Large-span thick-layer rock compound top board coalroll prestressing force combined support

On the basis of pre-stress initiative support,the combined controlling technology of truss cables is put forward to analyzing the problem of large section set-up room with fractured surrounding strata.The finite element software of FLAC is chosen to make a numerical analysis of supporting parameters of truss cables,including angel,length,distance and density of cables.And then the effective supporting scheme is established.Taking the Xinyuan coal mine as an example,the joint controlling technology of truss cables is applied in starting cut D302 successfully.