云南某大型水電站地下廠房圍巖穩(wěn)定性研究
發(fā)布時間:2018-12-27 20:01
【摘要】:水電站地下洞室群深埋于巖體中,,由于地質(zhì)條件復雜,洞室縱橫交錯,布局復雜,研究地下洞室群圍巖穩(wěn)定性具有十分重要的意義。論文結合某大型水電站地下廠房,在深入分析地下洞室群圍巖工程地質(zhì)條件的基礎上,采用三維有限元方法,結合地下洞室群的施工開挖過程和支護方式,反演了地下洞室群圍巖的初始地應力場,分析了地應力場的成因及分布規(guī)律;分析了從施工開挖到支護全過程中,圍巖的變形、受力特征、屈服區(qū)以及圍巖的穩(wěn)定狀況,評價了地下廠房、主變室、尾水調(diào)壓室等主要洞室的圍巖穩(wěn)定性,論證了開挖方案的可行性,優(yōu)化并推薦了合理的支護參數(shù)、支護時機、施工開挖程序。成果為該工程的實施提供了科學的依據(jù)。
[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.
【學位授予單位】:吉林大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TV731.6;TV223
本文編號: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.
【學位授予單位】:吉林大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TV731.6;TV223
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