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Abstract Crack is one of the major diseases of the tunnel lining in the operation phase，especially the arch longitudinal cracks are more hazardous to the bearing capacity of the original lining. Through the evaluation criterion of crack，the safety of lining with longitudinal crack was evaluated；and the safety level was proposed. Meanwhile，the stiffness degeneration model was used to evaluate the bearing capacity of the original lining；and the structure safety coefficient was calculated before lining reinforcement. Engineering case study shows that the stiffness degeneration model to evaluate the capacity of lining is feasible，which provides an important basis for the reinforcement of the tunnel，as well as a new reasonable method for the safety evaluation of the lining with longitudinal cracks，the bearing capacity calculation，and the reinforcement designing.
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Received: 11 March 2009
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