基于点稳定系数法的非饱和河岸边坡稳定性分析
发布时间：2018-07-24 14:29
【摘要】：河岸边坡的整体稳定性计算,无法定量反映水位变化对边坡各部位局部稳定性的影响。基于点稳定系数法与非饱和土力学理论,运用非饱和流固耦合模型进行河岸边坡的稳定性数值分析。以某大型模型试验为例,通过绘制边坡在水位升降作用下各时段所对应的点稳定系数分布云图,揭示边坡的破坏原因与内部稳定性变化过程,并与实际观测结果进行对比。研究表明:点稳定系数法能合理地描述河岸边坡各位置的稳定性及其动态变化,与实际吻合良好;边坡临空面稳定性较低,水位缓慢上升将导致有效应力降低及非饱和区基质吸力丧失,易诱发浅层失稳;水位下降形成的动水压力,是导致边坡稳定性下降的主因,坡脚处最易失稳,致使边坡发生牵引破坏;边坡内部点稳定系数随水力梯度的增大而降低,非稳定区分布面积随水力梯度的增大而增大,并主要分布于浸润线以下、坡脚以上。研究成果为此类边坡的稳定性评价及治理提供了一定的科学依据。
[Abstract]:The calculation of the whole stability of the riverbank slope can not quantitatively reflect the influence of the water level change on the local stability of the slope. Based on the point stability coefficient method and the theory of unsaturated soil mechanics, the numerical analysis of the stability of riverbank slope is carried out by using the unsaturated fluid-solid coupling model. Taking a large scale model test as an example, by drawing the cloud map of the point stability coefficient distribution corresponding to each period of time under the action of water level rise and fall, the failure cause and internal stability change process of the slope are revealed, and the results are compared with the actual observation results. The results show that the point stability coefficient method can reasonably describe the stability and dynamic change of riparian slope, which is in good agreement with the actual situation. The slow rise of water level will lead to the decrease of effective stress and the loss of matrix suction in unsaturated area, which will easily induce the shallow layer instability, the dynamic water pressure caused by the drop of water level is the main cause of the slope stability decline, and the slope foot is the most vulnerable to instability. The internal stability coefficient of slope decreases with the increase of hydraulic gradient, and the distribution area of unstabilized area increases with the increase of hydraulic gradient, and mainly distributes below the infiltration line and above the slope foot. The research results provide a scientific basis for the stability evaluation and treatment of this kind of slope.
【作者单位】： 中国地质大学(武汉)教育部长江三峡库区地质灾害研究中心;
【基金】：国家自然科学基金项目(41272309)
【分类号】：P642.2
本文编号：2141673
[Abstract]:The calculation of the whole stability of the riverbank slope can not quantitatively reflect the influence of the water level change on the local stability of the slope. Based on the point stability coefficient method and the theory of unsaturated soil mechanics, the numerical analysis of the stability of riverbank slope is carried out by using the unsaturated fluid-solid coupling model. Taking a large scale model test as an example, by drawing the cloud map of the point stability coefficient distribution corresponding to each period of time under the action of water level rise and fall, the failure cause and internal stability change process of the slope are revealed, and the results are compared with the actual observation results. The results show that the point stability coefficient method can reasonably describe the stability and dynamic change of riparian slope, which is in good agreement with the actual situation. The slow rise of water level will lead to the decrease of effective stress and the loss of matrix suction in unsaturated area, which will easily induce the shallow layer instability, the dynamic water pressure caused by the drop of water level is the main cause of the slope stability decline, and the slope foot is the most vulnerable to instability. The internal stability coefficient of slope decreases with the increase of hydraulic gradient, and the distribution area of unstabilized area increases with the increase of hydraulic gradient, and mainly distributes below the infiltration line and above the slope foot. The research results provide a scientific basis for the stability evaluation and treatment of this kind of slope.
【作者单位】： 中国地质大学(武汉)教育部长江三峡库区地质灾害研究中心;
【基金】：国家自然科学基金项目(41272309)
【分类号】：P642.2
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，本文编号：2141673
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