云南某大型水电站地下厂房围岩稳定性研究
发布时间：2018-12-27 20:01
【摘要】：水电站地下洞室群深埋于岩体中，，由于地质条件复杂，洞室纵横交错，布局复杂，研究地下洞室群围岩稳定性具有十分重要的意义。论文结合某大型水电站地下厂房，在深入分析地下洞室群围岩工程地质条件的基础上，采用三维有限元方法，结合地下洞室群的施工开挖过程和支护方式，反演了地下洞室群围岩的初始地应力场，分析了地应力场的成因及分布规律；分析了从施工开挖到支护全过程中，围岩的变形、受力特征、屈服区以及围岩的稳定状况，评价了地下厂房、主变室、尾水调压室等主要洞室的围岩稳定性，论证了开挖方案的可行性，优化并推荐了合理的支护参数、支护时机、施工开挖程序。成果为该工程的实施提供了科学的依据。
[Abstract]:The underground cavern group of hydropower station is deeply buried in the rock mass. Because of the complex geological conditions, the interlaced caverns and the complicated layout, it is of great significance to study the stability of the surrounding rock mass of the underground cavern group. On the basis of deep analysis of engineering geological conditions of surrounding rock of underground cavern group, this paper combines with underground powerhouse of a large hydropower station, adopts three-dimensional finite element method, and combines the excavation process and supporting method of underground cavern group. The initial in-situ stress field of surrounding rock of underground cavern group is inversed, and the origin and distribution law of in-situ stress field are analyzed. This paper analyzes the deformation, stress characteristics, yield zone and stability of surrounding rock during the whole process from excavation to support, and evaluates the stability of main caverns such as underground powerhouse, main transformer chamber, tailrace surge chamber, etc. This paper demonstrates the feasibility of the excavation scheme, optimizes and recommends the reasonable support parameters, the timbering timing and the construction excavation procedure. The results provide a scientific basis for the implementation of the project.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV731.6;TV223
本文编号：2393534
[Abstract]:The underground cavern group of hydropower station is deeply buried in the rock mass. Because of the complex geological conditions, the interlaced caverns and the complicated layout, it is of great significance to study the stability of the surrounding rock mass of the underground cavern group. On the basis of deep analysis of engineering geological conditions of surrounding rock of underground cavern group, this paper combines with underground powerhouse of a large hydropower station, adopts three-dimensional finite element method, and combines the excavation process and supporting method of underground cavern group. The initial in-situ stress field of surrounding rock of underground cavern group is inversed, and the origin and distribution law of in-situ stress field are analyzed. This paper analyzes the deformation, stress characteristics, yield zone and stability of surrounding rock during the whole process from excavation to support, and evaluates the stability of main caverns such as underground powerhouse, main transformer chamber, tailrace surge chamber, etc. This paper demonstrates the feasibility of the excavation scheme, optimizes and recommends the reasonable support parameters, the timbering timing and the construction excavation procedure. The results provide a scientific basis for the implementation of the project.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV731.6;TV223
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