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Abstract In this paper，the similarities and differences of numbers of water inrush in Dapingshan tunnel have been comprehensively studied in combination with site-specific geological tectonic environment，rock lithology，and hydrogeological environment in Wudang nappe structure belts. The effect of nappe belts on water inrush，the controlling effect on reservoir structure，and the hydrogeological environment associated with construction condition have been considered to analyze the mechanism of karst water inrush. On basis of the conclusion，a risk assessment model has been established considering five risk-evaluation geological factors. Fuzzy optimum theory was used to screen the optimum combination of geo-environments which are most dominant factors to potentially inducing karst water inrush. In addition，the risk mitigation method in terms of the key point of geo-environmental risk assessment associated with comprehensive geophysical method was put forward，and the site-specific construction conditions on working face were used to verify its rationality. Results show that the risk prediction method proposed can play an important role in risk mitigation in karst tunnel. In addition，the conclusion mentioned above also shows that geological analysis as the core in comprehensive geophysical prospecting method is the main focus of geological forecast in terms of risk mitigation.
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Received: 20 May 2013
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2014, Vol. 33 
