SAFETY EVALUATION OF TUNNEL LINING WITH LONGITUDINAL CRACKS AND REINFORCEMENT DESIGN
WANG Hualao1，2，LIU Xuezeng3，LI Ning1，XIE Dongwu3
(1. Institute of Water Resources and Hydroelectric Engineering，Xi'an University of Technology，Xi¢an，Shaanxi 710075，China； 2. The First Highway Survey and Design Institute of China Communications Co.，Ltd.，Xi¢an，Shaanxi 710048，China；3. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China)
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.
