期刊
COMPUTERS AND GEOTECHNICS
卷 57, 期 -, 页码 85-96出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compgeo.2014.01.004
关键词
Soil water characteristic curve; Dual-porosity; Permeability function; Unsaturated soil; Grain-size distribution
类别
资金
- National Basic Research Program of China 973 Program [2012CB026104]
- National Natural Science Foundation of China [51109003, 51379053]
Experimental evidence shows that a gap-graded soil or a widely-graded granular material may have a bimodal soil-water characteristic curve (SWCC) and a bimodal permeability function. A bimodal SWCC or a bimodal permeability function originates from a dual-porosity structure. To date, the prediction of bimodal SWCCs for gap-graded soils is still a difficult task. In this paper, a bimodal SWCC model is proposed to describe the drying process of granular soils considering a dual-porosity structure. The new SWCC model shows powerful capability in fitting the SWCCs for soils varying from gravel to silt. Regression analysis is conducted to establish empirical relations between the model parameters and the indexes of soil grain-size distribution (GSD). Based on these relations, the new model predicts well both the bimodal SWCCs for gap-graded soils and the unimodal SWCCs for well-graded soils and uniform soils. A bimodal permeability function is also proposed and linked to the new SWCC model. In the absence of experimental SWCCs and permeability functions, the new model can be used to obtain preliminary SWCCs and permeability functions for granular soils. It should be mentioned that the prediction of the SWCC from the GSD is still empirical and does not address the cyclic wetting/drying process. Measurement of the SWCC should be performed wherever an accurate SWCC is required. (C) 2014 Elsevier Ltd. All rights reserved.
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