Permeability Profiles Recovered from On-the-fly uCPT Sounding


Recent studies have demonstrated the potential to recover permeability profiles directly from uCPT cone metrics recovered on-the-fly. This procedure requires that the pore pressure field around the cone tip is partially drained, and therefore is a proxy for the permeability of the penetrated medium. Essentially, the tip-local behavior can be regarded as a constant strain-rate test, where knowing the strain rate (related to penetration rate), and measuring the excess pore pressure, enables permeability to be evaluated, once corrections for the cone geometry are incorporated.  


Past studies have involved the development of poromechanical methods to describe the behavior of blunt and sharp penetrometers, together with those with a hollow annulus. These characterizations have been used to define permeabilities for blunt penetrometers, and to more fully utilize the full suite of cone metrics in determining both the utility of the characterizations, and their practical range of applicability. This work continues.


Current interests



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Elsworth, D. (1993). “Analysis of piezocone data using dislocation based methods.” J. Geotech. Engr., 119(10), 1601-1623. [pdf]

Elsworth, D. (1992). “Pore pressure response due to penetration through layered media.” Intl. J. Num. Anal. Meth. Geomech., 16(1), 45-64. [pdf]

Elsworth, D. (1991). “Dislocation analysis of penetration in saturated porous media.” J. Engr. Mech, 117(2), 391-408. [pdf]

Elsworth, D. (1990). “Theory of partially drained piezometer insertion.” J. Geotech. Engr., 116(6), 899-914. [pdf]

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