Back analysis; Mechanized tunneling; Meta-modeling; Numerical simulation; Optimization; Sensitivity analysis; Global sensitivity analysis; Identification techniques; Meta model; Model validation and calibrations; Modified Cam-clay model; Small-strain stiffness; Geotechnical Engineering and Engineering Geology; Computer Science Applications
Abstract :
[en] In this research, Finite Element (FE) method is applied to simulate the shield supported mechanized excavation of Western Scheldt tunnel in the Netherlands. Both 2D and 3D numerical models are created to predict the system behavior. Sensitivity analysis and parameter identification techniques are utilized to calibrate and validate the model based on field measurement. The mechanical behavior of the soil is modeled by an advanced elasto-plastic model, namely Hardening Soil model correlating small strain stiffness (HSS). Global sensitivity analysis is carried out in this paper to evaluate the relative sensitivity of model response to each input parameter. Thereafter, a parameter identification technique (back analysis) is employed to find the optimized values of the selected parameters. To accomplish this, the computationally expensive FE-model is replaced by a meta-model in order to reduce the calculation time and effort. Moreover, a soft soil constitutive model based on the modified Cam-clay model deals with primary compression of fine grained soils, is assigned to the clay layer to further improve the numerical prediction of system behavior. Due to the importance of model subsystems, such as face pressure and volume loss, the sensitivity of model response to subsystems has been evaluated. The results show that optimized parameters obtained via back analysis make the numerical simulation capable to well predict the ground settlement.
Disciplines :
Civil engineering
Author, co-author :
Zhao, Chenyang; Ruhr-Universität Bochum, Chair of Foundation Engineering, Soil and Rock Mechanics, Bochum, Germany
ALIMARDANI LAVASAN, Arash ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Engineering (DoE)
Barciaga, Thomas; Ruhr-Universität Bochum, Chair of Foundation Engineering, Soil and Rock Mechanics, Bochum, Germany
Zarev, Veselin; Ruhr-Universität Bochum, Chair of Foundation Engineering, Soil and Rock Mechanics, Bochum, Germany
Datcheva, Maria; Institute of Mechanics, Bulgarian Academy of Sciences, Sofia, Bulgaria
Schanz, Tom; Ruhr-Universität Bochum, Chair of Foundation Engineering, Soil and Rock Mechanics, Bochum, Germany
External co-authors :
yes
Language :
English
Title :
Model validation and calibration via back analysis for mechanized tunnel simulations - The Western Scheldt tunnel case
German Research Foundation China Scholarship Council
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. The authors appreciate the discussion with Mr. Kavan Khaledi on meta-modeling. Moreover, the authors acknowledge the support of Professor Markus Thewes’s research group (TLB at Ruhr-Universität Bochum).
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