SAFETY RISK ANALYSIS OF CROSS-RIVER SEWAGE SHIELD TUNNEL DESIGN
Combined with the tunnel design scheme for the construction project of the second channel of the Jiangxinzhou sewage collection system(crossing the sandwich river section),the checklist method was used to analyze and evaluate the structural design risks,environmental protection risks and project operation risks of the shield initiation section,the mid-river section and the working shafts on both sides of the river during the tunnel design phase,and to determine their risk levels.The corresponding risks were reduced from the design perspective.The main conclusions are as follows:①Risk level of open excavation section:the risk level of Jiangxinzhou working wells and Jiangnan working wells is Ⅲ,②Risk level of shield section:the risk level of shield initiation section,shield section on the north bank of the river,shield section in the middle of the river,shield section on the south bank of the river and shield receiving section are all Ⅲ.The risk of adaptability of the shield and its important supporting facilities,the risk of waterproofing of the pipe sheet,and the risk of cracking of the pipe sheet are level Ⅲ,③The risk of operation of the pipeline project and the social and environmental impact are level Ⅳ.
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