During mining process of Shuanglong coal mine of Shannxi Coal Chemical Firm,the main roof transportation belt roadway and the main coal ventilation rail roadway supported by bolt-shotcrete all suffered severe deformation or failure,shotcrete layer cracking,the roof hanging bag,the lateral wall bulging,the floor heave and other ground pressure phenomenon were frequent,resulting in the normal transportation and ventilation of the mine roadways are disturbed,which are forced to repair main roadways.According to the current situation of layout and production in Shuanglong coal main,the theoretical analysis of the system,numerical calculation,physical similar simulation experiment,and on-site observation of the deformation or failure of two main roadways show that the main reasons for the deformation of the main roadways are the superposition of mining pressure on both sides of the main roadway,the swelling of the soft rock with water,the interlacing of the surface peaks and valleys,transportation roadway arranged in the roof,and other compound effects.Based on the results of deformation analysis of main roadways,the maintenance technology program was determined to use the form of "anchored bolt and cable + metal mesh + W steel strip + shotcrete" after removing the cracked shotcrete layer,the net bag and loose rock,the section of serious deformation supplements the U-shaped steel semi-circular arch retractable supports to strengthen the support.On-site tests showed that the maintenance technology scheme can effectively control the further deformation or failure of the main roadways,which is safe,reliable,economical and reasonable,and has a good effect,thus ensuring the smoothness of the mine transportation and ventilation system.