Numerical Modeling and Investigation of Fault-Induced Water Inrush Hazard under Different Mining Advancing Directions

Evaluations of the risk fault-induced water inrush hazard is an important issue for mining engineering applications. According to characteristics seam floor during advancing, a mechanical model fault activation built obtain equations normal stress and shear on surface fault, as well mechanics criterion activation. Furthermore, using FLAC3D numerical software, variation under two different advancing directions are numerically simulated, distribution plastic failure zone roof near obtained. The results show that: (1) When advances from hanging wall, increases more greatly than that foot changes drastically with large peak, it likely cause (2) wall approaches within first increases, then decreases suddenly. constantly, stays in compaction state where squeezed together, which unfavorable hazard. (3) deep-seated damaged first, obviously. shallow (4) For water-conducting waterproof coal pillar size should be larger wall. (5) in-situ monitoring agreement simulation results, proves effectiveness simulation.