Suction effects in deep Callovo-Oxfordian claystone

被引:16
作者
Delage, P. [1 ]
Menaceur, H. [1 ]
Tang, A. M. [1 ]
Talandier, J. [2 ]
机构
[1] Ecole Ponts ParisTech, Navier CERMES, Marne La Vallee, France
[2] ANDRA, Chatenay Malabry, France
关键词
clays; fabric/structure of soils; partial saturation; radioactive waste disposal; rocks/rock mechanics; suction;
D O I
10.1680/geolett.14.00062
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
An experimental programme was carried out with the aim of investigating suction effects in a specimen of Callovo-Oxfordian claystone extracted at great depth (479 m). A specimen that was saturated in an oedometer with limited swelling exhibited significant swelling and desaturation upon quick unloading at constant water content. The microstructure after unloading was compared with the initial microstructure based on mercury intrusion porosimetry measurements. Since the pore size distribution curves before and after loading appeared to be comparable in the range of pore sizes covered by mercury intrusion (entrance diameter between 363.6 mu m and 5.5 nm), it was concluded, based on microstructure considerations, that swelling occurred in pores with a diameter less than 5.5 nm, from water transfer within the clay matrix from inter-platelet to intra-platelet pores. This mechanism might occur when excavating galleries in areas of an excavation damaged zone that support instantaneous unloading sequences, as a first desaturation process prior to subsequent evaporation due to the ventilation of galleries.
引用
收藏
页码:267 / 271
页数:5
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