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SUMMARY:Experiments in Tunnel-Soil-Structure Interaction - Stefan Ritter (
 University of Cambridge)
DTSTART:20171123T160000Z
DTEND:20171123T164500Z
UID:TALK87781@talks.cam.ac.uk
CONTACT:Magdalena Charytoniuk
DESCRIPTION:Urban populations are likely to continue to grow which places 
 additional pressure on existing transport networks. A potential solution t
 o meet the increased demand is to go underground. Such subsurface infrastr
 ucture solutions have the potential to reduce congestion\, pollution and n
 oise and thus make our cities more liveable. However\, new underground con
 struction involves ground movements\, which pose a significant risk to the
  built environment. Present risk management is primarily based on costly m
 onitoring and damage prevention measures. Understanding and accurately pre
 dicting the interaction between excavation induced ground movements and ex
 isting buildings is crucial to reduce these cost.\n\nThe primary motivatio
 n of this work is to deepen the fundamental understanding of ground and bu
 ilding response to tunnel excavation in soft ground. This presentation beg
 ins by introducing geotechnical centrifuge testing to study tunnelling eff
 ects on surface structures. It will then move on to describe the performed
  experimental program including the techniques applied to conceptually mod
 el tunnelling-induced volume loss and to replicate realistic surface struc
 tures using 3D printed small-scale models. More precisely\, the novel appl
 ication of 3D printing to replicate detailed surface structures of brittle
  material properties\, similar to masonry\, and related experimental chall
 enges are addressed. Subsequently\, results that highlight the ground and 
 building response to tunnelling subsidence will be presented. Specifically
 \, the presentation will address: 1) the effect of the building-to-tunnel 
 position on the shape and magnitude of vertical surface ground displacemen
 ts\, 2) the impact of surface structures on the tunnelling-induced volume 
 loss\, 3) the transfer of vertical and horizontal ground movements to the 
 buildings and 4) the effect of building characteristics such as the façad
 e opening area\, the building length and the building layout on the soil-s
 tructure interaction. Finally\, the experimental results are used to evalu
 ate available methods for predicting the effects of tunnelling-induced gro
 und movements on structures\, after which recommendations for refinement o
 f these methods are proposed.
LOCATION: Cambridge University Engineering Department\, Lecture Room 5
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