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SUMMARY:Soil-Pipeline Interaction in Unsaturated Soils - Dilan Robert\, CU
 ED
DTSTART:20100507T153000Z
DTEND:20100507T163000Z
UID:TALK23665@talks.cam.ac.uk
CONTACT:Zelda Stuck
DESCRIPTION:Pipelines used for the transport of energy and services are ve
 ry important lifelines to modern society. The vital role that they play in
  our present economy is reflected in the many kilometres of pipelines laid
  in onshore and offshore locations worldwide. They are often buried in the
  ground which provides protection and support\, but ground \nmovements can
  induce unwanted loading on the pipelines.\n\nAlthough the pipelines gener
 ally buried in unsaturated soils\, pipeline design guidelines are based on
  the assumption that the soil is either dry or fully saturated. For many y
 ears\, the mechanical behaviour of unsaturated soils was either ignored or
  approached inappropriately by \nusing the traditional framework of satura
 ted soil mechanics. For certain geotechnical problems\, it may not be acce
 ptable to have such assumptions because the meniscus formed between soil p
 articles creates an additional normal force between the particles by sucti
 on\, which in \nturn forms temporary bonds. A recent series of large-scale
  physical model experiments in the Pipeline Engineering Research Laborator
 y of Tokyo Gas\, Japan\, show a higher peak load under unsaturated conditi
 ons compared to dry conditions. In contrast\, other recent experiments \np
 erformed at Cornell University show that the soil-loads by lateral pipelin
 e movement in dry and unsaturated sands are virtually the same. Thus\, the
  effect of partial saturation on soil loading to pipeline may be different
  depending on soil type\, moisture condition and density.\nThe current stu
 dy investigates this problem through constitutive modelling of the unsatur
 ated soils used for testing and finite element analysis of soil-pipeline i
 nteractions in unsaturated soils.
LOCATION:Engineering Department - LR6
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