【作者】 张丹；

【导师】 李同春；

【作者基本信息】 河海大学 ， 水工结构工程， 2004， 硕士

【摘要】 刚体极限平衡条分法由于其力学模型简单，可以对边坡进行定量的稳定性评价，而且历史优久，经历了长期工程实践的考验，已被工程人员广泛地接受，所以尽管它存在诸多不尽合理的假定，但它仍旧是目前工程设计中进行边坡稳定分析最常用的方法。有限元法能考虑岩土体的应力～应变性质，可求出边坡失稳时岩土体内部各处的应力和变形值，可避免人为的粗糙假定，克服了极限平衡分析法的大部分缺陷。 在用传递系数法求解边坡的稳定安全系数时存在试算的问题，采用迭代法可以较好的解决这个问题。通过算例分析，说明迭代法比常规的试算求解法有更高的计算效率，而且受稳定安全系数初值的选取的影响也更小。 对未知滑动面边坡，临界滑动面位置的确定是传统计算边坡稳定安全系数方法中的关键问题。在用有限元强度折减法求解边坡稳定安全系数的同时，文中提出了一种利用滑坡体破坏时刻的塑性区图确定边坡临界滑动面的方法。 抗滑桩作为治理滑坡的有效工程措施，在世界各国滑坡治理中占有重要的地位。据统计，迄今为止，它是在滑坡治理中应用得最多的工程结构物。常用的抗滑桩内力分析方法把滑坡体和抗滑桩分开来考虑，把滑坡体和抗滑桩的相互作用简化为简单的力的作用，不考虑滑坡体和抗滑桩的变形协调及应力协调。文中提出了一种能把抗滑桩和滑坡体作为整体分析，有效而方便准确地考虑抗滑桩和滑坡体的相互作用的抗滑桩有限元内力分析方法。 紫坪铺水库正常蓄水位高程877m，水库蓄水后将淹没该段现国道213线，因此国道213线将改线抬高至920m高程附近，为正确评价因水库蓄水造成的滑坡、塌岸对改线公路的影响，以及可能产生的移民问题，本文用传递系数法和二维、三维有限元方法对有可能失稳的213国道紫坪铺库区库岸堆积体Ⅰ、Ⅱ区的1号、2号、3号滑坡体进行了稳定性分析。 根据有限元法得出的塑性区图，对紫坪铺水库蓄水后水位骤降可能引起213国道紫坪铺库区库岸堆积体的坡角坍塌范围进行了估计。通过有限元塑性区分析不但能够估计出可能的塌角范围，而且可以看出个别滑体在塌角的同时有可能产生整体滑动。更多还原

【Abstract】 The rigid limited-equilibrium method has simple mechanical model. It can evaluate the slope stability by a fixed quantity. It is accepted widely by engineers, because it is tested by long-term engineering practice. So it is still used frequently to analyze the slope stability in the design of project, though there are a lot of irrational assumers in it. FEM takes the stress-strain property of rock and soil into account. The stress value and deformation value of every point inside the rock and soil can be figured out by it and there is no irrational assumers in it. It overcomes most of shortcomings of limited-equilibrium method.There is trial calculation question in the process calculating safety factor by transfer coefficient method. It can be resolved by iterative method. According to the example analysis, it is proved that the iterative method can advance the calculating efficiency evidently and its calculating speed can be influenced less by assumed original safety factor value.To unknown slip surface slope, ascertaining the location of the critical slip surface is the key problem in the process calculating the slope stability safety factor by traditional methods. The slope stability safety factor is calculated by strength reduction FEM. At the same time the new method ascertaining the location of the critical sliding surface of slope is presented in this paper according to the plastic zone graph at the time of land slide body sliding.As a efficient engineering measure of landslide treatment, anti-sliding pile is a very important measure in the measures of landslide treatment all over the world. On the basis of statistic,it is the mostly used engineering structure in landslide treatment to this day. Common internal forces analysis methods of anti-sliding pile take the landslide body and the anti-slide pile into account respectively, don’t consider the deformation compatible and the stress compatible between landslide body and anti-slide pile. The interaction between landslide body and anti-slide pile is predigested to simple force action in these methods. In this paper a new internal forces analysis method of anti-slide piles is presented. It can take the landslide body and the anti-slide pile into account as a whole, and consider the interaction between the landslide body and the anti-slide pile efficiently and exactly.The normal water level of Zipingpu reservoir is 877 meters. After the reservoir sluices, the national highway 213 in this area will be submerged. So the national highway 213will increase its elevation to about 920 meters. In order to estimate the influence of the slope-sliding and bank-collapsing which caused by the reservoir sluices to the elevated highway, and to estimate possible emigration problem, Stability analysis of landslide bodyNo.l,2,and 3 in I , II area which located in bank accumulation body of Zipingpu reservoir in national highway 213 is made by transfer coefficient method and 2-D 3-D FEM in this paper.The collapsing scope of bank accumulation body of Zipingpu reservoir in national highway 213 which caused by the sharply falling of water level of Zipingpu reservoir is estimated according to the FEM plastic zone graph. To analyze FEM plastic zone graph not only can estimate the collapsing scope but also can prove that when the nether part of some landslide bodies collapse, the landslide bodies probably slide entirely.更多还原