Study On Coupling Effect Of Human-Environment Safety Risk Factors In Construction

With the development of economy and society,subway has become an indispensable transportation for citizens.In recent years,many provinces and cities in China are carrying out large-scale subway construction.Attention to construction safety is an important part in subway construction.The occurrence of subway construction accidents is caused by the interaction of multiple risk factors.The risk of coupling degree in subway construction means the degree of close relationship between systems in subway construction process.It can also be understood as the degree of interdependence between different risks.The qualitative and quantitative research of various risk coupling relationships in subway construction process is carried out in this paper and reduce the occurrence of metro safety accidents.Among many factors that affect the safety of subway,four factors(human,machine,environment and management)influence the safety level of subway construction together,and also cause the risk of subway construction is increasing.In this paper,the subway construction accidents in 2010-2016 are counted,and N-K model is used to calculate the risk coupling value and probability value of human,mechanical,environmental and management factors in subway accidents.Based on the results of N-K model,the paper found that the more risk factors are involved in coupling,the greater the probability of accidents.This is also consistent with the fact that there are more risk categories and more accident probability in actual subway construction.At the same time,it is find that the coupling value of human factor,environmental factor and management factor are the largest risk in 3 factors risk coupling,and that in 2 factors coupling risk,the coupling risk between human factor and environmental factor is the greatest risk.It shows that there was a great coupling between human factor and environmental factor,and the subway construction risk control should be given priority to human factor and environmental factor.It is also the factor selected in this article.The result of N-K model is also an important reference for the study of coupling risk system based on human and environmental factors.By consulting the literature,the paper constructs the risk index system of subway construction safety system which contains four factors:human,mechanical,environment and management,and establishes the coupling degree model.The coupling degree model is established by AHP analytic hierarchy process.The weight of each index system is calculated,and the Delphi method is used to score the current risk level of the secondary index system of the subway construction safety system risk index system.The rationality of the scoring result is verified by editing the reverse cloud generator in Matlab software.Finally,the risk level of each index is brought into the efficiency function,and the coupling coefficient of different kinds of risks is calculated.The dynamic simulation model of SD system is designed.Vensim PLE software is used to simulate the coupling coefficient,the risk level of the secondary index and the weight of the index in the coupling degree model.In this paper,the total value of the risk coupling level of human-ring factors in the remaining 14 months of a project of Xi'an Metro Line 5 is dynamically simulated.By adjusting the coupling coefficient of different kinds of risks in the risk coupling system,Find out the risk coupling factors that have the greatest influence on the total value of the human-loop risk coupling level.Combined with coupling degree model and system dynamics model,the risk level of the coupling of Human and Environment safety risk factors in subway construction is simulated and analyzed.According to the final simulation results,the coupling factors which have the greatest and risk trends influence on the coupling risk level of human and environmental safety risk factors in subway construction are found out.It is found that the coupling superposition of multiple risk factors will increase the overall level of the system rapidly.Among them,the most significant impact of the human and environm factor risk coupling on the value of the risk coupling level is to monitor the key risk factors identified and avoid coupling multiple risk factors.It is necessary to establish the risk factors at a lower level of risk.Good defense mechanism to prevent risk beyond the threshold is difficult to control.So as to strengthen the management of measures,and to provide reference and reference for reducing the occurrence of subway accidents.