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As many different size faults in the fully-mechanized sublevel caving mining area overlying rock, undermine the continuity of rock deformation, and the occurrence of different conditions, the impact properties vary widely. This paper studies the impact of faults on the water inrush with specific examples of project, obtained the discontinuous deformation on both sides of fault zone induce the fault zone secondary activate and result in it’s water transmitting ability dramatic increase; with the mining geometry increases, the water flowing-fracture zone height increase and lead to the water conductivity channel of faults connect with rock fracture zone, so as to constitute water inrush channel and likely to cause water inrush accident, so to explore the influence of fault for underground work safety has important theoretical significance and application value.

The experimental study on the case of bond failure happening at the grout-rock interface about mortar bolt, the concrete matrix is sudden destroyed when loading specimen which grouting length 60mm, compared to previous research, it is reduced by dilatancy effect when mortar is pressed out of the body, this paper analyzes the concrete axial radial pressure when mortar is pressed out and the dilatancy effect using the finite element method.