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NUMERICAL MODEL VALIDATION FOR LARGE CONCRETE GRAVITY DAMS

机译：大重力重力坝的数值模型验证

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摘要

The interaction effects between a large concrete gravity dam, its foundation, and impounded reservoir have been investigated using 2-D and 3-D finite element representations validated against field measurements. Field tests conducted on the dam provided acceleration profiles across the dam crest and along the dam-foundation interface, and were used to assess material properties in the dam and in the foundation. Field measurements of hydrodynamic pressures acquired along the upstream dam face were used to evaluate the relative accuracy of various techniques for representing the reservoir water in the numerical model of the dam-foundation-reservoir system. Techniques for representing the reservoir water included the Westergaard added mass approach, the RSVR2 approach, fluid elements modeled as plane strain elements with the properties of water and acoustic elements. Comparisons of measured and computed acceleration and hydrodynamic pressure frequency responses were obtained that illustrate the advantages and limitations associated with each modeling approach. The paper provides relevant details associated with the field tests on the dam, presents an overview of the numerical models, and discusses the assumptions used in developing the reservoir representations. Frequency responses are compared to highlight model performance. These results will be used to validate numerical models of the dam-foundation-reservoir system in support of an ongoing risk-based performance evaluation for this dam.
机译：大型混凝土重力坝，其基础与蓄水库之间的相互作用已通过使用经现场测量验证的2D和3D有限元表示法进行了研究。在大坝上进行的现场测试提供了跨大坝顶以及沿大坝-基础界面的加速度曲线，并用于评估大坝和地基中的材料特性。沿上游坝面采集的水动力压力的现场测量被用于评估在坝基-水库系统数值模型中代表水库水的各种技术的相对精度。表示储层水的技术包括Westergaard附加质量法，RSVR2方法，建模为具有水和声学特性的平面应变单元的流体单元。获得了测量和计算的加速度和流体动力压力频率响应的比较，这些响应说明了每种建模方法的优点和局限性。本文提供了与大坝现场测试相关的详细信息，概述了数值模型，并讨论了用于开发水库表示形式的假设。比较频率响应以突出显示模型性能。这些结果将用于验证大坝基础-水库系统的数值模型，以支持对该大坝进行基于风险的持续性能评估。

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