X-ray microtomography characterisation of the changes in statistical homogeneity of an unsaturated sand during imbibition

被引：19

作者：

Bruchon, J. -F. ^{[1
]}

Pereira, J. -M. ^{[1
]}

Vandamme, M. ^{[1
]}

Lenoir, N. ^{[1
]}

Delage, P. ^{[1
]}

Bornert, M. ^{[1
]}

机构：

[1] Univ Paris Est, Lab Navier UMR 8205, CNRS, ENPC,IFSTTAR, Marne La Vallee, France

来源：

GEOTECHNIQUE LETTERS | 2013年 / 3卷

关键词：

partial saturation; pore pressures; sand; statistical analysis;

D O I：

10.1680/geolett.13.00013

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

This paper deals with determination of the size of the representative volume element (RVE) of an unsaturated sand specimen and its evolution during wetting. An imbibition test was conducted in an oedometer cell while stepwise reducing the capillary pressure by using the negative water column technique. X-ray tomography scans were acquired at each equilibrium state and three-dimensional images of a partial volume of the specimen were processed. Characterisation of the sample's homogeneity was based on the asymptotic behaviour method for three quantities of interest: the air fraction and the median diameters of both the air and the water-grain phases obtained from Matheron's granulometry. It is shown that the RVE size depends on the choice of the quantity of interest and evolves with the saturation state.

引用

页码：84 / 88

页数：5

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