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Pore‐pressure response due to penetration through layered media
Author(s) -
Elsworth Derek
Publication year - 1992
Publication title -
international journal for numerical and analytical methods in geomechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.419
H-Index - 91
eISSN - 1096-9853
pISSN - 0363-9061
DOI - 10.1002/nag.1610160105
Subject(s) - dimensionless quantity , penetration (warfare) , dissipation , mechanics , materials science , pore water pressure , consolidation (business) , penetration depth , slab , layering , geotechnical engineering , porous medium , porosity , geology , composite material , thermodynamics , mathematics , physics , optics , botany , accounting , operations research , geophysics , biology , business
A solution is developed for a point dislocation traversing a slab of saturated porous material under prescribed upper and lower hydraulic boundary conditions as an analogue to penetration in a layer of finite thickness. Pressure response is conditioned by geometrical parameters and those of dimensionless penetration rate U D , dimensionless time following penetration initiation t D , and dimensionless time following penetration arrest t ′ D . The extended set of dimensionless parameters controlling the response makes parameter determination problematic and questionably non‐unique. Pressure response in the proximity of a lower permeable or impermeable boundary is indistinguishable from the homogeneous case for coefficients of consolidation c in excess of 2 cm 2 /s. Below this threshold, penetration‐generated pore pressures are visibly modified in the presence of a discrete boundary. In situ parameters inferred directly from pressure magnitudes, without due consideration for the influence of layering, may therefore be in considerable error. In the hydraulically visible range, the influence of layering on the generated tip pressures is apparent at a separation of the order of 1·5 cm for standard penetration. Although absolute pressure magnitudes are strongly modified in the presence of boundaries, dissipation rates remain relatively unaffected and are consistent with those recorded in the absence of boundaries. The monitoring of dissipation rates, post‐arrest, is suggested as the most reliable and accurate method of extricating parameters, in situ .