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J4  2012, Vol. 46 Issue (3): 431-440    DOI: 10.3785/j.issn.1008-973X.2012.03.008
Case study of ground surface consolidation settlements induced
by slurry shield tunnelling
ZHANG Zhong-miao1,2, LIN Cun-gang1,2,WU Shi-ming3,ZOU Jian1,2, LIU Jun-wei1,2
1. Institute of Geotechnical Engineering,Zhejiang University,Hangzhou  310027,China;2. Key Laboratory of
Soft Soils and Geoenvironmental Engineering,Ministry of Education,Zhejiang University,Hangzhou  310027,China;
3. Hangzhou Qingchun Road Crossriver Tunnel Co. Ltd., Hangzhou 310002,China
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Extensive analysis of consolidation settlements induced by slurry shield tunnelling in construction of Hangzhou Qiantang River Tunnel was executed to explore their characteristics. A practical method to distinguish the consolidation settlements from immediate settlements was put forward. Formation mechanism, influencing factors, and control measures of consolidation settlements due to slurry shield tunnelling were summarized. This case study shows that: ①Both immediate and settlement longterm ground surface settlement in the transverse direction can be fitted using Peck equation with great precision. ②The transverse ground surface consolidation settlements usually do not conform to Gaussian curves. Maximum consolidation settlements develop at the ground surface above the tunnel centre or in the vicinity, from where they descend gradually with increasing distance. ③Consolidation settlements contribute to widening the settlement trough width. ④The time corresponding to the turning point in settlementtime curve or settlement ratetime curve is proposed to be chosen as boundary to divide the immediate and consolidation settlements.⑤Optimized control of slurry shield excavation parameters contributes to smaller disturbances to surrounding soils, consequently lowering consolidation settlements and their duration.  

Published: 01 March 2012
  TU 473  
Cite this article:

ZHANG Zhong-miao, LIN Cun-gang,WU Shi-ming,ZOU Jian, LIU Jun-wei. Case study of ground surface consolidation settlements induced
by slurry shield tunnelling. J4, 2012, 46(3): 431-440.

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