Risk Assessment And Coping Study Of Pressure Balance Support For Extra Deep Foundation Pit

In recent years,with the use of state control of city land and vigorously promote the development of low-carbon economy,more and more underground project implementation.The deep foundation pit engineering increasingly large scale,accompanied by its complexity,dynamic risk led to the accident probability and the scale of losses will increase.The high incidence of accidents,deep foundation pit,not only a significant loss of life and property for the stakeholders,but also bring serious influence to the society.The pressure load balance supporting ultra deep foundation pit in soft soil is a new supporting system,are the domestic construction companies gradually recognized and engineering application.This paper analyzes the engineering characteristics of the pressure balanced support system of deep foundation pit The risk of deep foundation pit,pressure load balance supporting system faces according to the identification,assessment,response to the three stages were studied.226 cases of the deep foundation pit accident case,using statistical analysis method,causal analysis method and expert investigation method,carry out risk identification,the pressure load balance supporting system of risk the list of factors;fault tree analysis method is used to obtain the ultra deep foundation pit system 18 minimum cut sets,minimum path set size 4,using probabilistic expert scoring method to show the event and the possible loss of the risk,the risk factors of value.Finally,it is applied to the project case,and the network plan is adopted Benefit analysis,select the best response program.