某水电站碾压混凝土坝三维非线性有限元分析
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摘要
针对厂坝联合、横缝灌浆和高地震烈度等特殊工程背景,采用三维非线性有限元方法,对某水电站碾压混凝土坝进行了应力变形分析和抗滑稳定分析。并采用超载法得出了大坝整体抗滑稳定安全系数。分析计算结果认为,各个工况下的应力变形的大小和分布规律基本合理,其抗滑稳定性总体上是有保证的。厂坝联合和横缝灌浆可以显著提高坝体整体的抗变形能力以及抗滑稳定性,提高坝体的整体抗震性能。
In order to improve the dam's global stability under the engineering background of high earthquake intensity and complicated geologic condition,the dam and power plant are combined together.The roller compacted concrete(RCC) dam's stress,displacement and stability against sliding are studied by three-dimensional elastoplastic finite element analysis.And the safety factor of global stability is got by overload method.The finite element calculation result shows that the value,including the distribution,of stress and displacement on dam is rational and the dam's stability against sliding is sound in the mass.Added to these,the result also shows that the engineering measures including transverse joint grouting and combination of hydropower plant and dam have greatly improved the capacity of resisting deformation,stability against sliding of the dam and its seismic restraint performance.
In order to improve the dam's global stability under the engineering background of high earthquake intensity and complicated geologic condition,the dam and power plant are combined together.The roller compacted concrete(RCC) dam's stress,displacement and stability against sliding are studied by three-dimensional elastoplastic finite element analysis.And the safety factor of global stability is got by overload method.The finite element calculation result shows that the value,including the distribution,of stress and displacement on dam is rational and the dam's stability against sliding is sound in the mass.Added to these,the result also shows that the engineering measures including transverse joint grouting and combination of hydropower plant and dam have greatly improved the capacity of resisting deformation,stability against sliding of the dam and its seismic restraint performance.
引文
[1]DL5073-2000.水工建筑物抗震设计规范[S].
[2]DL5108-1999混凝土重力坝设计规范[S].
[3]Zienkiewcz O C,Pande G W.Some useful forms ofisotropic yield surfaces for soil and rock mechanics[A].In:Pande G W ed.Finite Element in Geomechanics[C].Rotterdam:A.A.Balkema,1977,179-190.
[4]王鸿儒,李步娟,丁德平.复杂岩基三维弹塑性分析[J].岩土工程学报,1988,10(2):19-30.
[5]朱伯芳.有限单元法原理与应用(第二版)[M].北京:中国水利水电出版社,1998,490-492.
[6]肖明,余卫平.考虑温变荷载分析欧阳海薄拱坝的三维非线性有限元法[J].武汉大学学报(工学版),2001,34(1):31-36.
[7]余卫平,耿克勤,汪小刚.某水电站地下厂房洞室群围岩稳定分析[J].岩土力学,2004,25(12):1955-1960.
[8]余卫平,汪小刚,杨健,等.地下洞室群围岩稳定性分析及其结果的可视化[J].岩石力学与工程学报,2005,24(20):3730-3736.
[9]DL5077-1997.水工建筑物荷载设计规范[S].
[10]余卫平,肖明.复杂结构有限元网格组合剖分技术[J].武汉大学学报(工学版),2002,35(2):102-107.
[2]DL5108-1999混凝土重力坝设计规范[S].
[3]Zienkiewcz O C,Pande G W.Some useful forms ofisotropic yield surfaces for soil and rock mechanics[A].In:Pande G W ed.Finite Element in Geomechanics[C].Rotterdam:A.A.Balkema,1977,179-190.
[4]王鸿儒,李步娟,丁德平.复杂岩基三维弹塑性分析[J].岩土工程学报,1988,10(2):19-30.
[5]朱伯芳.有限单元法原理与应用(第二版)[M].北京:中国水利水电出版社,1998,490-492.
[6]肖明,余卫平.考虑温变荷载分析欧阳海薄拱坝的三维非线性有限元法[J].武汉大学学报(工学版),2001,34(1):31-36.
[7]余卫平,耿克勤,汪小刚.某水电站地下厂房洞室群围岩稳定分析[J].岩土力学,2004,25(12):1955-1960.
[8]余卫平,汪小刚,杨健,等.地下洞室群围岩稳定性分析及其结果的可视化[J].岩石力学与工程学报,2005,24(20):3730-3736.
[9]DL5077-1997.水工建筑物荷载设计规范[S].
[10]余卫平,肖明.复杂结构有限元网格组合剖分技术[J].武汉大学学报(工学版),2002,35(2):102-107.
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