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Fault fracture zone is an important factor leading to tunnel collapse. Studying the influence of the fault’s spatial shape on the scope of tunnel collapse is important. In this paper, the discrete element numerical simulation method is used to study the possible collapse range and displacement caused by fault dip angle and thickness. The results show that the change of fault dip angle has a greater impact on the collapse range and displacement value, while fault thickness has a smaller effect on it. However, when the thickness of the fault is large, the collapsed body of the vault cannot be self-stabilized, and the bottom collapsed body needs to provide support for it to keep stable. The research can provide guidance for the prediction of the scope of the collapse and the rescue of the accident caused by the collapse.

Numerical study on the influence of spatial shape of fault fracture zone on the scope of tunnel collapse