Abstract:Taking the strata of the area between Faults F3 and F4 in the Renlou Coal Mine as the prototype,the similar material model is constructed. The mining effect of the rock mass at fault zone and the possibility of water-inrush from the aquifer of footwall of fault are simulated. The results show that,with reducing the coal pillar,there are differences between the deformation of rock mass of two walls of the fault,and the characteristics of mining effect are different. And when the coal pillar is reduced to a certain value,there is relative movement between the hanging and the foot wall rock mass of the fault and the fault becomes active resulting in water-conducting along the fault. Meanwhile,the confined aquifer influences the mining effect in the fault and promotes the fault to become active. Therefore,in the process of the establishment of water-preventing coal pillar in the fault,the factors must be considered to provide reliable protection for the safe and efficient production of coal mine.