Risk Assessment Of Highway High Slope Excavation Based On Variable Fuzzy Sets Theory

Highway engineering construction usually has to cross different terrain and geomorphic units.It is necessary to excavate the mountain body under the extremely complicated geological conditions,thus forming a large number of deep excavation road high slopes,which poses a huge hidden danger to the highway engineering construction and seriously threatens people's Production and life safety.Therefore,evaluating the potential risk status in the excavation construction of slope engineering and formulating corresponding countermeasures is an effective treatment method to reduce and reduce the construction risk of the cutting slope,and it is also an urgent need for highway engineering construction in China.At the same time,it is of great significance to construct and improve China's highway construction safety risk management system and strengthen the safety risk management and risk pre-control of roadside slope construction.The paper analyzes the main factors affecting the stability of highway high slope excavation for the high slope of highway cutting,and then establishes the risk evaluation index system for highway high slope excavation.By introducing variable fuzzy sets theory,the comprehensive evaluation model is constructed.The engineering examples were verified and analyzed to evaluate the risk of high slope excavation.The main contents of the paper are as follows:(1)Based on the common failure types and deformation and failure characteristics of highway slopes,the main factors affecting the stability of highway high slope excavation are analyzed.According to the influencing factors,the causal analysis of highway high slope excavation risk is drawn,combined with the index system.The construction principle establishes a risk evaluation index system for highway high slope excavation.The index system is divided into 14 categories including slope scale,slope excavation,engineering geological conditions and induced factors.(2)Based on the comparative analysis of the advantages and disadvantages of the main and objective weighting methods,the method of weighting the evaluation index by the structural entropy weight method is determined.At the same time,based on the principle of minimum discriminant information(MDI),the entropy weight with strong objectivity is introduced.The method corrects the weight value determined by the structure entropy weight method.Through the example verification,the weighting method has certain feasibility.(3)Aiming at the large amount of ambiguity and uncertainty and objective dynamic variability in the risk assessment of highway high slope,by introducing variable fuzzy set theory,selecting variable fuzzy optimization and evaluation theory model and method,based on risk rssessment rodel for righway high slope excavation based on variable fuzzy setstheory.(4)Select specific engineering examples,apply the established evaluation model to the specific evaluation examples,combine the modified index weights for comprehensive evaluation,and use the level variable eigenvalue discrimination criteria to judge the results,and obtain the target slope as a high risk.The high slopes,which are biased towards extremely high risk levels,have high risk levels,and the evaluation results are basically consistent with the actual engineering,which verifies its rationality and feasibility.On this basis,suggestions for risk control measures are proposed from the perspective of ensuring slope stability.