关键词: 采矿工程, 断层破碎带, 破坏机制, 悬臂梁, 崩落法开采

Abstract: The field survey, numerical simulation and geomechanical analysis methods are applied in studying the fault effect on the deformation and failure of surrounding rock in the laneway, such as the ?340 m and ?410 m stages of the transportation lanes that are located at the eastern part of the Jinshandian iron mine. The results show that the deformation and damage of roadway near the fault fracture zone affected by mining is serious. The failure modes of surrounding rock include roof collapse, asymmetric subsidence and deformation of the roof, spalling induced by the deformation of surrounding rock in tunnel, horizontal tensile cracks of roadslides, etc. The fault-fracture zone F4, where the transportation lane at ?340 m level, is located at the deformation zone of the ore body induced by mining. The horizontal stress release caused by the movement and deformation of rock body leads to a dislocation stair at the interface between the fault-fracture zone F4 and the hornfels A2 near the ore body. The deformation and failure mechanism of ?340 m level haulage roadway includes the surrounding rocks in tunnel move and deform towards the worked-out area induced by the mining and the slippage and activation of the fault-fracture zone caused by mining result in the collapse of the roof along the steep structure plane. The deformation and failure mechanism of the transport lane at the ?410 m stage is controlled by the squeezing deformation caused by the slip activation of the rock mass at the fault-fracture zone at the ?340 m level and above depth.

Key words: mining engineering, fault-fracture zone, failure mechanism, cantilever beam, caving mining