Evaluation of the Performance of the Horizontal Drain in Drainage of the Infiltrated Water from Slope Soil under Rainfall Conditions

It is known that rainwater infiltration crucial for rainfall-induced slope failure because the infiltrated water can significantly weaken shear strength of unsaturated soil. Horizontal drains are commonly used to provide appropriate drainage percolates out a slope. However, effects length and location subsoil pipe on performance horizontal have not been extensively investigated. In this paper, parametric analysis by using numerical model was adopted investigate distribution pore-water pressure in The results reveal an inclination angle 10–15 degrees strategic placement at toe mid-slope optimal performance, as compared effect length. Multi-layers drain (based 10 m length) recommended slopes with height more than 15 m.