Numerical simulation of rock mass deformation and movement by mining under building and road

There is a temporary ore bin and road to pass through the northern mining area above No.1 orebody cluster in the Songjiapo copper mine. The surface deformation and strata movement caused by underground mining will threaten the safety of ore bin and road transportation. Field investigation and laboratory experiments were carried out. Using numerical simulation method, the rules of ground pressure activity and mechanism of strata deformation movement were analyzed by different mining methods. Moreover, the corresponding control measures were put forward. Two new methods of reserving vertical ore pillar and controlling the span of mined-out area were proposed to preserve the stability of surface ore bin and road. The results show that the stress concentration and the displacement of the overlying strata can be effectively reduced by controlling the span of mined-out area. The optimal first mining area was recommended. The results can provide the theoretical basis for the actual mining design and strata control.