Topic
Pore water pressure
About: Pore water pressure is a research topic. Over the lifetime, 11455 publications have been published within this topic receiving 247670 citations. The topic is also known as: pwp.
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TL;DR: In this article, the freezing/melting behavior of pore water is studied and it is shown that the freezing and melting behavior is not affected by the incorporation of Al into the pore wall and the hysteresis effect between freezing and freezing is very small or negligible.
Abstract: In order to study the freezing/melting behavior of pore water, we performed x-ray diffraction measurements of water confined inside the cylindrical pores of two kinds of siliceous MCM-41 with different pore size and one kind of aluminosilicate MCM-41 as a function of temperature. The results show that its freezing/melting behavior is not affected by the incorporation of Al into the pore wall and the hysteresis effect between freezing and melting is very small or negligible. On cooling the water in the middle of the pores with a pore diameter of 4.2 nm, that is, the free water freezes abruptly around 232 K to give rise to cubic ice while the water confined in the pores with a pore diameter of 2.4 nm freezes very gradually at lower temperatures. The diffraction profile after the freezing of the free water suggests that the interfacial water confined between the surface of the pore wall and the frozen phase of the free water consists of randomly displaced water molecules.
164 citations
TL;DR: In this article, the influence of pore pressure on tensile fracture initiation and propagation direction was analyzed and the experimental results were presented to describe the influence on the fracture initiation in very porous rocks.
164 citations
University of Tokyo1, University of Leicester2, Ocean Drilling Program3, Institute for Geosciences and Natural Resources4, Brown University5, Columbia University6, IFREMER7, University of California, San Diego8, Cornell University9, École Normale Supérieure10, University of Minnesota11, Aberystwyth University12, University of Hawaii13, Bedford Institute of Oceanography14, Stockholm University15, University of Birmingham16, Woodward, Inc.17, University of Missouri18, State University of New York System19
TL;DR: The main objective of Leg 131 was to provide data on the deformational processes and associated hydrogeology of the Nankai prism toe as mentioned in this paper, which was the first time in the history of ocean drilling, in penetrating the complete sedimentary sequence to basaltic basement, reaching 1327 mbsf (metres below seafloor).
164 citations
TL;DR: In this article, the freezing of water adsorbed on high surface area materials such as silica gel, controlled-pore glass, and activated charcoal is investigated with NMR methods.
163 citations
TL;DR: In this paper, a quantitative analysis by examining the basic principles of porous flow and the fundamental properties of sediments and comparing the relative importance of the overloading versus the aquathermal mechanisms is presented.
Abstract: The principal mechanism for abnormally high pore pressure generation has been an important matter of debate for more than a decade. Among the various mechanisms proposed, mechanical overloading and aquathermal pressuring have probably received the greatest attention. Most previous discussions, however, have been based upon qualitative conceptual models. Here we propose a quantitative analysis by first examining the basic principles of porous flow and the fundamental properties of sediments and, second, by comparing the relative importance of the overloading versus the aquathermal mechanisms. The coupling between pore pressure and compaction as well as the nonlinear and path-dependent material properties are found to be critical in the present analysis. We find that although changes in stress and temperature both contribute to pressure generation, mechanical overloading is the main mechanism under normal geological conditions and is capable of producing the observed pore pressure profiles.
163 citations