Influence of rainfall-induced wetting on the stability of slopes in weathered soils
Influence of rainfall-induced wetting on the stability of slopes in weathered soils
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DOI：
10.1016/j.enggeo.2004.06.017
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发表时间：
2004-11
影响因子：
7.4
通讯作者：
Jae-Hong Kim;Sangseom Jeong;Seong-Wan Park;J. Sharma
中科院分区：
文献类型：
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作者：
Jae-Hong Kim;Sangseom Jeong;Seong-Wan Park;J. Sharma
风化土中边坡的浅层破坏是由长期降雨入渗引起的。这些破坏主要是由于湿润带加深，并伴随着水的渗透引起的基质吸力的减少。本文报道了韩国常见的两种风化土壤中降雨湿润带深度的变化趋势。根据滤纸测得的土-水特征曲线和张力计试验，对湿润带深度进行了理论和数值分析。结果表明，在风化土中，湿润锋吸力的大小对边坡的稳定性起着关键作用。基于修正的Green和Ampt模型的理论分析往往低估了韩国典型风化土的润湿带深度。对于韩国风化土，当湿润带深度达到1.2m时，安全系数迅速下降。
Shallow failures of slopes in weathered soil are caused by infiltration due to prolonged rainfall. These failures are mainly triggered by the deepening of the wetting band accompanied by a decrease in matric suction induced by the water infiltration. This paper reports trends of rainfall-induced wetting band depth in two types of weathered soils that are commonly found in Korea. Both theoretical and numerical analyses for wetting band depth are presented based on the soil–water characteristic curve obtained using filter paper as well as tensiometer tests. It is found that the magnitude of wetting front suction plays a key role in the stability of slopes in weathered soils. Theoretical analysis based on modified Green and Ampt model tends to underestimate the wetting band depth for typical Korean weathered soils. It was also deduced that for Korean weathered soils, the factor of safety drops rapidly once the wetting band depth of 1.2 m reached.