Research On Construction And Operation Risk Assessment Of Pile Foundation Of Metro Parking Lot Under Complex Environmental Conditions

In recent years,there have been more and more cases of subways and tunnels crossing bad geological zones,high-risk passages,and environmentally sensitive areas in China.The construction risks are increasing,which seriously endangers the safety of engineering construction and later operations.The Shenzhen Metro Line 6 Minle Parking Lot Project has high-speed rail tunnels operating on the Guangzhou-Shenzhen-Hong Kong Passenger Dedicated Line,the Hangzhou-Shenzhen Railway Main Line and the Hangzhou-Shenzhen Railway Link Line.It has a complex structure,environmental sensitivity,geological complexity,difficult construction,and tight schedules.And high construction risk.In order to ensure the construction safety of the subway parking lot,the construction period objectives and the long-term operation safety of the existing high-speed rail filling tunnels under construction,this article relies on the subway parking lot project to carry out the subway parking bridge pile foundation side crossing the existing operating high-speed rail The research work on the construction and operation risk assessment of the tunnel group,the research work carried out and the main results obtained are as follows:(1)Summarized and analyzed the research status and achievements of domestic and foreign underground engineering construction risk assessment,risk prevention and control technology,and the influence of bridge pile foundation construction on existing tunnels,and combed and analyzed the current commonly used domestic and foreign bridge risk assessment theories and methods And its applicability,it discusses the necessity of bridge project risk assessment,assessment process,assessment method,control measures and its key content of risk assessment.(2)According to the judging process of fuzzy comprehensive theory,taking the consideration of construction safety and reducing the impact on existing high-speed railway tunnels as the main principle,a risk evaluation system during the construction of Minle subway parking lot was established.During the period,the risk was judged,and the corresponding risk prevention and control measures were given according to the weight value of each factor and the risk level.(3)Based on the AHP-FCSM-FCEM risk assessment theory and method,a risk assessment was conducted during the operation of the Minle subway parking lot,and corresponding risk prevention and control measures were proposed based on the main risk factors.