Abstract：The stability coefficient of slopes is derived generally according to the static equilibrium equations. The sliding surface is simplified to be a line chain and the slope is sliced vertically in the method of residual thrust. This paper presents a method to calculate the stability coefficient by means of shear strength reduction. A set of equilibrium equations for sliced slopes was established on the assumption of invariable horizontal acceleration within the sliding blocks. The sliding force of the slope was controlled by the dynamic distribution coefficient. The dynamic distribution process of sliding mass from stable to instable was described usually by the process of shear strength reduction. The unified expression between the dynamic and static equilibrium of the slope was derived firstly in this article. The dynamic distribution principle has not only inherited Panjiazheng principle but also developed Sarma method. The computed stability coefficient was identical to that of residual thrust principle，and the computed acceleration was similar to but more accurate than that from Panjiazheng principle. An important conclusion of this article is that the reduction coefficient was linear to the sliding acceleration of slope，which played a critical role in explaining the dynamic mechanism of landslide displacement.
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2018, Vol. 37 
