Abstract
The principle of effective stress is the keystone of modern physics, which becomes the basic difference between soil mechanics and general solid mechanics. Terzaghi’s effective stress principle has been controversial since it was put forward, especially for the calculation of effective stress, many scholars have revised it from different aspects. The pore pressure is reduced in all different modified formulas, that is, the pore pressure need to be multiplied by a pore pressure factor. However, the variation of pore pressure factor has always been ignored because the reduction of pore pressure is very small. In this paper, the effective stress expression considering the contact area coefficient is modified to the u-p formation dynamic equation, and the influence of the change of contact area coefficient on the dynamic characteristics of soil is studied.
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