Study On The Law Of Mining-induced Fracture Evolution Of Overlying Strata And Relieved Methane Delivery And Its Application In Project

In accordance with a large amount of gas emission in gob under the condition ofhigh-intensity fully mechanized caving mining, gas concentration exceeding limitshave occurred in upper corner, and drainage before mining is not easy due to lowseam permeability, lacking of corresponding theory in gob gas drainage technologyparameter quantitative research design lead to unsatisfactory drainage effect. Usingtheoretical analysis, experimental testing, validation of numerical simulation andon-site monitoring tools, major research on formation mechanism and distributioncharacteristics of the displacement field and fractured field of mining conditions andmined crack field relief gas flow patterns, combined with the actual gas draining,innovate and optimize the extraction process and parameters. The results show that:the evolution of overburden rock fissures field in time and space, the relieved Gascorrelation and the interaction between them are the theoretical basis of Gas Controland Drainage, also the key to control gas accident. The results has a certain theoreticaland practical significance for gas control in upper corner, ealize the efficientextraction from gob, ensure safe and efficient mining of working face.