| 张昭,刘奉银,赵旭光,周冬.考虑应力引起孔隙比变化的土水特征曲线模型[J].水利学报,2013,44(5): |
| 考虑应力引起孔隙比变化的土水特征曲线模型 |
| A soil water characteristic curve model considering void ratio variation with stress |
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| DOI： |
| 中文关键词: 非饱和土 土水特征曲线 孔隙比 应力 本构关系 |
| 英文关键词: unsaturated soils soil water characteristic curve void ratio stress constitutive relationship |
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| 中文摘要: |
| 土水特征曲线在非饱和土力学中扮演着非常重要的角色，它已在岩土工程和环境岩土工程得到广泛应用。利用GCTS土水特征曲线仪，测定了无压和一定固结压力下的非饱和黄土土水特征曲线，引入“水土体积比”对已有文献中Saskatchewan粉土、Indian Head冰碛土和黄土的土水特征曲线数据进行分析，结果发现水土体积比随基质吸力的变化在一定应力所致孔隙比（预先固结和固结所致）和基质吸力范围内可归结为一条曲线。基于此认识，对van Genuchten模型进行改进，提出了一种考虑应力引起孔隙比变化的土水特征曲线模型，并验证了该模型的正确性，为研究非饱和土的力-水耦合本构关系提供了一条新思路。 |
| 英文摘要: |
| Soil water characteristic curve plays a significant role in unsaturated soil mechanics， geotechnical and geoenvironmental engineering. A series of soil water characteristic tests for remoulded loess specimens under no stress state and certain consolidation stress states. For Xi’an loess and Saskatchewan silt，Indian Head till in the past literatures， the result shows that the evolutions of water-solid volumetric ratio with matric suction can be normalized by a single curve in the certain consolidation or preconsolidation void ratio ranges. A new model considering void ratio variation with stress is proposed based on van Genuchten model. In addition， the model can not only be in good accordance with the test data， but also provide a new insight into the hydro-mechanical constitutive relationship for unsaturated soils. |
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