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Water infiltration characteristics of unsaturated soil slope and its effect on suction and stability

机译：非饱和土边坡的入渗特征及其对吸力和稳定性的影响

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摘要

Rainfall has been considered the cause of the majority of slope failures and landslides that happened in regions experiencing high seasonal rainfalls. The mechanism of the failures was mainly due to the lost of matric suction of soils by rainwater. This paper presents the results of a laboratory model study on the effect of slope angle and surface cover on water infiltration into soil and soil matric suction. A field infiltration test is carried out for comparison. A parametric study is also done to examine the effect of permeability ratio, development of perched water table and rainfall intensity on the factor of safety against instability of a soil slope. Results of the model study show that different surface covers on slopes have an effect on the water infiltration. Generally the covered surface (grass or geosynthetic net) has a lower infiltration rate compared with the bare (no cover) surface. On the effect of slope angle, it was observed that water infiltration decrease with increase in the slope steepness. With regards to the movement of the wetting front, it appears that water infiltration is more at the toe compared with the top of the model slope. Based on the parametric study, it is found factor of safety of the slope against instability drops for slope with higher ratio of permeability for the permeable and impermeable stratum. As the perched water table is formed, the factor of safety decreased. The rainfall intensity also has a marked effect on the slope factor of safety. The higher the intensity of the rainfall, the higher is the infiltration rate into the soil, hence the lower is the factor of safety against slope instability.
机译：降雨被认为是季节性降雨多的地区发生的大多数边坡破坏和滑坡的原因。破坏的原因主要是由于雨水使土壤对基质的吸力丧失所致。本文介绍了一个实验室模型研究的结果，该模型研究了倾斜角和表面覆盖对水分渗入土壤和土壤基质吸力的影响。进行现场渗透测试以进行比较。还进行了参数研究，以检查渗透率，栖息地下水位的发展和降雨强度对抵抗土质边坡失稳性的影响。模型研究的结果表明，斜坡上不同的表面覆盖对水的渗透有影响。通常，与裸露（无覆盖层）表面相比，覆盖表面（草或土工合成材料网）的渗透率较低。在斜坡角度的影响下，观察到水的渗透随着斜坡陡度的增加而减少。关于润湿前沿的运动，与模型坡度的顶部相比，似乎趾部的水渗透更多。在参数研究的基础上，发现对于可渗透和不可渗透地层具有较高渗透率的边坡，抗不稳定性​​下降的安全系数。随着栖息水位的形成，安全系数降低。降雨强度也对安全的斜率有显着影响。降雨强度越高，渗透到土壤中的渗透率越高，因此抵抗斜坡失稳的安全系数就越低。

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