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Modeling Ground-Shell Contact Forces in NATM Tunneling, Based on 3D Displacement Measurements
Based on an advanced micromechanics-based nonlinear creep model for shotcrete and thin shell kinematics, measured displacement data are first converted into in-plane stress fields throughout a shotcrete tunnel shell driven according to the New Austrian Tunneling Method (NATM). Subsequently, the partial differential equations for local force equilibrium in the cylindrical coordinate directions are solved for the out-of-plane shell stresses, inclusive of the tractions at the ground-shell interface. Results obtained for a NATM-tunnel driven through clayey ground at moderate depth, show that the maximum shear tractions at the ground-shell interface may even exceed the maximum normal tractions ("ground pressure"). At the same time, even a young top heading tunnel shell may act as an arching thrust. We regard our method as a further step in the continuous refinement of interpretation displacement measurements stemming from tunnel monitoring systems for the NATM, on a well-defined mechanical basis. This results in two structural models for top heading excavation stages, which might have the potential to support NATM predesign activities in the future.
Modeling Ground-Shell Contact Forces in NATM Tunneling, Based on 3D Displacement Measurements
Based on an advanced micromechanics-based nonlinear creep model for shotcrete and thin shell kinematics, measured displacement data are first converted into in-plane stress fields throughout a shotcrete tunnel shell driven according to the New Austrian Tunneling Method (NATM). Subsequently, the partial differential equations for local force equilibrium in the cylindrical coordinate directions are solved for the out-of-plane shell stresses, inclusive of the tractions at the ground-shell interface. Results obtained for a NATM-tunnel driven through clayey ground at moderate depth, show that the maximum shear tractions at the ground-shell interface may even exceed the maximum normal tractions ("ground pressure"). At the same time, even a young top heading tunnel shell may act as an arching thrust. We regard our method as a further step in the continuous refinement of interpretation displacement measurements stemming from tunnel monitoring systems for the NATM, on a well-defined mechanical basis. This results in two structural models for top heading excavation stages, which might have the potential to support NATM predesign activities in the future.
Modeling Ground-Shell Contact Forces in NATM Tunneling, Based on 3D Displacement Measurements
Springer Ser.Geomech.,Geoengineer.
Yang, Qiang (editor) / Zhang, Jian-Min (editor) / Zheng, Hong (editor) / Yao, Yangping (editor) / Ullah, Shafi (author) / Pichler, Bernhard (author) / Hellmich, Christian (author)
2013-01-01
4 pages
Article/Chapter (Book)
Electronic Resource
English
| British Library Online Contents | 2013
| Wiley | 2014
Prediction of ground movements due to NATM tunneling
| British Library Conference Proceedings | 2001