Risk Analysis Of Expressway High Slope Based On ANP And Projection Pursuit

In recent years,the rapid development of highways results in the construction technology requirements also will be higher.As one of the most common constructions of expressway,slope construction has undoubtedly become higher standard especially the high slope engineering.Due to the complicated geological structure,difficult construction,and limited by highway's road characteristics,the construction safety of high slope engineering is difficult to be guaranteed.Based on the statistical data of slope accidents collected in recent years,the paper analyzes the accident pattern and distribution law of slope accidents taking the road characteristics of expressway as the starting point.On the basis of the above,this paper combines with the surrounding environment,geological structure etc.and the high slope project uniqueness,deeply studied the impact of highway high slope construction safety factors.And according to the selection principle of evaluation index,the construction safety risk evaluation system of high slope construction is constructed.Based on the current research situation of risk theory both at home and abroad,this paper summarizes the advantages and disadvantages of the commonly used risk weight determination method,and puts forward the ANP structure model for the limitation of the commonly used method for the safety risk of high slope construction.To the three risk characteristics of risk probability,risk loss and risk control as a criterion,the ANP structure model of high slope safety risk is constructed,which is applied to the complex affects and interaction between risk elements.With Semi-quantitative,semi-qualitative way to determine the risk weight,and based on Super Decision software on the model was automatically solved.In view of the problems existing in the commonly used grading evaluation methods,such as lack of basis for the evaluation grade grading standard,too much subjective judgment of index weight and poor reliability of evaluation results,this paper puts forward a safety risk assessment model for high slope construction of expressway based on Projection Pursuit.Based on the sample data,which is excavated by the Projection Pursuit method to get more information.And use Matlab programming to solve the model to work out the optimal projection direction vector and then obtain the integrated projection risk value.And then according to the existing norms to establish the evaluation level grading standards to determine the risk level.Finally,the paper chooses the high slope project of Gansu Pengda Expressway as a research example,carries on the construction safety risk assessment analysis,and compares the analysis result with the actual evaluation result.The comparison results show that the established evaluation model is scientific and reasonable.