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堆石体本构模型
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    The paper calculates the deformation and the stress of dam body and face for concrete faced rock fill dam with non-linear finite element method and taking Shenzhujiang model as rock fill body model.
    文中采用非线性有限元分析方法,并运用沈珠江模型作为堆石体本构模型对面板堆石坝坝体及面板做应力和变形计算。
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In large-scale triaxial compression test for rockfill material, shear dilatancy may have considerable contribution to the measured volume variation. Consequently the influence of the compression is usually overemphasized when model parameters are directly determined by test result. In this paper, a modified method for determining the volumetric model parameter based on large-scale compression test result is proposed. The method is applied to analyze the deformation of the Maopingxi Rockfill Dam. In the analysis,...

In large-scale triaxial compression test for rockfill material, shear dilatancy may have considerable contribution to the measured volume variation. Consequently the influence of the compression is usually overemphasized when model parameters are directly determined by test result. In this paper, a modified method for determining the volumetric model parameter based on large-scale compression test result is proposed. The method is applied to analyze the deformation of the Maopingxi Rockfill Dam. In the analysis, the uncoupled nonlinear KG model suggested by the Tsinghua University is applied. The comparison of numerical calculation result with in-situ monitoring data shows that the parameter correction according to the modified method remarkably improves the accuracy of the calculation of dam deformation.

在大坝堆石料大型三轴压缩试验中,剪胀变形在总的体积变形中占有相当大的比例,由其试验结果所确定的模型体变参数通常会夸大剪缩的影响。本文提出了用大型侧限压缩试验结果修正堆石料本构模型体变参数的方法,使用清华非线性解耦KG模型,以茅坪溪心墙堆石坝变形计算分析为例,介绍了大型侧限压缩试验成果在确定堆石体本构模型参数过程中的应用。通过与坝体变形实测结果的对比分析,证明使用经侧限压缩试验修正后的本构模型参数,可显著提高坝体变形的计算精度。

The paper calculates the deformation and the stress of dam body and face for concrete faced rock fill dam with non-linear finite element method and taking Shenzhujiang model as rock fill body model. On the basis of static calculation, the void question is studied by implicit element method through selection of easy void zone. The paper expounds and proves that FEM is a effective way for the simulation of concrete faced rock fill dam body void through the comparison between the deflection and stress of concrete...

The paper calculates the deformation and the stress of dam body and face for concrete faced rock fill dam with non-linear finite element method and taking Shenzhujiang model as rock fill body model. On the basis of static calculation, the void question is studied by implicit element method through selection of easy void zone. The paper expounds and proves that FEM is a effective way for the simulation of concrete faced rock fill dam body void through the comparison between the deflection and stress of concrete face and the ordinary law of faced rock fill dam.

文中采用非线性有限元分析方法,并运用沈珠江模型作为堆石体本构模型对面板堆石坝坝体及面板做应力和变形计算。在静力计算的基础上,选择容易产生脱空的区域进行模拟脱空,主要运用隐单元方法来进行脱空问题研究,对面板的挠度和应力与面板坝的一般规律比较并做一定的分析,来论证利用有限元仿真模拟坝体脱空是一种有效的途径。

The paper makes three-dimensional finite element analysis and calculates the deformation of dam body taking Xianliuxia rockfill dam with face slab as the example,studies the rockfill creepage with the mathematics,the mechamics and the dam theory on the basis of the principle for constitutive model of rockfill dam and non-linear finite element of rockfill dam with face slab,gets the dam deformation law in different time,forecasts the working state of dam in long-term and obtains useful conclusion.

本文结合拟建的下六甲面板堆石坝工程实例,对该坝进行三维非线性有限元分析,计算研究了坝体变形。在综合阐述堆石体的本构模型和面板堆石坝非线性有限元基本原理的基础上,运用数学、力学和坝工理论研究堆石的蠕变,得到坝体在不同时期的变形规律,预测了坝体长期的工作性态,从而得到一些有意义的结论。

 
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