Abstract:

The floor water inrush in coal mine is a complicated multi-physics coupling issue. Combined with fractured zone under the conditions of stope mining background, the coupled hydro-mechanical module of Universal Distinct Element Code (UDEC) is used. And the dynamic development and distribution of fault deformation and stress, floor abutment pressure, flow vector and flow velocity are systematically analyzed as the working face advances. It is shown that the coal mining process of stope sill and faults fractured zone are mutual influenced. The abutment pressure which is representative of mining-induced stress is the main inducement of forming water flowing fracture zone and making activation of fault. While the presence of fault makes the stress more concentrated between working face and faults fractured zone, which increases the risk of floor water inrush. In addition, the water flowing fracture zone mainly concentrated in front of and rear of the working face, which is the main channel of floor water inrush.

Key words: floor water inrush, fault, hydro-mechanical coupling, mining-induced stress, water flowing fractured zone