Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (6): 1441-1452.doi: 10.16285/j.rsm.2021.2104

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Unimodal and bimodal soil-water characteristic curves model considering the effect of initial void ratio

GAO You1, LI Ze1, SUN De-an2, YU Hai-hao3, CHEN Bo4   

  1. 1. School of Civil and Environmental Engineering, Ningbo University, Ningbo, Zhejiang 315211, China; 2. Department of Civil Engineering, Shanghai University, Shanghai 200444, China; 3. Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin University of Technology, Guilin, Guangxi 541004, China; 4. College of Civil Engineering Architecture, Quzhou University, Quzhou, Zhejiang 324000, China
  • Received:2021-12-13 Revised:2022-03-24 Online:2022-06-21 Published:2022-06-29
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41902279), the Fundamental Research Funds for the Provincial Universities of Zhejiang (SJLY2022007) and the Natural Science Foundation of Zhejiang Province (LZY21D020001).

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Abstract: The pore size structure of soil specimen can be divided into unimodal, bimodal and even multimodal pore size distribution. The soil specimens with bimodal pore size structure usually show bimodal soil-water characteristic curve (SWCC). Many existing bimodal SWCC models are obtained through the method of segmented or superimposed based on the unimodal SWCC model. It is often difficult to accurately determine the relevant parameters at the intersection of two SWCCs, and the influence of void ratio on water characteristics of bimodal soil is seldom considered. In this paper, the characteristic of unimodal SWCCs and bimodal SWCCs with different initial void ratios in a wide suction range are analyzed and discussed in detail. Secondly, based on the above analysis of soil water characteristics and the two different mechanisms of adsorbed water and capillary water, the adsorption term equation is derived in the form of exponential function with the combination of Kelvin equation, and the capillary term equation is based on the modified Fredlund and Xing SWCC model. Finally, a bimodal SWCC model considering the effect of initial void ratio is proposed, and the proposed model is applicable to various soil types ranging from sands to silt and clayey soils.

Key words: unsaturated soil, soil-water characteristic curve, unimodality and bimodality, initial void ratio

CLC Number: 

  • TU411
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