empirical solution; global sensitivity analysis; mechanized tunneling; settlement trough; surface/tunnel volume loss; Coefficient of lateral earth pressure at rest; Empirical Gaussian distribution; Global sensitivity analysis; Mechanized tunneling; Settlement troughs; Surface settlements; Two-dimensional finite element analysis; Volume loss; Computational Mechanics; Materials Science (all); Geotechnical Engineering and Engineering Geology; Mechanics of Materials; General Materials Science
Abstract :
[en] This study investigates the ground movements due to mechanized tunnel excavation by applying two-dimensional finite element analyses. To assess the contribution of the compressibility and plasticity of the soil on the ground movements, different constitutive models are employed to describe the soil behavior. The influence of volume loss around the tunnel on the surface volume loss is investigated, and a quadratic correlation between them is proposed. Consequently, the empirical Gaussian distribution curve, which is generally used to determine the tunneling induced settlement trough, is improved by applying the proposed quadratic correlation between surface volume loss and tunnel volume loss. Furthermore, the settlement trough width parameter has been derived by a linear function of tunnel volume loss as well. The proposed equations are validated via a case study of centrifuge tests from the literature. The results show that the proposed modification enhances the empirical solution by having better knowledge on the model parameters. Additionally, tunnel overburden and coefficient of lateral earth pressure at rest (K 0 ) are taken into account to study their influence on the tunneling induced surface settlements. Finally, global sensitivity analysis is applied to evaluate the relative importance of corresponding model parameters in terms of their influence on the ground movements.
Disciplines :
Civil engineering
Author, co-author :
Zhao, Chenyang; Department of Civil and Environmental Engineering, Universitätsstr.150, Ruhr-Universität Bochum, Bochum, Germany
ALIMARDANI LAVASAN, Arash ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Engineering (DoE)
Barciaga, Thomas; Dr. Spang Ingenieurgesellschaft für Bauwesen, Geologie und Umwelttechnik mbH, Witten, Germany
Schanz, Tom; Department of Civil and Environmental Engineering, Universitätsstr.150, Ruhr-Universität Bochum, Bochum, Germany
External co-authors :
yes
Language :
English
Title :
Mechanized tunneling induced ground movement and its dependency on the tunnel volume loss and soil properties
Publication date :
March 2019
Journal title :
International Journal for Numerical and Analytical Methods in Geomechanics
ISSN :
0363-9061
eISSN :
1096-9853
Publisher :
John Wiley and Sons Ltd, Chichester, West Sussex, Gbr
China Scholarship Council Deutsche Forschungsgemeinschaft
Funding text :
This research has been supported by the German Research Foundation (DFG) through the Collaborative Research Center (SFB 837), and the first author is sponsored through a scholarship by China Scholarship Council (CSC). These supports are gratefully acknowledged. Furthermore, the authors would like to thank the anonymous reviewers for their constructive comments and suggestions.
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