کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
809814 1468725 2011 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Oedometric compression and swelling behaviour of the Callovo-Oxfordian argillite
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
پیش نمایش صفحه اول مقاله
Oedometric compression and swelling behaviour of the Callovo-Oxfordian argillite
چکیده انگلیسی

The Callovo-Oxfordian (COx) argillite is a possible host rock for radioactive waste disposal in which the ANDRA underground laboratory of Bure (East of France) has been excavated. In this paper some aspects of the volume change behaviour of the COx argillite are investigated. To do so, high pressure oedometers with a maximum capacity of 113 MPa have been used. In a first stage, swelling tests were carried out on samples initially compressed at constant initial water content (unsaturated) that were afterwards soaked under vertical loads, respectively, smaller and higher than the in-situ vertical stress. All samples exhibited swelling, even at stress higher than the in-situ stress. In a second stage, standard step-loading compression tests were carried out on samples previously saturated under the in-situ vertical load, so as to investigate the volume change behaviour under load cycles. The strain–stress curves obtained appear to be different to what is currently observed in overconsolidated or cemented clays, with no clear appearance of yield and pre-yield reversible behaviour. The volumetric behaviour during both compaction and swelling is interpreted in terms of damage created by the collapse of pores within a fragile matrix. The amount of swelling observed is related to the extent of damage.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Rock Mechanics and Mining Sciences - Volume 48, Issue 4, June 2011, Pages 606–615
نویسندگان
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