Investigating the effect of Antecedent Rainfall on Pore-Water Pressure Distribution Characteristics in Residual Soil Slopes under Tropical Rainfall
The main characteristics of fluctuations in pore-water pressure distribution are connected with unsaturated soil slope instability. Flux boundary conditions at the soil–atmosphere interface have a direct impact on them (rainfall infiltration, evaporation, and evapo-transpiration). Two slopes at the Universiti Teknologi Malaysia’s Skudai campus in Malaysia were instrumented using a Jet Fill Tensiometer. To study the effect of antecedents, field monitoring data was used to estimate pore-water pressure distributions on residual soil slopes under tropical climate conditions. The effect of rain on pore-water pressure distributions Slope stability analyses were also performed at a depth of 1.0-2.0 metre for each slope to determine the factor of safety range. Preceding rainfall, beginning pore-water pressures before to a big rainfall event, and the magnitude of the rainfall event all have a role in the establishment of the worst pore-water pressure state on a slope, according to the findings. The influence of antecedent rainfall on the creation of the worst pore-water pressure state was shown to be greater in residual soils with low permeability than in residual soils with high permeability. Low permeability residual soi factor of safety
Mohamed Elbyhagi Elfadil
Bridges Department, NewTech Consulting Group, Sudan.
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