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2011年“9·16”特大暴雨在四川南江县诱发数以千计的群发性缓倾浅层土质滑坡,且滑坡集中发生区域往往都是稳定性较好的大片良田和村落聚集地,值得高度关注。在充分调查研究此类滑坡特征与形成条件的基础上,利用Geo-studio数值分析手段及室内试验,系统地研究了强降雨条件下此类斜坡的入渗特征和稳定性状况。结果表明:这场暴雨在坡体内的入渗存在6m的最大入渗深度,湿润区所能涉及的范围有限;随着饱水浸润历时的增长,土体抗剪强度不断衰减,持续软化作用明显;土层越薄,基覆界面被浸润软化的时间越长,相应抗剪强度越低。降雨入渗特点和土体的饱水软化作用是导致滑坡呈现上述特点的主要原因。
In 2011, “9 · 16” torrential rain induced thousands of massively inclined shallow soil landslides in Nanjiang County, Sichuan Province, and the landslides were often concentrated in large areas of good stability and village gatherings, Worth attention. On the basis of fully investigating the characteristics and formation conditions of such landslides, the infiltration characteristics and the stability of such slopes under heavy rainfall conditions were systematically studied by means of Geo-studio numerical analysis and laboratory tests. The results show that there is a maximum infiltration depth of 6m in the infiltration of the slope body, and the limited range of wetting zone can be covered. With the increase of saturated wetting, the shear strength of the soil continuously decays, and the continuous softening effect is obvious The thinner the soil, the longer the interface of the basement and cladding is infiltrated and softened, and the lower the corresponding shear strength. The characteristics of rainfall infiltration and soil water softening are the main reasons leading to landslides.