Abstract The water gushing with collapse in process of Wushaoling highway tunnel crossing F4 fault fracture zone is introduced. Combining with geological conditions of F4 fault fracture zone and features of water gushing with collapse,according to the methods of geological survey,field measurement and theoretical analysis,the mechanism of water gushing with collapse and the reasons of initial support failure caused by water gushing and collapse are investigated,and the inner links of which with the surrounding rocks,underground water and geologic structure are analyzed. The water crushing collapse is a kind of the gravel inrush hazard caused by the crushed belts of fault. The support design and construction organization scheme for segments with water gushing and tunnel face are researched,and treatment measures are proposed. According to the measurement results,it is shown that the treatment measures can achieve satisfying results and can ensure the safety of tunnel construction under complicated geological conditions. This research could play an important guiding role and provides a significant reference value for tunnel construction under similar conditions.
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Received: 05 April 2012
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