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 paper, the authors developed a physicochemical theory for describing shale deformation, which considers chemical and poroelastic processes and couples ion transfer in the mud/shale system to formation stresses and pore pressure.
97 citations
TL;DR: In this paper, the authors model landslide initiation as slip surface growth driven by locally elevated pore pressure, with particular reference to submarine slides, assuming an elastic medium and friction that weakens with slip, solutions exist in which the slip surface may dynamically grow at a rate of the order of the sediment shear wave speed, similar to earthquake nucleation.
Abstract: [1] We model landslide initiation as slip surface growth driven by locally elevated pore pressure, with particular reference to submarine slides. Assuming an elastic medium and friction that weakens with slip, solutions exist in which the slip surface may dynamically grow, without further pore pressure increases, at a rate of the order of the sediment shear wave speed, a situation comparable to earthquake nucleation. The size of the rupture at this transition point depends weakly on the imposed pore pressure profile; however, the amount of slip at the transition depends strongly on whether the pore pressure was broadly or sharply elevated. Sharper profiles may result in pore pressures reaching the total slope-normal stress before dynamic rupture is nucleated. While we do not account for modes of failure other than pure slip on a failure surface, this may be an indication that additional modes involving liquefaction or hydraulic cracking may be factors in the initiation of shallow slope failure. We identify two length scales, one geometrical (h, depth below the free surface) and one material (l, determined by the frictional weakening rate) and a transition in nucleation behavior between effectively “deep” and “shallow” limits dependent on their ratio. Whether dynamic propagation of failure is indefinite or arresting depends largely on whether the background shear stress is closer to nominal peak or residual frictional strength. This is determined in part by background pore pressures, and to consider the submarine case we simplify a common sedimentation/consolidation approach to reflect interest in near-seafloor conditions.
97 citations
TL;DR: In this paper, the thermal properties and structure or water in porous Vycor glass and various silica gels with pore radii in the range 23-70 A were investigated using calorimetry and X-ray diffraction.
Abstract: The thermal properties and structure or water in porous Vycor glass and various silica gels with pore radii in the range 23-70 A were investigated using calorimetry and X-ray diffraction. Samples containing pore water only and those containing pore water in equilibrium with bulk water were studied. The amounts or bound and freezable water in the samples were determined by measuring the heat or melting as a function or pore water content and by application or thermoporometry. The melting point or ice was depressed by 9-20 K, depending on the pore size
96 citations
TL;DR: In this paper, the authors measured the changes in nano-scale mechanical properties induced by acid exposure and found that the carbonate rock matrix partially dissolved, and absolute and effective porosity and permeability significantly increased.
96 citations
TL;DR: This paper measured U in sediments (both pore waters and solid phase) from three locations on the middle Atlantic Bight (MAB) from the eastern margin of the United States: a northern location on the continental shelf off Massachusetts (OC426, 75m water depth), and two southern locations off North Carolina (EN433-1, 647 meters water depth and EN433-2, 2648 meters water depths).
96 citations