干湿交替对边坡长期安全性的影响  

Effect of Alternate Wetting and Drying on the Long Term Stabiity of Slope

作　　者：徐千军[1] 陆杨[1] 

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《地下空间与工程学报》2005年第6期1021-1024,共4页Chinese Journal of Underground Space and Engineering

摘　　要：在自然条件下，边坡体内地下水位以上的部分岩土体经常处于干湿交替状态，这对其长期的安全性十分不利。在边坡所受到的全部或部分载荷发生往复变化的情况下，塑性理论要求采用安定分析来评价其安全性，而不是人们常用的、只适用于比例加载的极限分析。本文根据率形式的Koiter机动安定定理，提出了考虑地下水位往复变化情况的边坡安定上限分析方法。利用抗剪强度参数折减定义的安全系数，定量地计算载荷变化对边坡稳定性的影响。分析结果表明，干湿交替对边坡的长期安全性有较大的影响。Alternate wetting and drying usually occur in some parts of the slope, which is fairly harmful for its long term safety. The upper hound limit analysis of slope stability is only applicable for proportional loading. In case of alternate loading and unloading, a shakedown analysis is necessary for its long term safety evaluation. In this paper, an upper hound shakedown analysis based on strong version of Koiter＇ s theorem is presented to analyze slope stability under such alternate loads, The safety factor, which is defined by shear strength reduction of the soils, is adopted by a quantitative analysis to evaluate the influence of alternate load on the slope stability.

关 键 词：干湿交替 边坡稳定 安定分析 单元集成法 

分 类 号：P642.22[天文地球—工程地质学]