clayey soil slopes;  dynamic pore water pressure;  yield seismic coefficients;  Dynamic stability

Through the quasi-static equilibrium analysis of infinite slope, the influence of moving hole pressure on the seismic stability state of infinite slope of saturated clay soil was discussed. The analysis shows that the attenuation of shear strength caused by the accumulation of pore water pressure during earthquakes will lead to permanent deformation of the slope, and even lead to overall sliding failure, and some clayey soils can also cause slip failure due to liquefaction. A cohesion limit value is introduced to distinguish the final failure mode of such slopes, and the two boundary moving hole pressure ratios are introduced to evaluate the influence of shear strength attenuation on its failure mechanism. Finally, the discriminant diagram of the steady state of such slopes is given, and the analysis steps are suggested.