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SUMMARY:When Two Isn't Better Than One: Twin-Tunnels and Ground-Borne Rail
 way Vibration - Kirsty Kuo (CUED)
DTSTART:20100521T153000Z
DTEND:20100521T160000Z
UID:TALK24236@talks.cam.ac.uk
CONTACT:Anita Clayson
DESCRIPTION:Accurate predictions of ground-borne vibration levels in the v
 icinity of an underground railway are greatly sought after in modern urban
  centers. \n\nYet the complexity involved in simulating the underground en
 vironment means that it is necessary to make simplifying assumptions about
  this system. One such commonly-made assumption is to ignore the effects o
 f neighbouring tunnels\, despite the fact that many underground railway li
 nes consist of twin-bored tunnels\, one for the outbound direction and one
  for the inbound direction.\n\nThis talk will examine this assumption thro
 ugh the development of a novel model for two tunnels embedded in a homogen
 eous\, elastic fullspace. The magnitude of the interactions between the tu
 nnel will be quantified as a function of frequency\, tunnel orientation\, 
 and tunnel thickness. The second tunnel will be shown to have a significan
 t influence on the predicted vibration levels\, leading to the recommendat
 ion that the twin-tunnel model be used for underground railway vibration p
 redictions.\n
LOCATION:Cambridge University Engineering Department\, Oatley Seminar Room
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