Combined control technology of large-span coal entry with top and side cable truss in kilometer deep mine

According to the problem of rapid failure and instability of large-span coal entery at kilometer deep mine of Xingdong colliery, a new control measure resort to the high pretensioned stress bolt, roof cable truss and coal side cable-channel steel is put forward in the paper. Its control mechanism is discussed and combined support scheme is defined by way of theoretic calculation and analysis, numerical simulation optimization and engineering analogism. The field application shows that the scheme solved the problem of surrounding rock control in kilometer deep mine, and it also creats great economic benefits and provides scientific basis for cable and bolt support under the condition of deeper mining area and higher stress.