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 authors measured the San Andreas fault gouge under confining pressures up to 2 kbar and found that permeability was sensitive to confining pressure and differential stress, but did not depend significantly on accumulated strain.
Abstract: The permeability and strength of San Andreas fault gouge from the Cienega Valley was measured under confining pressures up to 2 kbar. The gouge was composed almost entirely of clay minerals, predominantly montmorillonite and mixed-layer clays. Permeabilities ranged between 1 and 10 nanodarcies for confining pressures of a few hundred bars to 1 kbar, and less than 1 nanodarcy for pressures greater than 1 kbar. Permeability was sensitive to confining pressure and differential stress, but did not depend significantly on accumulated strain.
The low strength of saturated clay is often attributed to the buildup of excess pore pressure as the clay is stressed. These experiments, performed under drained conditions where excess pore pressure was not created, suggest that loosely bonded interlayer water in the hydrated clays can generate a pseudo-pore pressure that serves to lower the strength of the gouge.
74 citations
TL;DR: A combined DC resistivity and induced polarization (IP) survey was carried out along one of the major flowpaths in the tailings and the data were inverted to produce detailed electrical conductivity and chargeability structures of the cross-section below the survey line as mentioned in this paper.
74 citations
TL;DR: In this paper, the authors compared the near surface (0-20 cm below sea floor [cmbsf]) aqueous ( NO 3 -and solid phase reactive Fe distributions, between two volcanogenic sediment settings: [1] a deep sea tephra-rich deposit neighbouring the volcanically active island of Montserrat and [2] mixed biosiliceous-volcanogenic sediments from abyssal depths near the volcanoically inactive Crozet Islands archipelago.
74 citations
TL;DR: In this paper, a simple analytical solution to the one-dimensional consolidation theory for unsaturated soils is presented, where the coefficients of permeability and volume change are assumed to remain constant throughout the consolidation process and two new variables are introduced to transform the two coupled governing equations of porewater and pore-air pressures into an equivalent set of partial differential equations.
Abstract: SUMMARY
This paper presents a simple analytical solution to Fredlund and Hasan's one-dimensional (1-D) consolidation theory for unsaturated soils The coefficients of permeability and volume change for unsaturated soils are assumed to remain constant throughout the consolidation process The mathematical expression of the present solution is much simpler compared with the previous available solutions in the literature Two new variables are introduced to transform the two coupled governing equations of pore-water and pore-air pressures into an equivalent set of partial differential equations, which are easily solved with standard mathematical formulas It is shown that the present analytical solution can be degenerated into that of Terzaghi consolidation for fully saturated condition The analytical solutions to 1-D consolidation of an unsaturated soil subjected to instantaneous loading, ramp loading, and exponential loading, for different drainage conditions and initial pore pressure conditions, are summarized in tables for ease of use by practical engineers In the case studies, the analytical results show good agreement with the available analytical solution in the literature The consolidation behaviors of unsaturated soils are investigated The average degree of consolidation at different loading patterns and drainage conditions is presented The pore-water pressure isochrones for two different drainage conditions and three initial pore pressure distributions are presented and discussed Copyright © 2013 John Wiley & Sons, Ltd
74 citations
TL;DR: In this article, an experimental study of wave-induced pore pressures in marine sediments is presented, where additional static water pressures were added onto the harmonic dynamic wave pressure, which allowed us to simulate a case with a greater depth of water.
73 citations