| 缪林昌,刘松玉.南阳膨胀土的水分特征和强度特性研究[J].水利学报,2002,33(7):0087-0092 |
| 南阳膨胀土的水分特征和强度特性研究 |
| Soil-water characteristics and shear strength of expansive soil |
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| DOI： |
| 中文关键词: 膨胀土 水分特征曲线 吸力 吸力强度 双曲模型 |
| 英文关键词: expansive soil soil-water characteristic curve suction suction strength hyperbolic model |
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| 中文摘要: |
| 膨胀土是一种特殊疑难土，随含水量变化具有吸水膨胀脱水收缩的特征，膨胀土的力学特性受含水量或基质吸力的强烈影响，含水量与基质吸力的关系可用水分特征曲线来描述。本文对南阳膨胀土的水分特征进行了试验研究，结果表明：膨胀土的水分迁移与它的初始应力状态有关，干湿循环数对无压饱和土样的水分迁移有较大影响，对有压饱和土样的水分迁移影响较小。有预压力的水分特征曲线受干湿循环的影响较小，能较好地反映膨胀土的土水特征。同时研究了不同吸力状态下非饱和膨胀土的强度特性，并提出了计算吸力强度的双曲模型，该双曲模型能较好地描述吸力对强度的贡献，模型适用性强，参数易于确定，便于在工程实践中应用。 |
| 英文摘要: |
| The soil-water characteristics of expansive soil are studied experimentally.It is found that the transport of water in soil is closely related to the initial stress state and the wetting-drying cycles greatly affect the water transport in the saturated un-pressured soil specimen but will not affect the pressured specimen. The influence of wetting-drying cycles on soil-water characteristics is small,in case the specimen is pre-pressured.The strength features of unsaturated expansive soil under different suction state are also investigated.A hyperbolic model of the suction strength is proposed, which is convenient to engineering practice. |
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