2019 Volume 75 Issue 2 Pages I_371-I_378
In this study, the pore-water pressure in unsaturated soil used in slope stability analysis are disucussed. A seepage force in unsaturated soil and A body force by a difference of pressure heads in unsaturated soil are proposed. Then these forces are employed in the infinite slope stability analysises expressed by the body force method or the water pressure method, and the calculation results are discussed. As the results, the safety factors derived from the equations considered unsaturated seepage behavior showed lower values than the traditional slope stability analysis. Moreover, the effect of the area acted pore-water pressure in unsaturated soil on the slope stability analysis was discussed. It was found that the difference between the body force method and the water pressure method was coused by the area acted pore-water pressure in unsaturated soil when the pore-water pressure in unsaturated soil was considered in the Limit Equilibrium Method.
