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Investigation on frost heave of saturated–unsaturated soils
Acta Geotechnica ( IF 5.7 ) Pub Date : 2020-03-13 , DOI: 10.1007/s11440-020-00952-6
Ruiqiang Bai , Yuanming Lai , Wansheng Pei , Mingyi Zhang

Frost heave is a process of coupled heat–water–mechanics, which refers to heat transfer, water migration, water–ice phase change, deformation, etc. The mechanism of the frost heave for saturated–unsaturated soils was investigated to establish a frost heave model. As the freezing continues, for saturated soils, because all pores are filled with pore water, the total increased volume due to water migration and water crystallization will separate soil particles and induce frost heave. For unsaturated soils, because of the existence of unsaturated pores, volume expansion generates by water and vapor migration and water–ice transition will firstly fill into the unsaturated pores until a critical state is reached. After that, further increased volume will separate soil particles and induce frost heave. Therefore, effective strain ratio was introduced to establish the relationship between frost heave strain of unsaturated soils and the fields of moisture and temperature. Tests were carried out for silty soil. Then, based on the inverse theory, a simplified criterion was proposed to determine the effective strain ratio, and the effective strain ratio was back-calculated according to the test results. Finally, an innovative universal frost heave model for saturated–unsaturated soils was proposed.



中文翻译:

饱和—非饱和土的冻胀研究

冻胀是热-水-力学耦合的过程,指的是传热,水迁移,水-冰相变,变形等。研究了冻胀在饱和-不饱和土壤中的机理,建立了冻胀模型。随着冻结的继续,对于饱和土壤,由于所有孔隙都充满了孔隙水,由于水的迁移和水的结晶而增加的总体积将分离土壤颗粒并引起冻胀。对于非饱和土壤,由于存在非饱和孔隙,水和水汽迁移会引起体积膨胀,水冰转变将首先填充非饱和孔隙,直到达到临界状态。之后,进一步增加的体积将分离土壤颗粒并引起冻胀。因此,通过引入有效应变比来建立非饱和土的冻胀应变与湿度和温度场之间的关系。对粉质土壤进行了测试。然后,基于逆理论,提出了确定有效应变比的简化准则,并根据测试结果对有效应变比进行了反算。最后,提出了一种针对饱和-非饱和土壤的创新通用冻胀模型。

更新日期:2020-03-13
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