Based on the serious instability of the surrounding rock during the tunneling of 1306 haulage tunnels in Fusheng Coal Mine over DF7 fault zone,which causes the problems of difficult roof support,high breakage rate and slow tunneling speed,the original roof anchor support is reasonably optimized through technical research,and the combined support technology of"truss anchor+trapezoidal beam belt+π-type steel shed"is proposed."Joint support technology.Through the actual application effect,the optimised support in big fault zone can control the broken and sinking phenomenon of surrounding rock caused by fault traction,and the failure rate of anchor rods(cables)is reduced from 13％to 4％,and the digging speed of the roadway over the fault zone is increased to 4.8 m/d,which achieves remarkable application results.
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