Simulation study on fault activation response under mining disturbance of hanging-wall and foot-wall of reverse fault
In order to explore the stress field,displacement field evolution law and fault activation law of reverse faults under different mining methods of coal seams,the evolution law of normal stress and shear stress at faults,fault activation process,and displacement field variation characteristics of faults and overlying strata during the hanging-wall mining and foot-wall mining under reverse fault geological conditions were analyzed by numerical simulation.The results show that with the working face gradually approaching the fault,the normal stress in the upper part of fault gradually decreases and the shear stress grad-ually increases,while the normal stress in the lower part of fault gradually increases and the shear stress gradually decreases.The rate of increase or decrease of normal stress and shear stress increases with the decrease of the distance between working face and fault.When the distance between working face and fault is 80 m and 40 m,the normal stress and shear stress at the fault are different from the regular change of previous stress,and there is a large increase and decrease.Compared with the hanging-wall mining,the fault in the foot-wall mining is more easily activated by the disturbance of coal seam mining,and the degree and range of activation are greater than those in the hanging-wall mining.The research results have certain scientific guiding significance for the treatment of surrounding rock and disaster prevention and mitigation when the coal seam mining meets faults.
fault activationstress evolutionmining on hanging-wall and foot-wallreverse faultweakening assignment method
NETL
NSTL
万方数据
