| The thesis studied on the problems about the technology of coordinate mining in thin bedrock and thick topsoil coal seam groups of Shenhua Lijiahao coal mine. Firstly, classify the keystratum between the coal seam structure and making the triangular arch structure after the keystrata first breaking and the monocline structure after main roof touching the bottles appearssliding instability or not as the basis to judge whether working face roof appears shear fall or not,and caving form of working face roof of different the key stratum structure and ratio of rock andloadings was simulated and analyzed using UDEC numerical simulation software, and the resultshowed that0.9was the ratio of rock and loading dividing line of whether basic roof appearedsiding instability or not. Secondly, based on the calculation method of uniformly distributed loadon the semi-infinite body and geological radar detection technology, damage depth range of thefloor caused by working face advancing of2-2zhong coal seam, and based on the elastic isotropicbody, stress distribution regularity of the floor was studied in the direction of advancing and twosides of the upper working face.Furthermore, reasonable dip separation of down12108workingface and reasonable arrangement of its mining roadway under the influence of upper working faceextraction was simulated and analyzed using FLAC3D numerical simulation software from theperspective of stress distribution and deformation and failure of coal and rock mass. The resultshowed that40m was the reasonable dip separation, and outside layout12m-14m was theroadway s reasonable arrangement. Finally, according to the field observation of strata behaviorsof12108working face and deformation of its roadway, the validity of theory and simulationanalysis was verified, which provided accordance for coal mine working faces with similarcondition. |
