| 殷宗泽,张坤勇,朱俊高.面板堆石坝应力变形计算中考虑土的各向异性[J].水利学报,2004,35(11):0022-0026 |
| 面板堆石坝应力变形计算中考虑土的各向异性 |
| Computation for stress and deformation of concrete slab in rock-fill dam in consideration of soil anisotropy |
| 投稿时间：2003-08-11 |
| DOI： |
| 中文关键词: 本构模型 土石坝 各向异性 改进的模型 |
| 英文关键词: constitutive model earth and rockfill dam anisotropy modified model |
| 基金项目:国家自然科学基金(50079004) |
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| 中文摘要: |
| 土体本构模型一般都将土体作为各向同性材料，应用于混凝土面板堆石坝应力变形计算时常带来不小的误差，本文以双曲线模型为例剖析了计算中存在的问题。该模型假定从大主应力方向加荷与从小主应力方向加荷弹性模量和泊松比都相同，但真三轴仪试验表明两者有显著差异。混凝土面板中的应力是水荷载引起的，而水荷载沿坝体的小主应力方向施加，无论弹性模量还是泊松比，与荷载从大主应力方向施加都有很大的不同。各向同性的本构模型忽略了它们的差异，仅仅用大主应力方向加荷的方法来确定弹性模量和泊松比，必然会有较大误差，对混凝土面板来说就可能是不能容许的误差。文中提出了一种考虑各向异性的本构模型，它是以E-ν模型为基础，作了某些修正处理。用其对面板坝进行计算，面板应力有明显改善。 |
| 英文摘要: |
| In most of soil constitutive models, the soil is taken as isotropic material. This may result in significant error in stress and deformation computation for concrete slab in rock-fill dam. In this paper, the hyperbolic model is taken as an example to demonstrate the cause inducing the error. In this model the Young's modulus and Poisson's ratio do not change regardless of the loading is applied from major principal stress direction or from minor principal stress direction. Actually it is not the true. The isotropic models neglect this difference and only use the parameters obtained from the tests in which loading is applied from major principal direction, thus resulted in magnificent error in computation result of concrete slab stress and deformation. A modified model in consideration of the anisotropy is developed. The computational result shows that the stress and deformation by means of this new model is more reasonable. |
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