托巴水电站边坡稳定分析及加固措施评价

发布时间：2018-05-30 12:24

本文选题：托巴水电站D1边坡 + 稳定性分析　；参考：《西北农林科技大学》2014年硕士论文

【摘要】：D1边坡是托巴库区滑坡群中的一个关键边坡，位于托巴水电站左岸初拟坝轴线下游，距坝下游电站出水口较近，该滑坡体沿河长约430m，分布高程1620m～1845m，后缘边界呈弧圈形，下游侧边界见完整的基岩，中部为一缓坡平台，前缘延伸至河床，沿水边线未见基岩出露。D1边坡坡体已经下卧到河床，而河床构成了强大的反力体，整体稳定性较好；其中上部局部滑体稳定安全系数不高，尤其在暴雨（泄洪雾化）工况下，很可能发生变形，严重影响到大坝及泄水建筑物的运行及安全。因此对D1边坡进行稳定性分析及加固治理，具有重要的理论意义和工程价值。本文采用极限平衡法，，对边坡的稳定性进行分析，并给出建议的治理措施，研究的主要内容如下：（1）通过项目现场的地质调查，查明边坡的工程地质条件、变形破坏形式，并进行现场原位试验，得出物理力学性质指标，确定了边坡稳定分析的力学参数。（2）本文依据极限平衡法，针对D1边坡的4个主要滑坡剖面进行稳定分析。计算控制工况分为持久工况、短暂工况、偶然工况三种，可得出相应工况下各边坡对应的安全系数。通过二维极限平衡计算结果表明：D1边坡整体上是稳定的，但在短暂工况下安全富余不足。（3）分析材料的参数变化对稳定性的影响。进行材料劣化对边坡稳定敏感性分析，进一步分析了地震对边坡稳定敏感性。（4）在以上分析的基础上研究合理的加固处理措施，并根据地质情况和初步加固方案，建立对应的计算模型，研究加固方案在各荷载组合下边坡的抗滑稳定性，评价加固方案的有效性和边坡的整体稳定性，并对开挖过程中边坡的稳定性进行分析，为边坡开挖及支护措施提供依据。
[Abstract]:D1 slope is a key slope in the landslide group of Toba reservoir area. It is located at the downstream of the initial dam axis on the left bank of Toba Hydropower Station and is close to the outlet of the power station at the downstream of the dam. The landslide body is about 430m long along the river with a distribution elevation of 1620m / 1845m, and the back edge boundary is arcuate. There are complete bedrock in the downstream side boundary, a gentle slope platform in the middle, leading edge extending to the riverbed, no bedrock outcropping along the edge line. The slope body has been lying down to the riverbed, and the riverbed has formed a strong reaction body, and the overall stability is good. The stability safety factor of the upper part of the sliding body is not high, especially under the condition of heavy rain (flood discharge atomization), the deformation is likely to occur, which seriously affects the operation and safety of the dam and the drainage structure. Therefore, the stability analysis and reinforcement of D1 slope have important theoretical significance and engineering value. In this paper, the limit equilibrium method is used to analyze the stability of the slope, and the proposed treatment measures are given. The main contents of the study are as follows: 1) through the geological investigation on the site of the project, the engineering geological conditions and the form of deformation and failure of the slope are found out, and the field in-situ test is carried out, and the physical and mechanical properties are obtained, and the mechanical parameters of the slope stability analysis are determined. 2) according to the limit equilibrium method, the stability analysis of four main landslide sections of D1 slope is carried out in this paper. The safety factors of each slope under the corresponding conditions can be obtained by calculating the control conditions which are divided into three types: lasting working condition, transient working condition and accidental working condition. The results of two-dimensional limit equilibrium calculation show that the slope is stable as a whole, but it is not safe enough under the transient condition. The influence of the material parameters on the stability is analyzed. The sensitivity of material deterioration to slope stability is analyzed, and the sensitivity of earthquake to slope stability is further analyzed. 4) on the basis of the above analysis, the reasonable reinforcement measures are studied, and according to the geological conditions and the preliminary reinforcement scheme, the corresponding calculation model is established, and the slope stability under various load combinations is studied. The effectiveness of the reinforcement scheme and the overall stability of the slope are evaluated, and the stability of the slope during the excavation process is analyzed, which provides the basis for the excavation and supporting measures of the slope.
【学位授予单位】：西北农林科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV223

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