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Mathematical Modeling of Rheological Properties of Clays and Clay Rocks
Journal of Engineering Physics and Thermophysics, 2003A mathematical model of the rheological properties of water-saturated clays has been considered. The model is built upon the combination of the theory of filtrational consolidation and the theory of stability of lyophobe colloids, which is based on the concept of disjoining pressure as excess pressure compared to the hydraulic one which is due to ...
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Clay Mineral Formation in Weathered Rocks: Water/Rock Interaction
2008The greatest part of the geological formations are altered when outcropping. Formed under temperature, pressure and chemical conditions different from those prevailing at the interface with the atmosphere, the rocks are transformed into a softer material.
Bruce Velde, Alain Meunier
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Isotope Geochemistry of Clays and Clay Minerals from Sedimentary Rocks
1995Authigenic clay minerals are records of a long and complex history of the sediments since their deposition. These minerals can be broadly classified as either syn-depositional or post-depositional, but the distinction between them in an ancient sedimentary rock is not always easy.
Norbert Clauer, Sambhu Chaudhuri
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A clay grouting technique for granitic rock adjacent to clay bulkhead
Physics and Chemistry of the Earth, Parts A/B/C, 2007Abstract Excavation and re-distribution of the stress around the tunnel lead to the development of an excavation damage zone (EDZ). While the bulkheads are keyed into the rock wall of the tunnel to act as cut-offs for the EDZ of the tunnel, clay grouting was conducted around the clay bulkhead as an additional measure to interrupt the connectivity of ...
K. Masumoto +5 more
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Assessment of clay soils and clay-rich rock for clogging of TBMs
Tunnelling and Underground Space Technology, 2016Abstract Shield tunnel drives in both, overconsolidated clays soils and sedimentary rock with clay minerals, frequently suffer extremely from hindrance due to clogging. The problem of clogging can have varying degrees, from locally blocked disk cutter housings to completely clogged excavation chambers with a blocked cutterhead.
Markus Thewes, Fritz Hollmann
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1997
Abstract Rocks and cohesive clays form a high proportion of the world’s coasts, and even many sand and coarse elastic beaches are underlain by shore platforms and backed by marine cliffs. These coasts have been neglected in the contemporary processoriented coastal literature, where the emphasis has been on beaches and other coastal ...
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Abstract Rocks and cohesive clays form a high proportion of the world’s coasts, and even many sand and coarse elastic beaches are underlain by shore platforms and backed by marine cliffs. These coasts have been neglected in the contemporary processoriented coastal literature, where the emphasis has been on beaches and other coastal ...
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On damage modelling in unsaturated clay rocks
Physics and Chemistry of the Earth, Parts A/B/C, 2008The aim of this paper is to present the main problems encountered in the modelling of damage in an unsaturated quasi-brittle rock mass. Micromechanical damage models are based on a physical definition of damage, related to fracturing. Phenomenological formulations are less straightforward, but offer huge modelling possibilities by means of economical ...
Arson, Chloé, Gatmiri, Behrouz
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Origin of clay films in rock salt
Sedimentary Geology, 1985Abstract It has long been assumed that thin but pervasive clay intercalations in evaporite deposits of salt and potash represent “freshening” of the brine body, i.e. dilution by fresh or low-salinity water. However, a corresponding amount of coarser clastics is not present: sandy halites are extremely rare, sandy potash beds are unknown.
P. Sonnenfeld, P.P. Hudec
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Nanoscale Simulations of Rock and Clay Minerals
Advances in Measurement and Modeling of Soil Behavior, 2007Nanomechanics has huge possibilities in explaining basic materials response such as creep, friction, rate and temperature dependency. Constitutive models based on nanomechanics have distinct advantages over phenomological models in simulating the response of geomaterials under extreme environments.
Jianfeng Wang +2 more
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Sorption of radionuclides onto natural clay rocks
Radiochimica Acta, 2008AbstractReactions of U(VI) and Eu/Cm(III) with natural clay rock (Opalinus Clay, Switzerland, and Callovo-Oxfordian Clay, France) are investigated by batch and spectroscopic experiments as well as geochemical calculations. The aim of the studies is to identify those minerals in the heterogeneous multiphase systems with sometimes high calcite content ...
Hartmann, E. +4 more
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