Orthogonal Test Analysis on the Sensitivity of Stability Influence Factors of Dao Guapai Perilous Rock in Jiangyou

Three destructive modes, include falling mode, slipping mode and toppling mode, are acted as the objects in this paper. Orthogonal test method is utilized to analyze the sensitivity characteristics of factors which influence the stability of perilous rock in earthquake. Preliminary selection is advanced by the orthogonal test effect numbers of influence factors. Both range analysis and ANOVA are used to analyze and investigate the sensitivity and significance of influence factors. As the conclusion of orthogonal test shows, the stability of falling mode perilous rock is particularly sensitive and significant with four factors, include rock mass volume weight, cohesion, major structural plane obliquity and seismic force. And for slipping mode, the most sensitive and significant factors which influence the stability of perilous rock consist of rock mass volume weight, cohesion and angle of internal friction. Moreover, for toppling mode is the horizontal distance between the center of gravity and the tipping point, seismic force and rock mass volume weight. Therefore, the conclusion can be obtained by the above three tests, that stability of perilous rock in different destructive mode is still majority controlled by three factors include rock mass volume weight, seismic force and characteristics of structural plane.