Surrounding rock control technology of deep large section composite roof mining roadway

Abstract

In view of the problems of roof collapse and difficult roof support in composite roof roadway, the deformation and instability mechanism of composite roof is analyzed, and the cooperative support technology of long and short anchor cables is proposed. The control effect of the original roadway support mode and the high-strength pre-stressed long and short anchor cable cooperative support mode on the roadway surrounding rock is analyzed by numerical simulation. The results show that the improved long and short anchor cable cooperative support scheme can effectively control the roadway deformation and failure, and the volume of roadway plastic zone is reduced by 29.1%; the field monitoring data show that the roof and floor displacement, two side displacement and roof subsidence of the roadway are reduced by 63.6%, 60.4% and 60.2% after the cooperative support of long and short anchor cables, indicating that the support method has a good control effect on the surrounding rock of the roadway with composite roof.

Keywords

• coal mine
• composite roof
• mining roadway
• surrounding rock control
• collaborative support