Abstract: In order to solve the support problem of crushed surrounding rock of thick unconsolidated layers in Chensilou mine，based on the geological conditions and supporting types and parameters of -720 level main return air roadway.By using FLAC numerical simulation software.Strengthen the control technology of supporting structure is put forward. anchor performance parameters and supporting scheme are simulation analysis including anchorage length、pre-tightening force、anchor length and space between bolts. Simulation results show that design support scheme is superior to the original support scheme.The practice shows that the support scheme is scientific and reasonable, achieve the expected support target.

Key words: thick unconsolidated layers, crushed surrounding rock, support scheme, simulation analysis