唐扬;殷坤龙;夏辉;

• 1:中国地质大学(武汉)地质调查研究院
• 2:中国地质大学(武汉)工程学院

摘要(Abstract)：

降雨是诱发滑坡的主要因素之一。目前普遍认为,湿润锋下移导致的土体基质吸力减少是降雨影响滑坡失稳的主要原因,而土壤前期含水率是影响湿润锋下移过程的重要因素之一。基于Green-Ampt模型,推导了考虑坡角影响下的滑坡体降雨入渗表达式,同时,结合无限斜坡模型分析了持续稳定的降雨条件下滑坡体稳定性的变化情况,探讨了前期含水率对于降雨过程中浅层滑坡稳定性的影响规律。结果表明:随着降雨的持续进行,浅层滑坡稳定性开始下降较快,之后趋于平缓。前期含水率会影响湿润锋的下移速度,当前期含水率分别为0.32,0.36,0.40时,湿润锋下移速度分别为0.109,0.173,0.42m/h,说明前期含水率越大,湿润锋下移的速度越快;而前期含水率对于浅层滑坡稳定性的影响主要在降雨初期。

关键词(KeyWords)： 降雨入渗;Green-Ampt模型;无限斜坡模型;前期含水率

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41572292;41572289)

作者(Author): 唐扬;殷坤龙;夏辉;

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