Study On The Dynamic Control Of Coupling Risk In Deep Foundation Pit Construction

At present,China's subway construction has entered a golden period of development.With the rapid development of subway projects,subway safety accidents have also occurred frequently.The construction of subway foundation pits is affected by many factors such as geological conditions and surrounding environment.On the one hand,risk factors are not independent and they are interrelated.On the other hand,these interrelated risk factors are constantly changing during the construction.Therefore,there are many risks during the deep foundation pits construction of subway stations.Therefore,this paper studies the coupling relationship,risk transfer law and dynamic analysis method of subway engineering risk factors,and proposes a dynamic analysis model of deep foundation pit coupling risk.In addition,the model is also applied in the foundation pit engineering of a metro station.The engineering verification shows that the method can effectively deal with the complex coupling relationship and achieve dynamically risk control.Firstly,in order to achieve dynamic control of coupled risk in deep foundation fit,this paper focuses on the analysis of relavant reseach from two aspects: the risk management of deep foundation pit and dynamic risk coupling model.Secondly,based on the above theory,this paper constructs a dynamic control model for deep foundation pit coupling risk:(1)the risk association analysis is carried out based on Apriori algorithm of association rules minning,and the correlation between risk factors is explored;(2)the coupling risk analysis based on complex network is carried out to find the law of foundation pit coupling risk transfer;(3)based on the association rules and the results of complex networks above,the dynamic Bayesian network model of deep foundation pit in coupling risk control is constructed.This model can achieve real-time risk analysis,including pre-accident,duringconstruction and post-accident control.And relevant recommendations for risk management and control measures are put forward to achieve dynamic coupling risk control to ensure the construction safety of deep foundation pit.Finally,the above model is applied to a deep fit foundation in a subway station to verify its effectiveness and applicability.The result shows that the model is feasible and has potential application.Safety control during the construction of the foundation pit provides effective decision support.