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SUMMARY:Long-term behaviour of cast-iron cross passages in London Undergro
 und - Zili Li
DTSTART:20131128T164500Z
DTEND:20131128T173000Z
UID:TALK47410@talks.cam.ac.uk
CONTACT:Jen Fusiello
DESCRIPTION:London has one of the most extensive network and oldest sectio
 ns of subway tunnels in the world. Deterioration of the linings and change
  in earth pressures with time is of great concern. In particular\, the eng
 ineering condition of old cross passages between adjacent cast-iron tunnel
 s is found to be critical by recent assessment. To evaluate the behaviour 
 of underground structures\, tunnel engineers usually rely on conservative 
 analytical solutions but may overly underestimate the lining performance.\
 nIn this study\, two series of 3D numerical analyses on tunnel behaviour w
 ere conducted: 1) Structural analyses and 2) Geotechnical analyses. The st
 ructural finite element (FE) analyses considered tunnel structure in a det
 ailed manner\, aiming to produce a more realistic simulation on segmental 
 lining behaviour subjected to load. On the other hand\, the geotechnical s
 tudy performed a soil-fluid coupled 3D numerical model of a cast iron cros
 s passage. It was proposed to answer another question: how much actual soi
 l load is applied on the tunnel linings both in short-term and long-term. 
 \nBoth series of analyses built up from their basic models and then gradua
 lly undertook to investigate more complicated engineering behaviours. The 
 combined work of the structural / geotechnical analyses developed a deeper
  understanding of the long-term behaviour of underground structures.\n
LOCATION:Engineering Department - Lecture Room 6
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