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Title: Deep cavity flow mechanism of pipe penetration in clay
Authors: Tho, K.K. 
Leung, C.F. 
Chow, Y.K. 
Palmer, A.C. 
Keywords: Clay
Deep cavity flow mechanism
Issue Date: Jan-2012
Citation: Tho, K.K., Leung, C.F., Chow, Y.K., Palmer, A.C. (2012-01). Deep cavity flow mechanism of pipe penetration in clay. Canadian Geotechnical Journal 49 (1) : 59-69. ScholarBank@NUS Repository.
Abstract: The evolution of penetration resistance as a function of penetration depth of a pipe into a cohesive seabed is of practical importance, particularly in the areas of pipeline on-bottom stability assessment and T-bar penetrometer data interpretation. In the past, this subject was addressed primarily in a discontinuous manner by separating the penetration response into two broad regimes of shallow and deep penetrations followed by deriving plasticity solutions assuming a simplified "wished-in-place" configuration. In this manner, the effects of evolving seabed topology and the progressive transition from a shallow failure mechanism to a deep failure mechanism are neglected. This paper aims to provide greater insights into the transition zone, which is especially important for the interpretation of T-bar test data at shallow depths. In this study, the penetration response of a smooth pipe over a wide range of normalized clay strengths is numerically simulated. A deep cavity flow mechanism where the bearing capacity factor is 12% less than the conventional full-flow mechanism is identified and found to be operative up to a depth of 10 pipe diameters under a certain combination of material properties. An analysis method is proposed to predict the load-penetration response for a given set of clay strengths and pipe diameters.
Source Title: Canadian Geotechnical Journal
ISSN: 00083674
DOI: 10.1139/T11-088
Appears in Collections:Staff Publications

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