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基于拟静力法的大岗山坝肩边坡地震工况稳定性分析
引用本文:刘杰,李建林,张玉灯,屈建军,李剑武,李映霞.基于拟静力法的大岗山坝肩边坡地震工况稳定性分析[J].岩石力学与工程学报,2009,28(8):1562-1570.
作者姓名:刘杰  李建林  张玉灯  屈建军  李剑武  李映霞
作者单位:(1. 三峡大学 土木水电学院,湖北 宜昌 443002;2. 三峡大学 三峡库区地质灾害教育部重点实验室,湖北 宜昌 443002;;3. 中国水电顾问集团 贵阳勘测设计研究院,贵州 贵阳 550002)
基金项目:国家自然科学基金资助项目,湖北省自然科学基金计划项目,三峡大学校基金资助项目 
摘    要: 以目前国内设计地震烈度最大的水电站工程——大岗山坝肩边坡工程为实例,根据规范,选用拟静力法对坝肩边坡地震工况下的稳定性进行分析,并对该方法进行相应改进。基于合理的边坡岩体参数、锚固参数和地震参数,对坡体在不同地震加速度下的应力、应变、塑性区及锚索应力进行研究。指出不同剖面地质条件下,不同烈度下边坡关键点位移随边坡高度的变化规律,同时得到不同剖面地震作用的主要影响区域(敏感区域)和地震中塑性区随地震加速度的演化规律,提出相应滑移模式,为支护提供依据。分析认为,考虑50 a超越概率5%的地震加速度时,边坡的V类岩体和表面坡积物及岩脉γL5,γL6,XL316–1,XL9–15,β6处有较大塑性区,并呈贯通趋势。分析指出V类岩体分层线及岩脉XL316–1,XL9–15对岩坡稳定性有着重要的影响,建议调整V类岩体参数并进一步查明岩脉XL316–1,XL9–15的分布情况及连通率。

关 键 词:岩石力学坝肩边坡拟静力法塑性区演化规律
收稿时间:2009-4-21
修稿时间:2009-5-19

STABILITY ANALYSIS OF DAGANGSHAN DAM ABUTMENT SLOPE UNDER EARTHQUAKE BASED ON PSEUDO-STATIC METHOD
LIU Jie,LI Jianlin,ZHANG Yudeng,QU Jianjun,LI Jianwu,LI Yingxia.STABILITY ANALYSIS OF DAGANGSHAN DAM ABUTMENT SLOPE UNDER EARTHQUAKE BASED ON PSEUDO-STATIC METHOD[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(8):1562-1570.
Authors:LIU Jie  LI Jianlin  ZHANG Yudeng  QU Jianjun  LI Jianwu  LI Yingxia
Affiliation:(1. College of Civil and Hydropower Engineering,China Three Gorges University,Yichang,Hubei 443002,China;;2. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area,Ministry of Education,China Three Gorges University,Yichang,Hubei 443002,China;3. HydroChina Guiyang Engineering Corporation,Guiyang,Guizhou 550002,China)
Abstract:The general engineering situation of an abutment slope located in the complex area of Dagangshan Hydropower Station with the maximum design and check seismic intensity at present in China is introduced. According to relative regulations,the pseudo-static method is selected to analyze the stability of Dagangshan dam abutment slope under earthquake;and the method has been improved correspondingly. Based on reasonable rock mass parameters,anchoring parameters and seismic parameters of slope,the stress,strain,plastic zone of the slope under different earthquake accelerations and the cable¢s stress are studied. Then the variation laws of displacement of critical points changing with slope height under different geological conditions and seismic intensities are pointed out;and the main affected area(sensitive area) of different sections under earthquake,the evolutionary laws of plastic zone in the process of earthquake and the corresponding slip modes are obtained,which could offer references for supports. It is considered that,under the earthquake acceleration with 5% exceeding probability in the next 50 years,large plastic area appears in the rock grade V,accumulation body and the areas with rock dikes γL5,γL6,XL316–1,XL9–15 and β6. The plastic areas become larger and show a tendency of transfixion. It is shown that layers in the rock grade V and rock dikes XL316–1,XL9–15 are important for stability of rock slope. It is also suggested that parameters of rock grade V needs to be adjusted so as to further ascertain the distribution and connectivity rate of rock dikes XL316–1,XL9–15.
Keywords:rock mechanics  abutment slope  pseudo-static method  plastic zone  evolutionary law
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