高拱坝地震灾变破坏机理与溃坝仿真分析
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摘要
以天花板拱坝为例,应用三维可变形离散元程序(3DEC)及其强大的二次开发功能,充分考虑坝体—地基—库水系统的耦合作用、坝体缝面与坝肩裂隙岩体结构面在强震时错动、张合的非线性接触影响及远域地基能量逸散的辐射阻尼等因素,建立了符合实际工作性态的拱坝—地基系统地震破损失稳全过程的非线性数值分析模型,提出了判断拱坝系统由整体性遭受局部损坏到最终失效溃决的具有可操作性的工程指标和安全评价方法。实例应用结果表明,本文方法合理、有效。
Taking Tianhuaban high arch dam in domestic meizoseismal region for an example,a nonlinear numerical analysis model of damage and failure process of dam-foundation system is built by using 3D deformable distinct element method(3DEC) and its secondary development functions,which is accord with the actual workability state of arch dam.Dam foundation reservoir coupling effect,nonlinear contact influence of opening and closing of dam seam surfaces and abutment jointed rock structural planes during strong earthquake,and radiation damping of far field energy dissipation are considered in the analysis model.And operable engineering index and safety assessment methods are proposed to judge arch dam system disaster process from local damage to ultimate failure.The instance results show that the proposed method is reasonable and effective.
Taking Tianhuaban high arch dam in domestic meizoseismal region for an example,a nonlinear numerical analysis model of damage and failure process of dam-foundation system is built by using 3D deformable distinct element method(3DEC) and its secondary development functions,which is accord with the actual workability state of arch dam.Dam foundation reservoir coupling effect,nonlinear contact influence of opening and closing of dam seam surfaces and abutment jointed rock structural planes during strong earthquake,and radiation damping of far field energy dissipation are considered in the analysis model.And operable engineering index and safety assessment methods are proposed to judge arch dam system disaster process from local damage to ultimate failure.The instance results show that the proposed method is reasonable and effective.
引文
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[5]Zhang Chuhan,Pekau O A,Jin Feng,et al.Applica-tion of Distinct Element Method in Dynamic Analy-sis of High Rock Slopes and Blocky Structures[J].Soil Dynamics and Earthquake Engineering,1997,16(6):385-394.
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[2]涂劲,陈厚群,张伯艳.小湾拱坝在不同概率水平地震作用下的抗震安全性研究[J].水利学报,2006,37(3):278-285.
[3]张楚汉.论岩石、混凝土离散-接触-断裂分析[J].岩石力学与工程学报,2008,27(2):217-235.
[4]侯艳丽.砼坝—地基破坏的离散元方法与断裂力学的耦合模型研究[D].北京:清华大学,2005.
[5]Zhang Chuhan,Pekau O A,Jin Feng,et al.Applica-tion of Distinct Element Method in Dynamic Analy-sis of High Rock Slopes and Blocky Structures[J].Soil Dynamics and Earthquake Engineering,1997,16(6):385-394.
[6]Pekau O A,Cui Yuzhu.Failure Analysis of FracturedDams during Earthquakes by DEM[J].EngineeringStructures,2004,26(10):1 483-1 502.
[7]Cundall P A.The Measurement and Analysis of Ac-celeration in Rock Slopes[D].London:University ofLondon Imperial College of Science and Technolo-gy,1971.
[8]ITASCA Consulting Group Inc..Three-dimensionalDistinct Element Code,Version 3.0User’s Manual[Z].USA:ITASCA Consulting Group Inc.,2003.
[9]张冲,金峰,徐艳杰.拱坝-坝肩整体动力稳定分析方法研究[J].水力发电学报,2007,26(2):27-31,36.
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