| 饱和度对非饱和土力学性质的影响 |
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| 引用本文： | 孙德安.饱和度对非饱和土力学性质的影响[J].岩土力学,2009,30(Z2):13-16. |
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| 作者姓名： | 孙德安 |
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| 作者单位： | 上海大学,土木工程系,上海,200072 |
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| 基金项目： | 国家自然科学基金项目 |
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| 摘 要： | 现在被广泛公认的由Fredlund提出的非饱和土力学的双参数理论,即净应力和吸力为非饱和土的应力状态量,不能直接考虑饱和度或含水率对非饱和土的应力-应变关系和强度的影响.在非饱和土三轴试验结果表明,即使在净应力和吸力路径相同的条件下,具有不同饱和度试样的应力-应变关系和强度也是不同的.其他条件相同时,试样饱和度越高,其应力比-应变关系曲线越高,强度越大.最新的水力-力学特性耦合的弹塑性本构模型可以定量地表示上述非饱和土的性质.
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| 关 键 词： | 非饱和土 应力状态量 饱和度 三轴试验 |
| 收稿时间： | 2009-07-30 |
Effect of saturation degree on mechanical behaviours of unsaturated soils |
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| SUN De-an.Effect of saturation degree on mechanical behaviours of unsaturated soils[J].Rock and Soil Mechanics,2009,30(Z2):13-16. |
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| Authors: | SUN De-an |
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| Institution: | Department of Civil Engineering, Shanghai University, Shanghai 200072, China |
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| Abstract: | A widely accepted two-parameter theory proposed by Fredlund for unsaturated soils uses the net stress and suction as stress-state variables; it cannot consider the effect of saturation degree or water content on the stress-strain behaviour and strength of unsaturated soils directly. The triaxial test results show that even if the path of net stress and the suction are the same, the stress-strain relation and strength are different due to different saturation degrees. While other conditions are the same, the higher the saturation degree of the specimen, the higher the stress ratio versus strain relation. The latest elastoplastic constitutive model coupling hydraulic and mechanical behaviours could quantitatively reproduce the above behaviours of unsaturated soils. |
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| Keywords: | unsaturated soil stress state variable saturation degree triaxial test |
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