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Effect of water chemistry on the hydro-mechanical behaviour of compacted mixtures of claystone and Na/Ca-bentonites for deep geological repositories

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第2期14卷 527-536页

作者： Zhixiong Zeng Yu-Jun Cui Jean Talandier Laboratoire Navier/CERMES Ecole des Ponts ParisTechMarne La Vallée77455France French National Radioactive Waste Management Agency(Andra) Châtenay-Malabry92298France

In the French deep geological disposal for radioactive wastes,compacted bentonite/claystone mixtures have been considered as possible sealing *** emplacement in place,such mixtures are hydrated by the site solution as well as the cement solution produced by the degradation of *** this study,the effects of synthetic site solution and cement solution on the hydro-mechanical behaviour of compacted mixtures of claystone and two types of bentonites(MX80 Na-bentonite and Sardinia Cabentonite)were investigated by carrying out a series of swelling pressure,hydraulic conductivity and mercury intrusion porosimetry(MIP)*** was found that for the MX80 bentonite/claystone mixture hydrated with synthetic site solution,the swelling capacity was reduced compared to the case with deionised water owing to the transformation of Na-montmorillonite to multi-cation dominant montmorillonite by cation *** the Sardinia bentonite/claystone mixture,the similar increasing rate of swelling pressure was observed during the crystalline swelling process for different solutions,suggesting insignificant cation ***,the cations in the synthetic site solution could reduce the thickness of diffuse double layer and the osmotic swelling for both MX80 bentonite/claystone and Sardinia bentonite/claystone *** large-pore volume increased consequently and enhanced water *** the cement solution,the hydroxide could also dissolve the montmorillonite,reducing the swelling pressure,and increase the large-pore volume,facilitating the water ***,the decrease of swelling pressure and the increase of hydraulic conductivity were more significant in the case of low dry density because of more intensive interaction between montmorillonite and hydroxide due to the high permeability.

关键词： bentonite/claystone mixture Synthetic site solution Cement solution bentonite type Swelling pressure Hydraulic conductivity

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