Study on Classification of Loess Collapse Risk in Northwest China
Loess collapse is famous for its wide distribution,large quantity and great harm,and is a typical geological disaster in the Loess Plateau region.In order to study the classification criteria of loess collapse risk assessment,the formation mechanism and occurrence conditions of loess collapse were analyzed,and the evaluation indexes were proposed,such as instability evidence,human activities,slope structure,groundwater activity,microgeomorphology,collapse scale,movement velocity,material composition,distance of disaster bearing body and slope morphology.Based on the interpretive structure model,the evaluation indexes of loess collapse risk are classified and stratified,and the weights of 5 levels of loess collapse risk evaluation indexes are determined by exhaustive comparison method,and some regularization treatment is carried out.The application shows that,on the basis of normalization,the risk of loess collapse can be divided into four levels:high risk(7.50～9.97),moderate risk(5.00～7.50),mild risk(2.50～5.00)and slight risk(0.00～2.50).
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