Stability against sliding in intake dam section of Yangtze River Three Gorges Project
Stability against sliding in intake dam section of Yangtze River Three Gorges Project
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DOI：
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发表时间：
2006
影响因子：
1.5
通讯作者：
Su Huai-zhi
中科院分区：
文献类型：
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作者：
Su Huai-zhi
1#基础基岩向下游发育有多条缓倾长大裂隙，少数为中倾裂隙，长江三峡工程左厂房5个坝段高边坡节理构成深层滑动和稳定问题，根据实测的长缓倾角和大缓倾角分布情况，归纳出各坝段的滑动模式本文从工程结构措施、深层抗滑稳定分析、观测资料分析等方面对1 -5号单元坝的抗滑稳定性进行了研究，对左进水口坝段1 -5号坝段的深层抗滑稳定性采用刚体极限平衡法进行分析，以上结果表明，左岸进水口坝段1 -5号坝段刚体极限平衡Kc′值满足稳定安全要求，其它分析方法的Kc′值为：有限元分析3.0-4.5或以上，3.5-4.2地质力学模型试验，以刚性极限平衡为主，多种分析方法为辅的滑动模式稳定性分析表明，1-左岸进水口坝段1 -5号坝段基础的水平变形较小，垂直变形较小，坝基岩体的抗滑稳定性较好。未出现不均匀沉降，坝基稳定。
Lots of long and large fissures with slight slope and few with medium slope towards the downstream in the bedrock of the foundation of No.1-5 dam units of the left powerhouse of the Yangtze Three Gorges Project constitute the problems of the deep layer slide and stability by the joints of the high slope.The modes of sliding of various monoliths are generalized based on the distribution of the measured long and large gentle inclination structural faces.In addition,two kinds of hypothetical and extreme sliding models were proposed.This paper researches the slide and stability of the No.1-5 units dam from the aspects of engineering structural measures,analysis of deep stability against sliding,analysis for observed data.The rigid limit equilibrium is used for analysis of deep stability against sliding in the No.1-5 monoliths of the left intake dam section,which is accompanied by FEM numerical analyses and geo-mechanical model tests.The results above show that the Kc′ values derived from the rigid limit equilibrium of the No.1-5 monoliths of the left bank intake dam section meet the requirements for stability safety.The values by other analysis methods are: 3.0-4.5 or above for FEM analysis,3.5-4.2 for geo-mechanical model test.The stability analysis of the sliding modes dominated by rigid limit equilibrium and supplemented by various other analysis methods indicates that after engineering structural measures taken for the No.1-5 monoliths of the left bank intake dam section,guarantee has been provided for the stability against sliding of the dam and its foundation rocks.Analysis of observations shows that for the foundations of No.1-5 monoliths of the left bank intake dam section,horizontal deformation is little;vertical deformation is undersized;asymmetric settlement does not appear.The dam foundation is stable.