Research On Safety Risk Dynamics Of The Coupled Engineering Construction System

The engineering construction have greater potential safety hazard than other industries because of its characteristics, such as dynamic work environment, labor-intensive, the use of heavy equipment, project interim. These hazards induce frequent and serious safety accidents. Then we need to modeling safety risk dynamics and give some risk control advice. There are many different categories of security risk factors in the engineering construction, in general these risk factors can be classified into two levels, the society and technology. So we need to analyze the engineering construction from the perspective of system. The traditional risk analysis method either lack of a system perspective or haven't considered the coupling effect between these risk factors. The analysis result deviates from the actual situation and can't the management of security risks. In this paper, to prevent and control the occurrence of safety accidents, modelling safety risk dynamics in the consideration of both systemic and coupling.First of all, this thesis introduces concepts of coupling, analyze the characteristics of the engineering construction system, then analyze the engineering safety accident types and distribution characteristics and the corresponding safety risk factors based on the safety accident case. Thus put forwards the research route of this paper. This thesis will study the problem combined with the construction subsystem classification, namely one kind of safety accident type which related to the construction organization subsystem, another kind of safety accidents which related to engineering construction organization system and physical system.Secondly, in order to analyze the evolution of safety state of the construction project system with the risk factors coupling, this thesis respectively established security risk model of the subsystems of construction organization and the physical based on the history theory of risk analysis. Then explains how each subsystem evolved based on decision-making criteria and the security risks and the nonlinear effects under the coupling of the decision-making criteria and safety risk. The two subsystems constitute engineering construction system through security risk transfer and feedback.Again, in order to illustrate the effectiveness of the engineering construction safety risk model, this thesis analyze the case of xianghu lake subway foundation pit construction. And then analyze how the organization system of the xianghu lake foundation cause risk factors under the coupling of in the decision criteria, and the further change of the properties of the physical system under the coupling of the risk factors based on the theoretical mentioned before. Eventually the security state of the foundation, displacement of supporting structure, have nonlinear changes.