The Risk Management And Control Of Subway Station Super Deep Foundation Pit Construction In Soft Clay Area

As China’s comprehensive national strength, rapid economic growth and urbanization, fast forward, urban infrastructure has been developing rapidly. In a second-tier cities, the increase of population, put forward the higher request, the bearing capacity of the city, the rapid development of urban rail transit construction. The problem is the subway construction, the pit depth and urban area is larger, better known as super pit.And geological conditions of the complexity and uncertainty, because once security accidenthappens economic loss, the loss of life.In recent years, suchaccidents, adverse effect.Project is lack of system, the effective construction safety risk assessment and risk management system for further study of subway station deep foundation pit construction safety assessment and management of the soft soil area, provide certain reference for project construction safety risk management.Hangzhou Metro filling station based ultra-deep excavation engineering background, to study the ultra-deep foundation construction safety risks, the main work in soft soil area(1) Extensive literature study of existing construction site feedback, the risk of getting construction safety risk assessment indicators subway station deep foundation construction, and then set up a subway station and by screening area for soft soil deep foundation construction security risk assessment index system;(2) As examples of deep foundation Hangzhou subway project, scoring loss method and probability-based valuation expert, fuzzy comprehensive evaluation, obtain evaluation methods to assess risks of acquiring the degree of risk and risk level;(3) Based on reliability theory for ultra-deep valley foundation stability analysis of three limit state equation, the probability of using ANSYS analysis module excavation, stability analysis under various operating conditions of instability probability of deep excavation research while using the subway in quantitative analysis of deep excavation langzhou.(4) Based on a comprehensive analysis of all the risk factors, risk factors for risk assessment, the higher the score, is targeted measures in the construction, and achieved the desired goal.