The Rankine assumptions were used as a basis for developing equations for calculating active and passive earth pressures within a slope extending to infinity. The analysis considers: cohesive and noncohesive soils, the angle of internal friction of the soil, seepage forces caused by a ground water table that is parallel to the ground surface, and the plane on which the stresses are to be found may be at any inclination.
General solutions for the failure surfaces in slopes where the assumptions of the infinite slope theory are valid have been derived. The solutions are applicable to layered systems and to any seepage conditions provided that both layering and ground water flow are parallel to ground slope. It is concluded that the infinite slope theory is of limited appUcability unless modified. A modification to enable transition from the active to passive stress states is suggested.
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