Experimental study of the hydro-mechanical behaviour of the Callovo-Oxfordian argillite

摘要: Various laboratory experiments were carried out in the framework of MODEX-REP project on Callovo-Oxfordian argillite core samples taken from Meuse/Haute-Marne Underground Research Laboratory (MHM-URL) Eastern France to provide basic data for modelling hydro-mechanical response shaft sinking. The short-term mechanical behaviour was investigated by means uniaxial and triaxial compression tests, whereas long-term studied creep relaxation tests. Some influence factors such as material anisotropy, scale effect, water content sample origin examined. Permeability determined wet dry specimens parallel perpendicular bedding plane using gas under different confining pressures. With regard behaviour, anisotropy effects observed. compressive strength failure strain air-dried are about two times higher than those saturated ones. No lower limit, no significant effect pure found. region argillaceous formation is relatively homogeneous. permeability one order magnitude that decreases with increasing pressure content.