurrence of mine gas disasters, and the extraction of gas as a kind of clean and efficient energy can also used for production and life. At present, the domestic and foreign scholars and technical personnel of the extraction method to make the roof high smoke a lot of research, to solve the deep low permeability gas coal seam mining under the condition of large mining height efficient extraction from one of the effective means of pressure relief gas.In recent years, Goaf gas emission increases with scale of coal mining and mining depth deepening and gradually increase, that is a mining working face and the upper corner gas concentration overrun one of the important factors influencing the mining face is the urgent need to solve the problem. This paper by mining rock mechanics, fluid mechanics, the mechanism of coal and gas coupling related knowledge as the theoretical basis, the state and FLAC3 D numerical simulation to validate the method, 2-603 working face in liyazhuang coal mine actual geological condition as the prototype, are analyzed and studied the practical geological situation of liyazhuang overburden under the height of the "two belts" growth altitude, and the stope overburden fracture after coal seam mining, the dynamic changes of the stress and displacement situation analysis.For 2-603 working face high fault outside alley pumping horizon determination of laid a foundation. Finally, in combination with the practical situation of liyazhuang coal mine working face of large mining height are broken analysis of high fault outside alley pumping advantages and disadvantages in the process of application, and during the production period is analyzed on the basis of site classification data outside the wrong alley pumping extraction flow, high concentration, pure gas amount, drainage negative pressure and flow rate of high field drilling parameters. Combined with the "two belts" growth altitude finally be pulling high fault outside lane head-on, extraction from borehole end at the bottom of the overburden fractured zone, can extract the goaf gas pouring amount within the fracture zones in coal and rock, the largest and thus achieve the purpose of the working face of production safety and high efficiency serve.
Keywords/Search Tags:Goaf gas, Overlying rock, Similar simulation experiment, High level suction roadway
PDF Full Text Request
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