Construction and application of highway slope stability evaluation index system
There are many highway slopes in mountainous areas and many geological units.The factors affecting slope sta-bility are many and complex.The construction of evaluation index system is conducive to the rapid judgment of slope stability.However,in the construction of the existing evaluation index system,the influence of the interaction of multiple influencing factors on the stability of the slope is rarely considered,which affects the rationality of the stability evaluation results.In this paper,30 representative slopes of Anhui Tangtun Expressway are selected as samples,and the evaluation index system is con-structed by using the interaction matrix method.The main conclusions are as follows:The importance ranking and weight val-ue of the indexes are determined by using the interaction matrix.Seven indexes of slope size,slope gradient,slope height,rock mass strength,structural plane orientation,structural plane characteristics,structural plane combination and rock mass structural unit type are selected from 8 evaluation indexes to construct the stability evaluation index system.According to the semi-quantitative expert value method,the index is assigned,and the instability index(SⅡ)is calculated by combining the index weight,and the slope instability index grade is divided.The index importance ranking method based on the interaction matrix provides a quantitative calculation method for weight determination.The results obtained by the slope instability index method reflect the actual situation of slope stability,and have good application value.
interactionrelationship matrixslope stabilityindex systeminstability index
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