Abstract: The remediation of the highway tunnel excavation collapse induced by the groundwater gushing in the Pingtian Tunnel crossing an F2 faulted fracture zone in the Dapu Expressway project is introduced in this paper. Factors that caused the accident were evaluated and investigated in depth. The remediation plan was proposed based on the thorough investigations and was effectively implemented in the construction. Both the inflow of the groundwater into the excavated area and the deformations of the supporting structures were under the control. 

Key words: tunnel excavations, faulted fracture zone, groundwater gushing, tunnel collapse, remediation plan