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SUMMARY:Tunnelling in sand and its effect on pipelines and piles - Alec Ma
 rshall\, CUED
DTSTART:20081128T163000Z
DTEND:20081128T173000Z
UID:TALK13413@talks.cam.ac.uk
CONTACT:Zelda Stuck
DESCRIPTION:New underground construction is undertaken increasingly close 
 to existing buried structures. The effect that this construction has on th
 ese structures must be properly evaluated. The talk will focus on the prob
 lem of tunnelling in sandy ground and how it influences nearby buried pipe
 lines and piles.\n\n \n\nThe talk will review the results of three series 
 of centrifuge tests: (1) baseline tests of tunnelling in sandy ground\, (2
 ) tunnelling beneath buried pipelines of varying stiffness\, and (3) tunne
 lling beneath driven piles. The tests were performed in axis-symmetric con
 ditions such that movements of the soil and structures located against a t
 ransparent Perspex wall of the centrifuge strong-box could be tracked usin
 g an image-based measurement system known as particle image velocimetry (P
 IV). Interesting results of the change in the shape of the settlement trou
 gh as tunnel volume loss is increased are provided from the baseline tests
  which illustrate the effect of the contractive/dilative nature of the soi
 l. The mechanisms of soil and structure deformation during the tunnel volu
 me loss process of the pipeline and pile tests are highlighted and insight
 s into how each affects the other are drawn by comparing results to the ba
 seline tests. \n\n
LOCATION:Engineering Department - LR6
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