Physics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22.1009k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 9, p. 1009-1012
Physics
9
Dehydration, Earth Crust, Embrittlement, Fluid Pressure, Gypsum, Mechanical Properties, Porosity, Permeability, Pressure Distribution, Rock Mechanics
Scientific paper
Dehydration reactions can induce excess pore-fluid pressures that are high enough to effect the mechanical strength and ductility of rocks. Laboratory experiments were conducted to investigate this phenomenon in dehydrating rocks with porosities that are initially negligible but increase as the reaction progresses. Polycrystalline gypsum samples were first heated under pressure to induce dehydration, then axially loaded after different amounts of reaction. Within the first 1% of reaction, the ultimate strength of the sample decreased and embrittlement was observed. The ultimate stregth recovered within 3% of reaction and eventually exceeded that of pure gypsum. Results indicate that the initial weakening and embrittlement correpond to a pulse of excess pore pressure in the sample interior. Subsequently strengthening is caused by a decrease in pore pressure and the higher strength of the product phase.
Briegel Ueli
Ko Suz-Chung
Olgaard David L.
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