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Determinationofelasticmodulus of claystone:Nano-/micro-indentation andmeso-compression tests used to investigate impact of alkaline fluid propagation over 18 years

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第3期9卷 129-136页

作者： Danièle Bartier christophe auvray GeoRessources UMR 7359 Université de Lorraine CNRS CREGU Campus Aiguillettes Vandoeuvre-les-Nancy 54500 France

Micro-mechanical properties of a claystone were tested after undergoing alkaline perturbation on site(Tournemire,CD borehole)for 18 *** a saturated context and outside the excavation disturbed zone(EDZ),the claystone exhibits a 11.6-mm black rim at the cement/paste interface,which shows a different mechanical behaviour from the rest of the *** sets of measurements of elastic modulus were performed using:(i)nano-indentation tests with a constant indentation depth of 2 mm,(ii)microindentation tests with a constant indentation depth of 20 mm,and(iii)meso-compression tests with a constant displacement of 200 *** increase of the modulus of deformability in the black rim is between 15 GPa and 20 GPa according to the ***,an overall decrease of the modulus of deformability from the smallest to the largest scale is observed in each *** view of the mineralogy and petrographic observations,higher values of modulus of deformability in the black rim are related to carbonate content and its *** of cementitious carbonates as inclusions and very thin partings leads to hardening of the claystone.

关键词： Claystone Elastic modulus Nano-indentation Micro-indentation Meso-compression Carbonate Claystone/cement paste contact

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Elastic modulus of claystone evaluated by nano-/micro-indentation tests and meso-compression tests

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第1期9卷 84-91页

作者： christophe auvray Noémie Lafrance Danièle Bartier Université de Lorraine CNRS CREGU Lab. GeoRessources UMR 7359 Vandoeuvre-lès-Nancy F-54518 France

Toarcian claystone such as that of the Callovo-Oxfordian is a qualified multiphase material. The claystone samples tested in this study are composed of four main mineral phases: silicates(clay minerals, quartz,feldspars, micas)(z86%), sulphides(pyrite)(z3%), carbonates(calcite, dolomite)(z10%) and organic kerogen(z1%). Three sets of measurements of the modulus of deformability were compared as determined in(i) nanoindentation tests with a constant indentation depth of 2 mm,(ii) micro-indentation tests with a constant indentation depth of 20 mm, and(iii) meso-compression tests with a constant displacement of 200 mm. These three experimental methods have already been validated in earlier studies. The main objective of this study is to demonstrate the influence of the scaling effect on the modulus of deformability of the material. Different frequency distributions of the modulus of deformability were obtained at the different sample scales:(i) in nano-indentation tests, the distribution was spread between 15 GPa and 90 GPa and contained one peak at34 GPa and another at 51 GPa;(ii) in the micro-indentation tests, the distribution was spread between 25 GPa and 60 GPa and displayed peaks at 26 GPa and 37 GPa; and(iii) in the meso-compression tests, a narrow frequency distribution was obtained, ranging from 25 GPa to 50 GPa and with a maximum at around 35 GPa.

关键词： Claystone Elastic modulus Scaling effect Nano-and micro-indentation Meso-compression tests Multi-scale mechanical tests

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