Current Status of The Mechanism of Floor Heave in Deep Tunnels

Floor heave is an important problem in coal mining. And there has been no consensus on the mechanism of floor heave in deep roadways. Severe floor heave can affect the ventilation, bottom slope and normal use of machinery in the roadway. In this case, analyzing the current situation of the research on the mechanism of floor heave in deep roadway, and we can divide the floor heave into three types. According to the form of floor heave by using similar material simulation and numerical simulation: flexure and folded type, water swelling floor heave type and extrusion liquidity floor heave type. Among them, the soft rock roadway is mainly extruded fluidity floor heave, and when the bottom rock is hard, the flexure and folded type floor heave is mainly form, and there are rocks with strong water absorption in the surrounding rock, such as montmorillonite, which will produce large water swelling deformation. Commonly the prevention and control of floor heave can be divided into two categories: reinforcement and pressure relief.