猴子岩水电站左岸导流洞进口边坡稳定性研究
发布时间：2018-08-12 16:52
【摘要】：为实现中华民族的伟大复兴奠定坚实的物质基础，进入新世纪以来，我国各级政府加大了对水电事业的开发力度，水电站的修建过程中，各类边坡稳定性的问题和治理变得不容忽视。由于川藏之间特殊的地形地貌，高崖陡壁，深切河谷遍布，各类自然边坡和工程边坡的稳定性评价、破坏模式和破坏过程分析显得尤其重要。猴子岩水电站导流洞进口边坡就是这类边坡中的一个。由于导流洞完成导流作用之后将被改造成泄洪洞，并非一个临时工程，所以导流洞边坡的稳定性对整个工程的正常运行有非常重要的意义。 本文以猴子岩水电站左岸导流洞进口边坡为主要研究对象，在调查、收集、分析坝址区的区域地理环境条件、地层岩性、地质构造、水文地质的基础上，着重分析了导流洞边坡区的地层岩性、地质构造、水文地质，并深入分析了导流洞进口边坡的岩体结构特征，包括岩石特性、结构面特征和形状。在这些工作的基础上，分析了边坡开挖后可能的破坏模式和潜在滑动面，本文采用刚体极限平衡法，以Slide软件为工具，对潜在滑动面进行安全系数计算，并利用离散元软件UDEC模拟自然边坡变形情况和开挖破坏动态过程以及支护后变形分析，最后利用计算结果给出支护改良建议。具体内容如下： 结合野外地质调查资料，比较全面的总结了猴子岩水电站导流洞进口边坡的岩体结构特征，并且初步建立了地质模型。将边坡岩体质量分为Ⅲ、Ⅳ类，同时将边坡结构面分为Ⅱ、Ⅲ、Ⅳ类结构面，对其形状特征进行了详细的描述。详细阐述了研究区的岩体变形特征，并分析了其成因机制。 通过上述的工程地质分析，详细分析了可能失稳的不利块体的组合模式，并且采用Slide软件，利用极限平衡法分析了各不利组合模式的稳定性，给出了具体的安全系数。计算结果表明：以断层面Fs-1为后缘拉裂面，岩层层面为底滑面的滑动模式和以断层面fs-2为后缘拉裂面，岩层层面为底滑面的滑动模式稳定性最差。 采用UDEC软件对边坡变形破坏的动态过程进行数值模拟，分别从应力、应变、位移、塑性区分布等方面分析边坡在不同阶段的变形特征，模拟边坡在不加固的情况下开挖的动态破坏过程。最后分析了边坡在边开挖边加固的工况下不同开挖阶段的变形特征，根据计算结果判断边坡需要进一步加固，，给出加固方案：在原始加固方案的基础上，进行开挖第五级边坡的加固。
[Abstract]:In order to establish a solid material foundation for the great rejuvenation of the Chinese nation, since the beginning of the new century, our governments at all levels have stepped up the development of hydropower projects, and in the process of construction of hydropower stations, All kinds of slope stability problems and treatment become not to be ignored. Because of the special landform between Sichuan and Tibet, high cliffs and steep walls, deep valleys all over, it is very important to evaluate the stability of all kinds of natural slopes and engineering slopes, and to analyze the failure mode and failure process. The inlet slope of diversion tunnel in monkey rock hydropower station is one of these slopes. Since the diversion tunnel will be transformed into a flood discharge tunnel after the diversion effect is completed, it is not a temporary project, so the stability of the diversion tunnel slope is very important to the normal operation of the whole project. Taking the inlet slope of diversion tunnel on the left bank of Xianyan Hydropower Station as the main research object, on the basis of investigation, collection and analysis of the regional geographical environment conditions, stratigraphic lithology, geological structure and hydrogeology in the dam site area, The stratigraphic lithology, geological structure and hydrogeology of the diversion tunnel slope are emphatically analyzed, and the rock mass structure characteristics, including rock characteristics, structural plane characteristics and shape of the inlet slope of the diversion tunnel are analyzed in depth. On the basis of these works, the possible failure mode and potential sliding surface after slope excavation are analyzed. In this paper, the safety factor of potential sliding surface is calculated by using rigid body limit equilibrium method and Slide software. The discrete element software UDEC is used to simulate the deformation of natural slope, the dynamic process of excavation failure and the analysis of post-support deformation. Finally, suggestions for improvement of support are given by using the calculation results. The concrete contents are as follows: combined with the field geological survey data, the rock mass structure characteristics of the inlet slope of diversion tunnel in the Monaoyan Hydropower Station are summarized comprehensively, and the geological model is established preliminarily. The rock mass quality of slope is divided into 鈪
本文编号：2179670
[Abstract]:In order to establish a solid material foundation for the great rejuvenation of the Chinese nation, since the beginning of the new century, our governments at all levels have stepped up the development of hydropower projects, and in the process of construction of hydropower stations, All kinds of slope stability problems and treatment become not to be ignored. Because of the special landform between Sichuan and Tibet, high cliffs and steep walls, deep valleys all over, it is very important to evaluate the stability of all kinds of natural slopes and engineering slopes, and to analyze the failure mode and failure process. The inlet slope of diversion tunnel in monkey rock hydropower station is one of these slopes. Since the diversion tunnel will be transformed into a flood discharge tunnel after the diversion effect is completed, it is not a temporary project, so the stability of the diversion tunnel slope is very important to the normal operation of the whole project. Taking the inlet slope of diversion tunnel on the left bank of Xianyan Hydropower Station as the main research object, on the basis of investigation, collection and analysis of the regional geographical environment conditions, stratigraphic lithology, geological structure and hydrogeology in the dam site area, The stratigraphic lithology, geological structure and hydrogeology of the diversion tunnel slope are emphatically analyzed, and the rock mass structure characteristics, including rock characteristics, structural plane characteristics and shape of the inlet slope of the diversion tunnel are analyzed in depth. On the basis of these works, the possible failure mode and potential sliding surface after slope excavation are analyzed. In this paper, the safety factor of potential sliding surface is calculated by using rigid body limit equilibrium method and Slide software. The discrete element software UDEC is used to simulate the deformation of natural slope, the dynamic process of excavation failure and the analysis of post-support deformation. Finally, suggestions for improvement of support are given by using the calculation results. The concrete contents are as follows: combined with the field geological survey data, the rock mass structure characteristics of the inlet slope of diversion tunnel in the Monaoyan Hydropower Station are summarized comprehensively, and the geological model is established preliminarily. The rock mass quality of slope is divided into 鈪
本文编号：2179670
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