Use of the grain-size distribution for estimation of the soil-water characteristic curve

被引:237
作者
Fredlund, MD
Wilson, GW
Fredlund, DG
机构
[1] Univ Saskatchewan, Dept Civil Engn, Saskatoon, SK S7N 5A9, Canada
[2] SoilVis Syst Ltd, Saskatoon, SK S7J 1N3, Canada
[3] Univ British Columbia, Dept Min & Mineral Proc Engn, Vancouver, BC V6T 1Z4, Canada
关键词
soil-water characteristic curve; grain-size distribution; volume-mass properties; pedo-transfer function; unsaturated soil property functions;
D O I
10.1139/T02-049
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
The implementation of unsaturated soil mechanics into engineering practice is dependent, to a large extent, upon an ability to estimate unsaturated soil property functions. The soil-water characteristic curve (SWCC), along with the saturated soil properties, has proven to provide a satisfactory basis for estimating the permeability function and shear strength functions for an unsaturated soil. The volume change functions have not been totally defined nor applied in geotechnical engineering. The objective of this paper is to present a procedure for estimating the SWCC from information on the grain-size distribution and the volume-mass properties of a soil. SWCCs represent a continuous water content versus soil suction relationship. The proposed method provides an approximate means of estimating the desorption curve corresponding to a soil initially slurried near the liquid limit. The effects of stress history, fabric, confining pressure, and hysteresis are not addressed. A database of published data is used to verify the proposed procedure. The database contains independent measurements of the grain-size distribution and the SWCC. The level of fit between the estimated and measured SWCCs is analyzed statistically. The proposed procedure is compared to previously proposed methods for predicting the SWCC from the grain-size distribution. The results show that the proposed procedure is somewhat superior to previous methods.
引用
收藏
页码:1103 / 1117
页数:15
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