Evaluation Of The Protection Effect Of Multiple Pressure Relief Mining In The First Mining Area Of Faer Coal Mine

With the widely application of the protective layer mining and the continuously deep mining of coal mine,multiple pressure relief mining will be more and more common.This article summarizes the mechanism systematically of the protective layer on numerous pressure relief mining and gas migration rule research status,and combines with the practical mining situation of FaEr mining coal,studies the protection mechanism and the effect of pressure relief mining to protective layer by theoretical analysis,FLAC^3Dnumerical modeling and the methods of field measurement.By using the related knowledge of elastic mechanics,referencing the basis of predecessors’research achievements,it establishes the rock mass mechanic model of protective layer multiple pressure relief mining.And analyze the variation of stresses of the above rock and Underlying the surrounding rock in protective layer mining.And it also analyzes the fracture of surrounding rock and the gas migration law.Theoretically analyses the protective layer on the multiple pressure relief mining pressure relief effect.It analyzes the pressure release process and the change regular characteristics of surrounding rock of the protective layer multiple pressure relief mining,by combing the actual mining situation of FaEr coal mine,using simulating to the above protective layer multiple pressure relief mining by FLAC^3Dnumerical simulation software,and simulating each pressure relief mining overlying and underlying layer of surrounding rock and its surrounding rock stress and the plastic zone distribution.Combined with the theoretical analysis,numerical simulation result and the layout of the working fave,it designs the multiple pressure relief mining protective result evaluation scheme.It gets the protected layer related to the gas parameters and protection effect of above protective multiple pressure relief mining by testing the protected layer gas parameters of each site and analyzing to the data.It provides the technical reference and theoretical support to manage the multiple pressure relief mining working space and to extract protected layer pressure relief gas.For the down hole sealing difficulty and affecting the gas pressure test by the water and extracting the gas,it comes up with the three blocked two sections of down hole grouting hole sealing pressure technology and designs the down hole drainage device to improve the effect of the gas extraction,and it solves the difficulty for down hole in engineering practice.One area of FaEr coal mine uses the multiple mining technology industry and achieve success.And the it gets the expected result.And the result is conductive to the similar protective layer mining.