Influence of microfabric evolution on the retention behaviour of compacted clayey soils

被引:0
作者
Dieudonne, A. C. [1 ,2 ]
Della Vecchia, G. [3 ]
Charlier, R. [1 ]
Jommi, C. [4 ]
机构
[1] Univ Liege, Liege, Belgium
[2] Fond Rech Sci FNRS, FRIA, Brussels, Belgium
[3] Politecn Milan, I-20133 Milan, Italy
[4] Delft Univ Technol, Delft, Netherlands
来源
UNSATURATED SOILS: RESEARCH & APPLICATIONS, VOLS 1 AND 2 | 2014年
关键词
PORE-SIZE DISTRIBUTION; WATER-RETENTION; MICROSTRUCTURE; POROSITY; SILT;
D O I
暂无
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
After compaction, clayey soils exhibit an evident bimodal Pore Size Density function (PSD). The two classes of pores are usually addressed as intra-aggregate and inter-aggregate porosity: these structural levels interact each other and show different behaviours along hydro-mechanical paths. In this paper selected experimental data of pore size density function, obtained by mercury intrusion porosimetry tests on different clayey soils are analysed and modelled by means of van Genuchten analytical expression. Different evolution patterns for PSD parameters are identified for intra- and interaggregate pores. The consequences on the water retention properties are analysed by means of a simple double structure retention model, which links pore size to suction through Laplace equation. The model is able to explicitly take into account the influence of water content and void ratio changes on the pore size evolution of the two structural levels. As a consequence, the specific hydro-mechanical paths induced by water retention testing can be followed and the influence of void ratio variation and of the applied stress can be predicted. Water retention data collected during a specific test are thus interpreted and modelled as the envelope of different water retention states, each of them corresponding to a specific fabric. The water retention model is finally validated against experimental data.
引用
收藏
页码:679 / 684
页数:6
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