Wave-induced stability analysis on submarine infinite slope with gentle dip angle

For wave-induced stability analysis on submarine infinite slopes,the limit equilibrium method generally ignores horizontal stresses acting in the soil deposit. On basis of describing the characteristics of the submarine infinite slope under wave action and considering the soil stress state at the slip surface,this study proposed a stress analysis method to analyze sliding stability of the submarine infinite slope,and discussed the applicable prospect of the method. A case study of a submarine infinite slope has been conducted by both of the limit equilibrium method and the proposed stress analysis method. The results have shown that the factor of safety by the stress analysis method is greater than that of the limit equilibrium method,and the differences of factors obtained by the two methods become larger with increasing depth of the slip surface,Poisson ratio of the soil deposit and dip angle of the infinite slope. For a submarine infinite slope with gentle dip angle under wave action,it may slide along a slip zone rather than a single slip surface under unstable state,and the depth for the maximum shear stress does not generally indicate the most instability location of the infinite slope.