燕云水电站重力坝坝基渗透稳定影响分析
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摘要
以拟建燕云水电站重力坝为例,采用有限元法计算了坝基在水位下降过程中的应力应变特性,研究了在水位下降过程中坝基破坏模式、抗滑稳定系数、渗流场和坝基垂直有效应力分布等4个方面的变化趋势。结果表明:上游水位下降对该重力坝坝基破坏模式影响显著,上游水位较高时为表层滑动,死水位时为浅层滑动;水位下降还将导致重力坝抗滑稳定系数增大,坝基最大渗流速度和渗漏量也逐渐降低,坝基防渗墙底部最大垂直有效应力逐渐增大,坝趾垂直有效应力则逐渐减小,坝踵应力水平均较低,不存在受拉现象,满足规范要求。研究成果对工程建设的顺利开展有一定指导意义。
In order to study the foundation stability influence of gravity dam when upstream water level dropped, taking the Yanyun hydropower station dam as an example, the stress and strain characteristics of dam foundation in the process of water level decline is calculated by finite element method,we research four aspects of change trends during the water level decline: dam failure mode, the anti sliding stability, seepage field and the stress distribution of dam foundation vertical effective stress. The results show that the upstream water level decreased has significant influence on the dam foundation failure mode, the surface is sliding when the upstream water level higher, the shallow is sliding when at the dead water level; water level decline will lead to increase the anti sliding stability coefficient of gravity dam, dam foundation seepage and leakage rate is gradually reduced, the maximum vertical effective stress gradually increase at the bottom of the dam foundation impervious wall, the dam toe vertical effective stress decreases, the dam heel stress level was low, but there is no tension phenomenon, can meet the requirements of specification. The research results have certain guiding significance for the smooth development of engineering construction.
In order to study the foundation stability influence of gravity dam when upstream water level dropped, taking the Yanyun hydropower station dam as an example, the stress and strain characteristics of dam foundation in the process of water level decline is calculated by finite element method,we research four aspects of change trends during the water level decline: dam failure mode, the anti sliding stability, seepage field and the stress distribution of dam foundation vertical effective stress. The results show that the upstream water level decreased has significant influence on the dam foundation failure mode, the surface is sliding when the upstream water level higher, the shallow is sliding when at the dead water level; water level decline will lead to increase the anti sliding stability coefficient of gravity dam, dam foundation seepage and leakage rate is gradually reduced, the maximum vertical effective stress gradually increase at the bottom of the dam foundation impervious wall, the dam toe vertical effective stress decreases, the dam heel stress level was low, but there is no tension phenomenon, can meet the requirements of specification. The research results have certain guiding significance for the smooth development of engineering construction.
引文
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[2]赵振兴,何建京.水力学[M].北京:清华大学出版社,2010.
[3]DRUCKER D C,PRAGER W.Soil mechanics and plastic analysis in limit design[J].Quarterly of Applied Mathematics,1952,10(2):157-165.
[4]汪亚超,方国宝,陈小虎,等.混凝土重力坝抗滑稳定实时分析方法[J].人民长江,2013,44(20):37-41.
[5]卢坤林,朱大勇.武都水库坝基深层抗滑稳定性评价中BD角的合理取值[J].水利水电科技进展,2012,32(3):35-38.
[6]吴杰芳,张林让,陈震.混凝土重力坝深层抗震抗滑稳定分析研究[J].长江科学院院报,2010,27(6):58-61.
[7]田娟娟.基于有限元强度折减法的复杂地基重力坝抗滑稳定分析[J].甘肃水利水电技术,2016,52(5):26-30.
[8]王河,王志鹏,李永刚.基于有限元超载—折减综合法的重力坝深层抗滑稳定性分析[J].水电能源科学,2016,34(2):65-68.
[9]孙伟,庞俊蕊,苏龙,等.重力坝深层抗滑稳定强度折减弹塑性有限元法[J].人民黄河,2014,36(1):107-108.
[10]ZIENKIEWICS O C,HUMPHESON C,LEWIS R W.Associated and non-associated visco-plasticity and Plasticity in soil mechanics[J].Geotechnique,1975,25(4):671-689.
[11]刘树林,强菲,聂守智.勉县地质灾害分布与影响因素的相关性分析[J].水利与建筑工程学报,2017,15(1):165-170.
[12]赵川,刘小容.碎石土压重对基坑边坡稳定性影响数值模拟[J].水利科技与经济,2016,22(12):57-59.
[13]宋丹青.水库蓄水对库岸边坡稳定性的影响[J].水资源与水工程学报,2015,26(5):192-196.