Deformation of Shenzhen subway aroused by deep excavations andits risk control technology

Because the subway is the most important infastructure in a city, effective design and construction measures of neerby deep excavations must be adopted to protect it. The rules of deformation aroused by deep excavations near the subway are gained according to case studies and practical deformation data. Based on the regional experience, the risk control technologies for deep excavations include deformation control standards of subway structure with proper safety redundancy, risk classification of deep excavations according to the possible influence level on subway, defferent technical demands according to the classification, survey technology, supervision during the construction process and the back-evaluation after the completion of excavation. The results indicate that all the nearby excavations do not disturbe the normal operation of subway.