Abstract:In view of the imperfection of current collapse vulnerability evaluation system, based on the vulnerability evaluation, the "10 factors" index system has been constructed from the two aspects of primary factors and induced factors, and the EWAHPSIM collapse vulnerability evaluation system has been established by comparing current multiple evaluation models, and the collapse vulnerability evaluation has been conducted for 6 tunnel entrances and exits along a highway in the southwest. It is showed that the coupling form of entropy weight method (EW), analytic hierarchy process (AHP) and comprehensive index (SIM) makes up for the inaccuracy of the data collected by entropy weight method and the artificial subjectivity of analytic hierarchy process, and other shortcomings of their respective methods, so as to determine the weight of collapse impact factors more scientifically and reasonably. It can be seen from the size of index weight that the comprehensive weight values of slope shape S3, lithology S4, exposed structural plane S5, distance from fault S6 and human activity S10 are relatively high, ranging from 0.093 to 0.271, which are sensitive factors, while the comprehensive weight values of slope height S1 and vegetation coverage S8 are relatively low, which are nonsensitive factors. Based on the EWAHPSIM evaluation system, 6 low risk areas, 3 medium risk areas and 3 high risk areas have been obtained, which are consistent with the actual situation of the study area. It can provide some references for the prediction of collapse geological hazards and risk assessment of dangerous rock and rockfall.
