Abstract: In this paper, the main control parameters for coal bumps were generalized, and the mechanical mechanism of coal bump induced by fault dip. In addition, the simplified model of thrust fault was constructed, and the effect law of stress field, energy field and roof subsidence, etc., that inducing coal bump was simulated and studied in the conditions of different fault dip angles. The results show that when mining in the hanging wall, the peak abutment pressure, peak elastic energy and roof subsidence increase with the increase of fault dip in the condition of fault dip smaller than 45°, and while the fault dip is greater than 45°, the opposite results will be obtained. When mining in the footwall, the peak abutment pressure in front of the face decreases with the increase of fault angle. While the fault dip is 60° or 75°, the peak abutment pressure moves forward, which will raise the coal bump risk. The peak elastic energy and roof subsidence ahead of the face decrease with the increase of fault dip in the condition of fault dip smaller than 45°, and while the fault dip is greater than 45°, the opposite results will be obtained. Whether mining in hanging wall or footwall, the elastic energy and vertical stress in the fault area will increase with the increase of fault dip angle. In a word, fault dip angle has a greater influence to coal face when mining in the footwall.

Key words: thrust fault, fault dip angle, coal bump, abutment pressure, elastic energy, roof subsidence