Infinite Slope Stability Analysis for Unsaturated Granular Soils


Anuchit Uchaipichat

Department of Civil Engineering, Vongchavalitkul University, Nakhon Ratchasima, 30000, Thailand



This paper presents a derivation of expression for factor safety of infinite granular soil slope including the effect of matric suction. The derivation is based on effective stress concept. The simulation results show the variation in safety factor of infinite slope of granular soil with matric suction. The factor of safety increases with matric suction for the value of matric suction less than residual suction but decreases with increasing matric suction for the value of matric suction greater than residual suction. Moreover, the safety factor at very high value of suction is close to that at very low matric suction. Furthermore, the simulation results show the fluctuation of safety factor with matric suction becomes smaller with increasing value of thickness of sand layer.

Keywords: Infinite slope; Suction; Granular soils; Partial saturation

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