【作者】 李枫；

【导师】 吴继敏；

【作者基本信息】 河海大学 ， 地质工程， 2005， 硕士

【摘要】 边坡稳定性分析一直是岩土工作者十分重视的问题,天然状况下稳定的边坡经过人工改造就有可能产生失稳。本文对边坡稳定性分析的历史和国内外研究现状作了回顾,就目前在边坡稳定性分析中广泛使用的极限平衡和有限元方法进行了总结,分述了极限平衡计算边坡稳定性的几种方法并进行比较,在介绍有限元的基本原理和有限元软件ANSYS原理的基础上,分析了有限元进行边坡稳定性分析的几种实现方法。结合具体工程项目作稳定性分析评价。对金安桥水电站区域地质条件作简要描述,对工作区的工程及水文地质条件进行了详细的分析,针对堆积体的特殊地质条件进行了详细的描述。对凝灰岩夹层、边坡岩体及其结构特征、边坡的形成条件、边坡可能的失稳形式、影响边坡稳定性的因素和稳定分析的计算荷载分别进行了说明,其中就雾化对边坡稳定性的影响对已建工程进行了统计分析。根据左岸3处崩塌堆积体边坡的工程地质条件,对其进行稳定性评价,分析了各堆积体可能产生的失稳方式。由于堆积体的粘聚力对边坡稳定性起到关键性的作用,所以对堆积体的粘聚力进行反算,确定合理的堆积体粘聚力参数取值。由于3处堆积体所处位置不同,对不同堆积体分别采用不同方法计算各种工况下的稳定性。考虑降雨对边坡稳定的不利影响,分析了孔隙水压力作用下堆积体粘聚力折减后堆积体的安全系数的变化。使用极限平衡方法和有限元法分别对堆积体进行稳定性计算,并应用有限元计算结果作应力和位移分析,计算最不利工况下堆积体的安全系数,判别崩塌体边坡稳定性。通过崩塌体边坡的定性分析和定量计算,总结了崩塌体边坡稳定性分析应该注意的问题,并对极限平衡法和有限元法计算进行边坡稳定性计算的差异和计算结果进行了研究。更多还原

【Abstract】 The analysis of slope stability is always a problem which geotechnical workers think much of, because a steady slope in the nature condition may be unstable for the sake of human remodeling. The paper makes a retrospect, including the history of analysis of slope stability and research actuality both here and abroad. It summarizes extensive used limiting equilibrium theory and finite element method (FEM) at present, describes and compares several methods of limiting equilibrium theory, and analyses several implementation methods of FEM which are applied for the analysis of slope stability on the basis of describing base principles of FEM and FEM software called ANSYS. Then it evaluates stability combined with a project item. This paper describes briefly regional geological conditions of JinAnQiao hydropower station, labors for geological conditions and hydrographic geological conditions in the research region and describes special engineering geological conditions in allusion to talus slide in detail. It illuminates respectively tuff interlayers, rock mass of side slope and their structure characteristics, formation conditions of the slope, potential destabilization types of the slope, Influence factors of slope stability and calculation loads of stability analysis. In this paper, statistic analyses are made considering atomization impacting slope stability. It evaluates stability of three talus slides on the left embankment on the basis of their engineering geological conditions and analyses potential destabilization forms of talus slides. The cohesive strength of talus slides plays an important role in slope stability, so the article inverse calculates it and confirms rational parameter of cohesive strength of talus slides. Because of dissimilar location of three talus slides, it uses dissimilar methods to calculate diversified work conditions. Considering adverse effect of rainfall on slope’s stability, it analyses the change of safe coefficient after cohesive strength of talus slides reducing under the effect of pore water pressure. It respectively uses limiting equilibrium theory and FEM to calculate stability of talus slides, analyses stress and displacements, calculates safe coefficient of talus slides under the worst work condition and estimates the stability of talus slides. By qualitative analyses and calculations, in this article, some problems are summarized, such as analyses of talus slides stability should pay attention to and does research for the calculation results and differences between limiting equilibrium theory and FEM which are used to calculate slope stability.更多还原