岩基断层对混凝土重力坝地震响应的影响分析
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摘要
为探讨岩基中断层对混凝土重力坝响应的影响规律,根据正交实验设计原理,采用基于有限单元法的振型分解反应谱法,分析单组断层的倾角、厚度、弹性模量、泊松比、与坝体相对位置等多种因素对混凝土重力坝地震响应的影响规律。研究表明,影响因素的强弱顺序依次断层的倾角、与坝体相对位置、弹性模量、厚度及泊松比。在含断层岩基的重力坝抗震设计中,应着重考虑断层的倾角、与坝体相对位置对重力坝的影响。
In order to explore the influences of the faults in rock foundation on the seismic response of concrete gravity dam,the influences caused by the factors of fault dip,thickness,elastic modulus,Poisson's ratio and relative position to dam are studied respectively by using FEM-based modal response spectrum method according to orthogonal experimental design theory.The results show that the factors having influence to seismic response by strong to weak order is dip,relative position to dam,elastic modulus,thickness and Poisson's ratio.The fault dip and relative position to dam should be emphatically considered in the aseismic design of gravity dam which founds on the rock base with faults.
In order to explore the influences of the faults in rock foundation on the seismic response of concrete gravity dam,the influences caused by the factors of fault dip,thickness,elastic modulus,Poisson's ratio and relative position to dam are studied respectively by using FEM-based modal response spectrum method according to orthogonal experimental design theory.The results show that the factors having influence to seismic response by strong to weak order is dip,relative position to dam,elastic modulus,thickness and Poisson's ratio.The fault dip and relative position to dam should be emphatically considered in the aseismic design of gravity dam which founds on the rock base with faults.
引文
[1]陈厚群,徐泽平,李敏.汶川大地震和大坝抗震安全[J].水利学报,2008,39(10):1158-1167.
[2]宋恩来.云峰大坝缓倾角断层坝段抗滑稳定分析[J].大坝与安全,2009(1):46-51.
[3]李仕栋,罗奇峰.不同倾角断层对场地动力放大效应的分析[J].地震研究,2004,27(3):283-286.
[4]徐卫亚,江涛,赵志峰.光照重力坝坝基断层影响及处理的三维数值模拟[J].岩石力学与工程学报,2006,25(6):1009-1105.
[5]杜建国,林皋,谢清粮.无限地基中断层对混凝土大坝地震响应的影响[J].长江科学院院报,2009,26(3):40-43.
[6]SL203—97水工建筑物抗震设计规范[S].
[7]燕柳斌,李海,张焕岭.长垌双曲拱坝有限元等效应力计算研究[J].广西大学学报,2009,34(2):123-126.
[8]姬振豫.正交设计的方法与理论[M].香港:世界科技出版社,2001.
[2]宋恩来.云峰大坝缓倾角断层坝段抗滑稳定分析[J].大坝与安全,2009(1):46-51.
[3]李仕栋,罗奇峰.不同倾角断层对场地动力放大效应的分析[J].地震研究,2004,27(3):283-286.
[4]徐卫亚,江涛,赵志峰.光照重力坝坝基断层影响及处理的三维数值模拟[J].岩石力学与工程学报,2006,25(6):1009-1105.
[5]杜建国,林皋,谢清粮.无限地基中断层对混凝土大坝地震响应的影响[J].长江科学院院报,2009,26(3):40-43.
[6]SL203—97水工建筑物抗震设计规范[S].
[7]燕柳斌,李海,张焕岭.长垌双曲拱坝有限元等效应力计算研究[J].广西大学学报,2009,34(2):123-126.
[8]姬振豫.正交设计的方法与理论[M].香港:世界科技出版社,2001.
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