Mechanism and Control Technology of Coal Wall Ganging in Back Mining Roadway
Based on the serious coal wall ganging in the range of 340～530 m during the excavation of 3110 backwind tunnel in Qianhe Mine,which leads to large convergence of two gangs in the backwind tunnel,accompanied by the phenomenon of roof sinking and crushing,the main mechanism of coal wall ganging has been reasonably analysed through technical research and the joint control technology of"deep hole super-antecedent grouting+super-antecedent protection anchor cable+truss"is proposed for the ganged column according to the current situation of back mining.Anchor cable"joint control technology,through the actual application of the effect,after the adoption of joint support technology,effective control of coal wall ganging phenomenon,the two gangs convergence from the original 0.68 m to 0.21 m,to ensure the safety of rapid tunneling.
NETL
NSTL
万方数据
