Safety Accident Cause Analysis In Subway Station Construction Based On Improved FRAM

With the rapid development of subway construction in China,the safety accidents of subway occur frequently.Among them,the collapse accidents usually bring more casualties and serious economic losses,which is the most frequent type of subway construction safety accidents.By analyzing the causes of subway construction collapse accidents,we can understand the mechanism and risk of the accident,thereby effectively avoid the recurrence of similar accidents.It is difficult for traditional accident analysis methods to systematically analyze the causes of accidents.In order to understand the complexity of the subway construction safety accident system and comprehensively analyze and predict the risk factors of the accident system,this thesis uses the functional resonance analysis method(Functional Resonance Analysis Method,FRAM)to analyze the causes of subway construction collapse accidents from the perspective of normal operation of the system,and puts forward corresponding barrier measures according to the analysis results.Firstly,the evolution process of accident cause theory and the background and principle of FRAM model are reviewed.Then,the existing common cause analysis methods of subway station construction safety accidents are analyzed,and compared with FRAM analysis method from the aspects of application scope,advantages and disadvantages,etc.,so as to discuss the feasibility and applicability of using FRAM model to analyze the causation of subway station construction safety accidents.Aiming at the limitation of subjectivity in the specific method of FRAM model without system function identification,this thesis proposes to use the sequentially timed events plotting(Sequentially Timed Events Plotting,STEP)method to identify the function of accident system,construct the STEP-FRAM model and elaborate its application steps in detail.The improved model is applied to a specific accident case as an example study,and use the FMV visualiser(FRAM Model Visualiser)to describe the functional attributes of the accident system to analyze the coupling changes of functions,thus automatic generating the FRAM functional network diagram,and bringing up corresponding barrier measures for the functional resonance units with failed links,according to reducing the probability of such accidents happening again.The STEP-FRAM model is used to analyze the cause of the "12·1" collapse accident in the cross passage of Shahe Station of Line 11 under construction in Tianhe District,Guangzhou,and 7 functional fluctuations are identified,which results in the failure of the link that caused the accident.The root cause of the accident is found to be the weak awareness of safety and risk of the construction unit,as well as the inadequate performance of the supervisory unit.The conclusions obtained are more comprehensive and objective than the traditional methods of accident causation analysis,and provide new ideas for reducing or avoiding construction safety accidents in construction projects.The research results of this thesis have certain reference function for the cause analysis of subway construction safety accidents,and provide a feasible method for the cause analysis of such accidents,which is conducive to the management and supervision of the safety management in the subway construction process by enterprises and relevant departments,also has important theoretical significance and engineering practice value for improving the risk pre-control ability of the safety management of subway construction.