蒋中明,伍忠才,冯树荣,钟辉亚,王江营,王桂尧.考虑暂态饱和区的边坡稳定性极限平衡分析方法[J].水利学报,2015,46(7):773-782 |
考虑暂态饱和区的边坡稳定性极限平衡分析方法 |
Limit equilibrium method for stability analysis of slope with transient saturated area |
投稿时间:2014-11-07 |
DOI:10.13243/j.cnki.slxb.20141334 |
中文关键词: 边坡稳定性分析 降雨入渗 暂态饱和区 暂态水压力 |
英文关键词: slope stability analysis rainfall infiltration transient saturated area transient water pressure |
基金项目:国家自然科学基金资助(51178063) |
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中文摘要: |
降雨入渗导致边坡表层出现暂态饱和区并形成暂态水压力。为了研究暂态水压力对边坡稳定性的影响,通过文献研究,总结归纳了边坡暂态饱和区存在形态类型及暂态水压力分布特点,并定义了暂态水压力分布比例系数。基于费伦纽斯条分法,改进了条分假定,提出了考虑条块侧向已知水荷载影响的安全系数计算方法,推导了边坡潜在滑动面位于暂态饱和区与非饱和区两种情形下的安全系数计算公式,编写并验证了可以考虑暂态水压力影响的边坡稳定性分析程序,并进行算例分析。研究表明:边坡安全系数随暂态饱和区厚度的增大而减小,超过一定深度后安全系数将基本维持不变;暂态饱和区厚度相同条件下,暂态水压力分布系数越大边坡安全系数越小;随着暂态饱和区厚度增加,边坡最不利潜在滑动面位置深度呈现减小→增加→减小→增加的变化规律;由于忽略了条间荷载影响,传统费伦纽斯条分法安全系数计算值偏大。 |
英文摘要: |
Rainfall infiltration leads to the generation of transient saturated area and forming transient water pressure in a slope. For investigation of the influence of transient water pressure on the slope stability, the distribution of transient saturated area and transient water pressure in the slope under the rainfall conditions were analyzed based on the literature research. A coefficient for the description of the transient water pressure distribution is also defined. Assumptions of Fellenius slices method were improved, and the method for safety factor calculation with consideration of water pressure acting on the lateral side of the slice is proposed. Furthermore, formulae for calculation of the safety factor of a slope with transient water pressure were deduced in the cases of potential sliding surface in transient saturated area and unsaturated area. A routine for the slope stability analysis based on above suggested formulae was programmed and calculated results of examples were given to illustrate the valid of the programmed routines by the authors. It shows that the safety factor of a slope decreases with the increase of transient saturated area thickness and trends to be a constant after the thickness of transient saturated area reaches some value. The safety factor of a slope with transient saturated area will also decrease with the increase of coefficient of transient water pressure distribution in the case of the thickness of transient saturated area keeping the same. The location the potential sliding surface also changes with the variation of transient saturated area thickness and appears a law of decrease, increase, decrease and increase again. Due to neglect of the influence of lateral water pressure on the slice safety factor, the safety factor calculated by the traditional Fellenius slices method is larger than that of improved method proposed in this paper. |
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