Effects of partial saturation on the collapse and swelling of geo-materials (Effets de la saturation partielle sur l'effondrement et le gonflement des géo-materiaux)

部分饱和对地质材料塌陷和膨胀的影响 (Effets de la satielle sur leffondrement et le gonflement des géo-materiaux)

• 批准号: 402299-2011
• 负责人: Nuth, Mathieu
• 金额: $ 1.82万
• 依托单位: Université de Sherbrooke
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=488011
• 关键词: Effects; partial; saturation; collapse; swelling

- Most of the soils found in civil engineering practice are partially saturated with water. In unsaturated soils, the suction is the pore pressure deficiency between the air pressure in the pores of the soil and the interstitial water pressure. Suction is at the origin of bonding forces between the soil particles which means that capillarity has a cohesive effect. Unsaturated soils possess a better resistance and a higher rigidity compared with saturated soils. The engineering properties of the soil thus depend on suction and moisture. The laboratory characterization of the improved geotechnical properties of unsaturated soils has progressed recently. Laboratory tests are now designed to integrate both the volume and suction control. Conceptual interpretation of the observed behavior have also been proposed and led to practical tools for the numerical simulation of engineering problems.

- 在土木工程实践中发现的大多数土壤都是部分饱和的。在非饱和土壤中，吸力是土壤孔隙中的空气压力与孔隙水压力之间的孔隙压力差。吸力是土壤颗粒之间的结合力的来源，这意味着毛细作用具有内聚效应。与饱和土相比，非饱和土具有更好的抗力和更高的刚度。因此，土壤的工程性质取决于吸力和湿度。非饱和土土工特性改善的实验室表征最近取得了进展。实验室测试现在被设计成将体积和吸力控制结合在一起。观察到的行为的概念解释也被提出，并导致工程问题的数值模拟的实用工具。