Abstract
This study presents a procedure for calculating the change of the safety factor for unsaturated slopes of homogenous, residual soils suffering from rainfall infiltration within Khanh Vinh district, Khanh Hòa province. Rainfall is supposed as a main trigger caused failure of the potential sliding slopes. Rainwater into the slope due to infiltration caused an increase in moisture content and negative pore water pressure; a decrease in matric suction and in shear strength on the failure surface. Thus, slopes are reduced stability and can be failed. Soil permeability and rainfall intensity were found to be the primary factors controlling the instability of slopes due to rainfall, while the initial water table location and slope geometry only played a secondary role. A numerical model of analysis coupled seepage-stability used to simulate the seepage and slope stability under conditions of specific environment such as soil permeability, rainfall intensity, water table location and slope geometry in the study area. The relationships between safety factor and rainfall intensity, soil permeability, angle slope, high slope were identified to provide a good indication for the management of landslide hazards under the effects of rainfall.
Highlights
The impact of climate change affecting rainfall patterns in many parts of the world causing many landslides
Rainfall intensity and the soil permeability were considered the primary parameters affecting to the process of the rainwater infiltration into the slope, increase in pore-water pressure in during rain and decrease in slope stability, while the other parameters such as initial groundwater table location, slope angle and slope height contributing to determine the initial factor of safety of the slope only played a secondary role
Results in analysis study series D (Fig. 12) under duration rainfall 1, 3, 5 and 10 days showing the influence of the slope height to slope stability under different conditions of rainfall intensity
Summary
The impact of climate change affecting rainfall patterns (intensity and duration of rain) in many parts of the world causing many landslides. Many high terrains with tropical and subtropical climate covered mainly by residual soils are prone to frequent rainfall-induced slope failures. This issue is often result in costly repair works and pose considerable concern to infrastructure developments and the environmental protection. This problem occurs more by the strong socioeconomic development and rising to huge demand for construction of technical infrastructure. Numerous researchers have investigated the causes of slope failures in tropical regions and concluded that rainwater infiltration is the most important factor triggering the instability of slopes. The rainwater infiltration causing changes in porewater pressures and soil permeability are two factors that significantly influenced in the instability of slopes
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