考虑土料动力特性参数围压依赖性的高土石坝动力反应分析
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摘要
堆石坝筑坝材料的动力特性参数对围压有较强的依赖性,在高坝动力响应分析中采用某一围压下的参数将导致明显的误差。本文利用非线性静力有限元法确定坝体各单元震前有效围压;然后利用各填筑土料在不同固结围压下的动力试验结果,对坝体内各土体单元按震前有效应力进行线性插值或外延得到各单元动力特性参数随应变幅的归一化曲线,最后,采用动力等价线性有限元法确定坝体的动力响应。经过多种方案计算结果的对比分析,表明综合考虑高土石坝应力分布的特点和填筑土料动力特性参数随应变幅变化规律的围压依赖性可较准确地评价高土石坝等价线性振动体系的加速度、动力特性参数的分布、永久变形等坝体动力响应及抗震性能评价指标。
Since the material dynamic properties of rockfill are strongly dependent on the confining pressure,the adoption of material parameters for single confining pressure in dynamic response analysis for high rockfill dam may result in significant error.An improved approach taking the effect of confining pressure and stress distribution into account is proposed.In this approach the confining-pressure-interpolating curves are introduced to determine the nonlinear properties of each rockfill element based on test data by linear interpolation or extrapolation.Then,the dynamic equivalent linear FEM is applied to determine the dynamic response of dam.The comparison of calculation results show that the approach comprehensively considering the effects of stress distribution and the dependency of material dynamic parameters variation on confining pressure gives the more accurate assessment of the acceleration,dynamic parameters distribution and permanent deformation as well as the aseismic performance index of the rockfill dam.
Since the material dynamic properties of rockfill are strongly dependent on the confining pressure,the adoption of material parameters for single confining pressure in dynamic response analysis for high rockfill dam may result in significant error.An improved approach taking the effect of confining pressure and stress distribution into account is proposed.In this approach the confining-pressure-interpolating curves are introduced to determine the nonlinear properties of each rockfill element based on test data by linear interpolation or extrapolation.Then,the dynamic equivalent linear FEM is applied to determine the dynamic response of dam.The comparison of calculation results show that the approach comprehensively considering the effects of stress distribution and the dependency of material dynamic parameters variation on confining pressure gives the more accurate assessment of the acceleration,dynamic parameters distribution and permanent deformation as well as the aseismic performance index of the rockfill dam.
引文
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[15]国家电力公司成都勘测设计院.四川省大渡河长河坝水电站预可行性研究报告[R].四川:成都勘测设计院,2005.
[2]周建平,杨泽艳,陈观福.我国高坝建设的现状和面临的挑战[J].水利学报,2006,37(12):1433-1438.
[3]汪闻韶.汪闻韶院士土工问题论文选集[M].北京:中国建筑工业出版社,1999.
[4]沈珠江,徐刚.堆石料的动力变形特性[J].水利水电科学研究,1996,(6):143-150.
[5]韩国城,孔宪京,栾茂田,等.粗粒料动应力-应变关系试验研究[R].大连:大连理工大学,1995.
[6]韩国城,孔宪京,栾茂田,等.动耦合分析及抗震结构形式与工程措施研究[R].大连:大连理工大学,2000.
[7]栾茂田,吴兴征,阴吉英.堆石料动力特性参数对面板堆石坝三维非线性地震响应的影响[J].水力发电学报,2001,(1):7-18.
[8]陈国兴,谢君斐,张克绪.土的动模量和阻尼比的经验估计[J].地震工程与工程振动,1995,15(1):73-84.
[9]Hardin B O,Drnevich V P.Shear modulus and damping in soils:measurement and parameter effects[J].J.SoilMechanics and Foundations Division,ASCE,1972,98(SM6):603-624.
[10]Seed H B,Idriss I M.Soil Moduli and Damping Factors for Dynamic Response Analysis[R].Report No.UCB/EERC-70/10,Earthquake Engineering Research Center,University of Berkeley,Berkeley,CA,1970.
[11]Darendelli M B.A New Family of Normalized Modulus Reduction and Material Damping Curves[D].PhD Dissertation,University of Texas at Austin,2001.
[12]郑娅娜,党发宁,尹小涛.深厚覆盖层上高土石坝的动力反应特性研究[J].西安理工大学学报,2005,(1):59-63.
[13]中国水利水电科学研究院.长河坝水电站可行性研究阶段坝料动力特性试验研究[R].北京:中国水利水电科学研究院,2006.
[14]大连理工大学.长河坝水电站砾石土心墙堆石坝动力有限元分析[R].大连:大连理工大学,2006.
[15]国家电力公司成都勘测设计院.四川省大渡河长河坝水电站预可行性研究报告[R].四川:成都勘测设计院,2005.
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