Pore-pressure cycling experiments on Mx80 Bentonite

Study of convergence confinement method curves considering pore-pressure effect

The design of underground spaces is mainly carried out using empirical, analytical, and numerical methods. The convergence confinement method (CCM) is an analytical technique that is widely utilized in analyzing the stability of underground spaces. However, the main challenge in the stability analysis is the selection of an accurate constitutive model for rock mass, and particularly, its post-f...

Radiation pressure force from optical cycling on a polyatomic molecule

We demonstrate multiple photon cycling and radiative force deflection on the triatomic free radical strontium monohydroxide (SrOH). Optical cycling is achieved on SrOH in a cryogenic buffer-gas beam by employing the rotationally closed ( )  = P N 1 branch of the vibronic transition ̃ ( ) ̃ ( ) S « P + X A 000 000 2 2 1 2 . A single repumping laser excites the Sr–O stretching vibrational mode, ...

Bentonite landslides.

Modeling Diffusion of an Alkaline Plume in a Clay Barrier

The design of clay plugs used for sealing access galleries to a radioactive waste repository built with concrete structures in a deep clayey formation must take into consideration their chemical evolution over time. Diffusion of an alkaline plume from concrete into bentonite was therefore modeled over a 100,000-year period with the PHREEQC geochemical code in order to determine, as a function o...

Characterization of Pore to Pore Diffusive Exchange Using Nmr T2-store-t2 2d Experiments

Low field NMR T2 distribution is an efficient tool for characterizing pore size distribution in porous media. For multimodal systems, a new technique called T2-storeT2 allows the analysis of diffusional pore to pore exchange that is extremely useful for the characterization of connectivity. This technique uses 2D inverse Laplace techniques and produces T2-T2 maps. Qualitatively, a system is cou...