This paper interprets ground movements induced by tunnel construction, by comparing monitoring data with analytical and numerical predictions based on an assumed set of deformation parameters at the cavity boundary. By minimizing differences between the computed and measured ground movements, optimal cavity deformation parameters can then be used to characterize the performance of the tunneling process. We compare the performance of three tunnel construction methods in stiff clay: (i) closed-face excavation using an Earth Pressure Balance (EPB) tunnel boring machine; (ii) open-face shield excavation; and (iii) sequential construction using the New Austrian Tunneling Method (NATM). The measured data were obtained from three projects in London each involving different tunnel size and depth, but all excavated through deep units of stiff London clay. The measured performance in each case is evaluated using analytical solutions, that assume linear elastic properties for an elastic half-space, and numerical simulations that use an effective stress soil model, MIT-S1, with input parameters calibrated to elemental behavior of the London Clay. Although the numerical analyses achieve better agreement with the measured data, the analytical solutions perform well and could be used in future studies. The results indicate that the closed-face tunneling provided the best control of volume loss, while open-face shield excavation caused the largest ovalization of the tunnel cavity. The proposed methodology offers a practical framework for cataloging and comparing tunnel performance in future projects.
Tunnelling and Underground Space Technology – Elsevier
Published: Apr 1, 2018
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera