Risk assessment of water conveyance tunnels construction by shield in collapsible loess area
In order to improve the safety assessment reliability of water conveyance tunnel construction by shield in collapsible loess area,firstly a relatively perfect construction safety risk assessment index system was constructed from four aspects:personnel management,mechanical materials,construction technology and construction environment.Secondly,the grey-DEMATEL method was used to process the centrality to obtain the risk index weight.Thirdly,based on the two dimensions of risk occurrence proba-bility and risk loss degree,a two-dimensional cloud assessment model was constructed.The occurrence probability was deter-mined by the combination of subjective and objective methods,and the loss degree was determined by improving the radar chart method from five aspects:casualties,economic losses,schedule delay,functional defects and environmental impact.Finally,the e-valuation model was applied to the safety assessment of X water conveyance tunnel construction of the Hanjiang-to-Weihe River Diversion Project.The application results showed that the construction risk was small,only grade Ⅱ,which were in line with the engineering practice,verifying the feasibility and effectiveness of the evaluation model.The research results can provide reference for the safety risk assessment of similar water conveyance tunnels construction by shield in collapsible loess area.
water conveyance tunnelshield constructionrisk assessmentcollapsible loess areagrey-DEMATELtwo-dimensional cloud model
国家科技期刊平台
NSTL
万方数据
维普
