Sectional Support Design of Fault Mining Roadway and Deformation Analysis and Verification of Surrounding Rock
The development of fault structure in a mine area in Guizhou province poses a great threat to the safe production and operation of the roadway.In order to optimize the support design of west 81101 coal haulage roadway in the mine,the distribution law of roof loosening failure zone behind the head during excavation is analyzed by using the borehole peeping method.The results show that the lithology condition of the roof of West 81101 coal tunnel is good.During the excavation of the tunnel,there are only some crack failure areas in the roof,and no serious fracture areas have been observed.According to the different loca-tion of the roadway from the fault,two support methods are designed,the lithology parameters are deter-mined by laboratory testing method,and the reliability of the support scheme is determined by numerical simulation and engineering monitoring method.Numerical simulation shows that under normal support con-ditions,the displacement of top and bottom is 41.2 mm and the maximum vertical stress is 30.2 MPa.Under the support condition of fault area,the displacement of top and bottom is 89.1mm,and the maximum verti-cal stress is 30.3 MPa.Engineering monitoring shows that the displacement of the roof and floor of the sup-porting roadway in fault area is 55～65 mm,and that of the supporting roadway in normal area is 35～45 mm.The surrounding rock of the roadway can be effectively controlled,which indicates that the supporting scheme can guarantee the safe production of the roadway.
surrounding rock deformationfault structuresectional support
万方数据
维普
