Journal
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
Volume 21, Issue 2, Pages 119-132Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tust.2005.06.003
Keywords
arching effect; tunnel stability; centrifuge modeling; numerical modeling
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A series of centrifuge model tests and numerical simulations of these tests were carried out to investigate the surface settlement troughs, excess pore water pressure generation, tunnel stability and arching, effects that develop during tunneling in soft clayey soil. The two methods were found to provide consistent results of the surface settlement troughs, excess pore water generation, and the overload factors at collapse for both single and parallel tunneling. The arching ratio describes the evolution of the arching effects on the soil mass surrounding tunnels and can be derived from the numerical analysis. The boundaries of the arching zones for both single tunneling and parallel tunneling were determined. In addition, the boundaries of the positive and negative arching zones were also proposed. (c) 2005 Elsevier Ltd. All rights reserved.
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