地震条件下亭子口重力坝深层滑动失稳模式研究
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摘要
针对地震条件下重力坝深层滑动失稳模式确定的问题,以亭子口重力坝为工程背景,采用了以静力条件下大坝深层滑动失稳模式为基础,综合模型试验与数值分析、定量分析与定性分析成果的方法进行了研究。获得了亭子口重力坝地震条件下深层滑动可能的3种失稳模式,并结合局部与整体稳定安全系数的分析,可知大坝安全度最低的动力滑动模式为:齿槽上游侧拉裂,坝体连带部分基岩沿齿槽底部软弱岩层和泥化夹层JS2-1-2的组合滑面滑动。
For searching the sliding failure mode of Tingzikou gravity dam along deep-seated weak planes under seismic condition,a program based on consequences under static conditions and results of model experiment,numerical analysis,quantitative and qualitative analysis was used. Three possible paths of sliding were acquired and the emergency capacity of different sliding paths was gained. The most probable failure path was proved to be the combination of cracked upstream face of the tooth,weak rock layer under the tooth and the muddy layer marked as JS2-1-2 downstream the tooth.
For searching the sliding failure mode of Tingzikou gravity dam along deep-seated weak planes under seismic condition,a program based on consequences under static conditions and results of model experiment,numerical analysis,quantitative and qualitative analysis was used. Three possible paths of sliding were acquired and the emergency capacity of different sliding paths was gained. The most probable failure path was proved to be the combination of cracked upstream face of the tooth,weak rock layer under the tooth and the muddy layer marked as JS2-1-2 downstream the tooth.
引文
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[2]张楚汉,金峰,侯艳丽,等.岩石和混凝土离散-接触-断裂分析[M].北京:清华大学出版社,2008:523-534.
[3]Shen Huaizhi,Zhang Chuhan,Jin Feng.Performance-based stability evaluation of earthquake induced sliding along the interface between dam and foundation for concrete gravity dams[J].Journal of Hydroelectric Engineering,2009,28(1):137-142.[沈怀至,张楚汉,金峰.基于性能的重力坝坝基交界面地震抗滑稳定评价[J].水力发电学报,2009,28(1):137-142.]
[4]Huang Cheng,Ren Weizhong.Time-history analysis of seismic sliding stability of concrete gravity dam for Ahai hydropower station at Jinsha River[J].Rock and Soil Mechanics,2011,32(4):1101-1107.[黄诚,任伟中.金沙江阿海水电站混凝土重力坝地震抗滑稳定性的时程法分析[J].岩土力学,2011,32(4):1101-1107.]
[5]Chávez J W,Fenves G L.Earthquake response of concrete gravity dams including base sliding[J].Journal of Structure Engineering,1995,121(5):865-875.
[6]Mir R A,Taylor C A.An investigation into the base sliding response of rigid concrete gravity dams to dynamic loading[J].Earthquake Engineering Structural Dynamics,1998,25(1):79-98.
[7]Basili M,Nuti C.Seismic simulation and base sliding of concrete gravity dams[J].Computational Methods in Earthquake Engineering,2011,21:427-454.
[8]Jiang Xiaolan,Sun Shaowen,Zhu Jiebing.Model test of stability against deep sliding in Tingzikou dam[J].Journal of Yangtze River Scientific Research Institute,2010,27(9):65-69.[姜小兰,孙绍文,朱洁兵.亭子口大坝深层抗滑稳定试验研究[J].长江科学院院报,2010,27(9):65-69.]
[9]Wan Biao,He Yunlong,Xiong Kun.Development of joint element with thickness and its application[J].Water Resources and Power,2008,26(4):63-66.[万彪,何蕴龙,熊堃.有厚度节理单元的开发与应用[J].水电能源科学,2008,26(4):63-66.]
[10]Zhou Ze,Zhou Feng,Pan Junxiao,et al.Study on stability against deep sliding of gravity dam[J].Rock and Soil Mechanics,2008,29(6):1719-1722.[周泽,周峰,潘军校,等.重力坝深层抗滑稳定计算探讨[J].岩土力学,2008,29(6):1719-1722.]
[11]潘家铮.重力坝设计[M].北京:水利电力出版社,1987.
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