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, a method for estimating the stress state within reservoirs at depth with a time-history approach for both elastic and visco-elastic rock behavior is presented, which can incorporate changes in pore pressure, temperature gradients, consolidation and diagenesis through time-varying material properties, and varying tectonic episodes.
Abstract: This study presents a method for estimating the stress state within reservoirs at depth with a time-history approach for both elastic and viscoelastic rock behavior. The model can incorporate changes in pore pressure, temperature gradients, consolidation and diagenesis through time-varying material properties, and varying tectonic episodes. Example calculations are presented for simple cases and for a complete stress history of rocks in the Piceance basin.
76 citations
TL;DR: In this paper, the authors developed a simple extension of the Terzaghi effective stress model to include the independent effects of pore and confining pressures and the sorption strain, which was tested by applying it to a data base of laboratory measurements of coal core permeability with helium, nitrogen, methane, and carbon dioxide over a range of Pore and Confining pressures where it was shown to accurately match the observations with generally consistent model properties.
76 citations
TL;DR: In this article, the authors used an advection/diffusion model to reconstruct the former bottom waters of the Black Sea using a long sediment core retrieved from the NW coast of the basin.
75 citations
TL;DR: In this paper, the authors show that the Terzaghi effective stress law does not describe tensile failure at high internal pressurization rates near 6 MPa/s, and they provide indirect evidence for diminished pore pressure effects reminiscent of dilatant hardening observed in compressive failure experiments.
Abstract: Rupture tests on internally pressurized, thin-walled hollow cylinders of Westerly granite with impermeable inner membranes suggest that the conventional, or Terzaghi, effective stress law does not describe tensile failure at high internal pressurization rates near 6 MPa/s. Unjacketed and saturated samples, with an initial pore pressure and for which the inner cavity pressure was increased rapidly with respect to the diffusivity, display substantially increased apparent tensile strengths and deformational moduli much higher than similarly configured but more slowly pressurized tests. Alternatively, the properties of completely dry test pieces with no pore pressure show little, if any, dependence on pressurization rate. Further, the behavior of the rapid unjacketed tests was similar to that for completely dry samples. These observations cannot be explained by the predicted undrained response, but they provide indirect evidence for diminished pore pressure effects reminiscent of dilatant hardening observed in compressive failure experiments. Calculated pore pressure diffusion rates support this suggestion as pore pressure perturbations cannot be damped out on the time scale of the rapidly pressurized tests. It is not clear if these effects are produced by elastic microcrack dilatancy, of which the nonlinear stress-strain curve of granites is symptomatic, or the irreversible production of new porosity as in compressive shear failure tests.
75 citations
TL;DR: Investigation of decomposition and net mineralization rates of nutrients in relation to sediment and pore water characteristics in peat lakes and ditches found a simple indicator to estimate the potential nutrient mobilization rates from peat sediments to the water layer and a powerful tool for a quick assessment of internal PO(4) fluxes.
75 citations