Algorithm Implementation of Equivalent Expansive Force in Strength Reduction FEM and Its Application in the Stability of Expansive Soil Slope

Loss of matric suction during rain has an important effect on the instability expansive soil slope. A new device was designed for testing force in order to propose and determine equivalent corresponding suction. First, internal relation between unsaturated analyzed. Then, numerical algorithm implementation discussed, introduced into strength reduction finite element method (FEM). Finally, effects were compared analyzed by evaluating stability The results show that significantly improves accuracy test shortens time. with change initial water content is obvious. can reflect macro contribution soil, developed FEM based be used evaluate rainfall-induced slope caused decrease resulting from rainfall infiltration.