| 考虑降雨的非饱和土边坡稳定性分析方法 |
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| 引用本文： | 陈善雄,陈守义.考虑降雨的非饱和土边坡稳定性分析方法[J].岩土力学,2001,22(4):447-450. |
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| 作者姓名： | 陈善雄 陈守义 |
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| 作者单位： | 中国科学院武汉岩土力学研究所LRSM开放研究试验室, |
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| 基金项目： | 国家自然科学基金资助项目(编号:19802021) |
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| 摘 要： | 降雨往往是引起热带和亚热带的膨胀土、残积土边坡失稳的主要促发因素。地处热带和亚热带的膨胀土、残积土往往是非饱和的，由于吸力的存在，土体抗剪强度较高，土坡是稳定的，一旦发生降雨，雨水将渗入土体，土体饱和度增加，吸力锐减并引起抗剪强度大幅度下降，当持续降雨的历时和强度超过一定程度时，则可导致土坡失稳。采用极限平衡分析方法，建立了一套能考虑水分入渗的非饱和土边坡的稳定性分析方法，该方法考虑在降雨后土坡水分为一分布场及抗剪强度参数为饱和度的函数。给出了一个计算实例。计算结果表明，降雨引起的土坡失稳往往为浅层破坏。
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| 关 键 词： | 降雨 稳定性 土边坡 极限平衡分析法 抗剪强度 |
| 文章编号： | 1000-7598-(2001)04-0447-04 |
| 修稿时间： | 2001年4月24日 |
Analysis of stability of unsaturated soil slope due to permeation of rainwater |
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| CHEN Shan-xiong,CHEN Shou-yi.Analysis of stability of unsaturated soil slope due to permeation of rainwater[J].Rock and Soil Mechanics,2001,22(4):447-450. |
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| Authors: | CHEN Shan-xiong CHEN Shou-yi |
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| Abstract: | Rainfall is usually the major factor causing the slope failure of the expansive soils and residual soils in tropical or subtropical regions.During the fine days,the expansive soils and residual soils in tropical regions or subtropical regions become desiccated and shrunken.When it rains,rainwater percolates into the fissures,causing the clay slope surface to swell and to be saturated with a corresponding reduction in shear strength.When the intensity and duration of rainfall exceed certain level,slope failure then results from a reduction in shear strength due to saturation.With limit equilibrium method,the stability analysis method of unsaturated soil slope due to raining permeation were developed,in which the shear strength parameters were considered as the function of saturation degree and the instantaneous distributions of water content within slope after rainfall.An example was given.The result shows that the slope failure due to raining permeation usually is characterized by shallow layer failure. |
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| Keywords: | unsaturated soil slope rainfall slope stability analysis |
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