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The Effect of Backfilling Stiffness on the Lateral Response of Deeply Buried pipelines:an Experimental Study

Journal of Marine Science and Application 2021年第1期20卷 21-33页

作者： Morteza Kianian M.Esmaeilzadeh Hodjat Shiri Civil Engineering Department Faculty of Engineering and Applied ScienceMemorial University of NewfoundlandSt.John’sNL A1B 3X5Canada

Subsea pipelines passing through the shallow area are physically protected against the environmental,accidental,and operational loads by trenching and *** on construction methodology,environmental loads,and seabed soil properties,the stiffness of backfilling material may become largely different from the native ground(softer than native ground in most of the cases).The different stiffness between the backfill and native ground affects the soil failure mechanisms and lateral soil resistance against large pipeline displacements that may happen due to ground movement,landslides,ice gouging,and drag embedment *** important aspect is not considered by current design *** this paper,the effect of trench-backfill stiffness difference on lateral pipeline-backfill-trench interaction was investigated by performing centrifuge *** soil deformations and failure mechanisms were obtained by particle image velocimetry(PIV)*** experiments were conducted by using three different backfills including loose sand,slurry,and chunky clay that represent the purchased,natural in-fill,and preexcavated materials,*** study shows that the current design codes underestimate the lateral soil resistance for small to moderate pipe displacements inside the trench and overestimate it for large lateral displacement,where the pipeline is penetrating into the trench wall.

关键词： Lateral pipe-soil interaction pipeline-trench bed interaction p-y response Large deformation Centrifuge testing

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