SAFETY RISK ASSESSMENT AND CONTROL OF EXISTING BRIDGE CROSSED BY TUNNEL CONSTRUCTION
SU Jie1，ZHANG Dingli1，ZHOU Zhengyu1，NIU Xiaokai1，2，TAI Qimin1
(1. Tunnel and Underground Engineering Research Center of Ministry of Education，Beijing Jiaotong University，Beijing 100044，China，2. Beijing Muntcipal Engineering Research Insutute，Beijing 100037，China)
Abstract：Due to the uncertainty subway construction and complexity structure of bridge, safety risks on new subway crossing to existing bridge construction are significantly increased. For solving this security problem, safety risk assessment and control system including detection before construction，assessment before construction，dynamic control under construction，assessment and restoration after construction is proposed. Then possible risk is recognized. Control indexes and control standards under construction, especially the maximum differential settlement of existing bridge are put forward. Based on the application of grouting and active lifting measures, under the guarantee of information method，the security of existing bridge in the whole process is realized. According to the analysis of the data after construction，the necessary assessment and restoration after construction should be adopted. The achievement is applied in Line 6 Beijing Subway construction crossing to the garden bridge. According to the results analysis, the desired control goal has been achieved so that the existing bridge safely operation will has been realized during the whole construction.
CHENG C Y，DASARI G R，LEUNG C F，et al. 3D numerical study of tunnel-soil-pile interaction[J]. Tunnelling and Underground Space Technology，2004，19(4/5)：381-382.
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2015, Vol. 34 
