| 降雨条件下堆积层滑坡体滑动机制分析 |
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| 引用本文： | 吴火珍,冯美果,焦玉勇,李海波.降雨条件下堆积层滑坡体滑动机制分析[J].岩土力学,2010,31(Z1):324-329. |
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| 作者姓名： | 吴火珍 冯美果 焦玉勇 李海波 |
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| 作者单位： | 中国科学院武汉岩土力学研究所,岩土力学与工程国家重点实验室,武汉,430071 |
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| 基金项目： | 国家自然科学基金，岩土力学与工程国家重点实验室重点项目 |
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| 摘 要： | 以某物流园区堆积层滑坡体为例,分析了地质结构特征及滑坡类型。在此基础上,运用非饱和土力学方法,分析了滑坡体在降雨条件下的动态稳定性特征,揭示了滑动机制及原因,认为滑坡体位于坡面凹槽处,地形较陡、表面堆积层结构松散、强度差,为滑坡形成提供了便利条件;随着降雨持时的增长,降雨沿堆积体表面的裂缝入渗,在土-岩接触面上汇流贯通,形成滞水,降低了滑面土体的力学性质,产生动态浮托力,同时雨水不断充填裂缝和软弱结构面,产生顺坡向的动态扩张力,使张裂缝扩大,加剧堆积体的变形,促使其发生滑动。
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| 关 键 词： | 堆积层滑坡 滑动机制 降雨 非饱和 |
| 收稿时间： | 2010-04-23 |
Analysis of sliding mechanism of accumulation horizon landslide under rainfall condition |
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| WU Huo-zhen,FENG Mei-guo,JIAO Yu-yong,LI Hai-bo.Analysis of sliding mechanism of accumulation horizon landslide under rainfall condition[J].Rock and Soil Mechanics,2010,31(Z1):324-329. |
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| Authors: | WU Huo-zhen FENG Mei-guo JIAO Yu-yong LI Hai-bo |
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| Institution: | State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
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| Abstract: | According to a certain accumulation horizon landslide in the logistics park, the geologic structure characteristic and the landslide types were analyzed. Based on the analysis result, the dynamic stability characteristic of the landslide under rainfall was analyzed; and the sliding mechanism and cause were revealed by the theory of unsaturated soil. It considered that the landslide body on groove of the slope surface, steeper terrain, and loose structure and low intensity of the surface accumulation horizon provided convenient conditions for landslide formation. With the rainfall duration increasing, the rainfall was infiltrated into landslide along the surface of the accumulation mass and formed conflux transfixion on the contacting interface between the soil and rock; so the backwater on the contacting interface was formed. As we had known that the backwater decreased the mechanical properties of the landslide and induced the dynamic uplift force in the landslide. Meanwhile, with the rainfall filling the crack and the weak structural plane continually, the dynamic expanding force was induced and the tension crack was enlarged; and the deformation of the accumulation mass was intensified. Finally, the sliding of the landslide was induced. |
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| Keywords: | accumulation horizon landslide sliding mechanism rainfall unsaturation |
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