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A. Nguyen Van Nghia Jougnot Damien Thanh Luong Duy Van Do Phan Thuy Tran Thi Chung Hue Dang Thi Minh Hung Nguyen Manh 《Hydrogeology Journal》2021,29(6):2017-2031
Hydrogeology Journal - Predicting the permeability of porous media in saturated and partially saturated conditions is of crucial importance in many geo-engineering areas, from water resources to... 相似文献
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The transient diffusion of cationic and anionic tracers through clay-rocks is usually modeled with parameters like porosity, tortuosity (and/or constrictivity), sorption coefficients, and anionic exclusion. Recently, a new pore scale model has been developed by Revil and Linde [Revil A. and Linde N. (2006) Chemico-electromechanical coupling in microporous media. J. Colloid Interface Sci.302, 682-694]. This model is based on a volume-averaging approach of the Nernst-Planck equation. The influence of the electrical diffuse layer is accounted for by a generalized Donnan equilibrium model through the whole connected pore space that is valid for a multicomponent electrolyte. This new model can be used to determine the composition of the pore water of the Callovo-Oxfordian clay-rock, the osmotic efficiency of bentonite as a function of salinity, the osmotic pressure, and the streaming potential coupling coefficient of clay-rocks. This pore scale model is used here to model the transient diffusion of ionic tracers (22Na+, 36Cl−, and ) through the Callovo-Oxfordian clay-rock. Speciation of shows that ∼1/3 of the SO4 is tied-up in different complexes. Some of these complexes are neutral and are therefore only influence by the tortuosity of the pore space. Using experimental data from the literature, we show that all the parameters required to model the flux of ionic tracers (especially the mean electrical potential of the pore space and the formation factor) are in agreement with independent evaluations of these parameters using the osmotic pressure determined from in situ pressure measurements and HTO diffusion experiments. 相似文献
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C. Gélis A. Revil M. E. Cushing D. Jougnot F. Lemeille J. Cabrera A. De Hoyos M. Rocher 《Pure and Applied Geophysics》2010,167(11):1405-1418
The Experimental platform of Tournemire (Aveyron, France) developed by IRSN (French Institute for Radiological Protection
and Nuclear Safety) is located in a tunnel excavated in a clay–rock formation interbedded between two limestone formations.
A well-identified regional fault crosscuts this subhorizontal sedimentary succession, and a subvertical secondary fault zone
is intercepted in the clay–rock by drifts and boreholes in the tunnel at a depth of about 250 m. A 2D electrical resistivity
survey was carried out along a 2.5 km baseline, and a takeout of 40 m was used to assess the potential of this method to detect
faults from the ground surface. In the 300 m-thick zone investigated by the survey, electrical resistivity images reveal several
subvertical low-resistivity discontinuities. One of these discontinuities corresponds to the position of the Cernon fault,
a major regional fault. One of the subvertical conductive discontinuities crossing the upper limestone formation is consistent
with the prolongation towards the ground surface of the secondary fault zone identified in the clay–rock formation from the
tunnel. Moreover, this secondary fault zone corresponds to the upward prolongation of a subvertical fault identified in the
lower limestone using a 3D high-resolution seismic reflection survey. This type of large-scale electrical resistivity survey
is therefore a useful tool for identifying faults in superficial layers from the ground surface and is complementary to 3D
seismic reflection surveys. 相似文献
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