ANALYSIS ON THE MECHANISM OF OVERBURDEN INSTABILITY CAUSED BY FAULT SLIP OF STEEPLY INCLINED ORE-BODY

The fault is the important boundary factor of the metallogenic structure. Fault stability influence the stability of overlying rock mass and ore-body. The study analyzed the mechanism of fault slip induced by mining in the No. 3 mine zone of the Jinchuan Mine. The fault slip led to the overlying rock mass deformation. This article also studied the process of fault slip based on the characteristics analysis of deformation of surface and underground. The results showed the evolution characteristics of the stress and displacement distribution. The fault slip process was divided into six stages, slowly growth stage, shocking stage, rapidly growth stage, peak value shocking stage, initially slip stage and rapidly slip stage. The evolution law of fault displacement showed the process of fault slide consist of displacement cumulative stage and sliding stage. And the displacement cumulative stage is divided into decelerate slide, stable slide and accelerate slide.