Ground Settlement Caused by Shield Tunneling in Soil-Rock Composite Strata
Publication: Journal of Performance of Constructed Facilities
Volume 35, Issue 5
Abstract
In this study, ground surface settlement induced by shield tunneling construction is investigated, where special strata composed of upper soil layers and lower rock layers are fully considered. The field data indicates that in soil-rock composite strata, the settlement trough along the transverse surface shows approximately normal distribution. The settlement that occurs during construction accounts for more than 60% of final settlement. The traditional Peck formula was modified to fit this composite strata by regression analysis of the measured data. The suggested values of modification factors and ranged from 0.6 to 1.2 and from 0.3 to 0.9, respectively. Moreover, the results of the numerical simulation show that the settlement pattern along the transverse surface in the soil-rock composite strata is significantly influenced by the hard-layer ratio (hard-layer depth to excavation diameter). Surface settlement decreases, but trough width increases with as the hard-layer ratio increases. In particular, a roughly linear relationship between maximum surface settlement and hard-layer ratio is presented. A method of predicting settlement in shield tunneling construction in soil-rock composite strata is also proposed in this study.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This study is partially supported by the National Natural Science Foundation of China (Grant No. 51978159) and the National Key R&D Program of China (Grant No. 2015BAB07B06).
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Journal of Performance of Constructed Facilities
Volume 35 • Issue 5 • October 2021
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© 2021 American Society of Civil Engineers.
History
Received: Feb 3, 2021
Accepted: Apr 30, 2021
Published online: Jul 23, 2021
Published in print: Oct 1, 2021
Discussion open until: Dec 23, 2021
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