Research and Practice of Crossing Through Fault Roadway Repair Technology

In the light of the unfavorable situation that Donghuantuo coal mine-230 m auxiliary return air roadway crossing fault result in surrounding rock serious deformation and influence coal mine safety production,The passage deeply analyzes the surrounding rock deformation mechanism in this roadway.The results show that the surrounding rock fragmentation phenomenon is serious and water expansion and softening in this roadway,the surrounding rock have engineering soft rock and geological soft rock characteristics,surrounding rock of roadway in broken soft rock large deformation is main feature.the paper put forward the advance grouting and high density anchor combined support technology of roadway repairing.This scheme is demonstrated by using the numerical simulation method.Engineering test shows that top and bottom and two side’s convergence deformation are below 210 mm after restoration of tunnel,convergence rate is less than 2 mm/d,and roadway reaches overall stability soon and surrounding rock deformation of roadway gets thoroughly control.