| The diversified demands of production and life have pushed various infrastructure and housing buildings to be complex and large-scale,prompting the volume of engineering construction to reach a new level and the construction requirements to reach a new height.There have always been deviations between the planned duration and the actual one,it is especially important to control the risk of the duration as an important indicator of the engineering construction schedule management,especially in the past three years when the epidemic,extreme weather,and socio-economic fluctuations have jointly tested the smooth progress of the project schedule.The risks that induce schedule loss change continuously with the implementation status,and each risk not only has a separate output impact and cross-transferring effect,but also evolves and spreads internally by relying on the operation behavior of the front-line construction main part of the project,and its transmission path is intricate and complex.Therefore,it is conducive to establish a more comprehensive and detailed risk transfer management system by exploring the risk transfer law from both internal and external dimensions.This paper collates 26 major schedule risks with high frequency and deep impact in recent years through data collection and questionnaire survey,divides them into 7 levels and 3categories by using DEMATEL-ISM-MICMAC model,constructs the external interactive transmission mechanism of schedule risks,and learns 149 links of project delays caused by cross-transmission of schedule risks at this stage.Based on this,we define the source of project delays and know that 18 risk factors are connected to 187 transmission links,and the input of back-order risks is the main contributor to the expansion of losses by direct risks,and determine the main intermediary risks by combining the number of transmission links connected by risks and the size of driving force,and prioritize the control of such risks to cut off the fundamental risk output path,which can reduce the scope of risk diffusion at lower cost and higher efficiency.The output of construction project depends on front-line workers,whose operation behaviors are subject to numerous disturbances.In this paper,by constructing a complex network-SEIRS model,grasping the small-world characteristics of the front-line construction team network,establishing a network of behavioral propagation relationships based on the differences between team leaders and team members in the propagation of risk behaviors,improving the conditions of SEIRS application,and obtaining the internal behavioral propagation evolution mechanism laws that trigger the risk of work schedule The project proposes six targeted strategies to increase the transmission threshold and inhibit the vicious circle formed by the bad evolution of individual states.It is emphasized to improve the behavior judgment ability of frontline construction subjects and grasp the "nodes with large degree" in the relationship network to guide the group state development. |
