Development and validation of a 3D numerical model for TBM–EPB mechanised excavations |
| |
| Institution: | 1. Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan, Italy;2. University of La Coruña, Campus de Elviña, 15071 La Coruña, Spain;1. ELE Beratende Ingenieure GmbH – Erdbaulaboratorium Essen, Susannastraße 31, 45136 Essen, Germany;2. Institute for Tunnelling and Construction Management, Ruhr-University Bochum, Universitätsstraße 150, 44801 Bochum, Germany;1. Ecole Polytechnique Fédérale de Lausanne (EPFL), School of Architecture, Civil and Environmental Engineering, Laboratory of Rock Mechanics (LMR), Lausanne, Switzerland;2. Department of Civil Engineering, Monash University, Melbourne, Victoria 3800, Australia;1. CNNC Beijing Research Institute of Uranium Geology, Beijing 100029, China;2. Ecole Polytechnique Federalede Lausanne (EPFL), Lausanne CH-1015, Switzerland;3. Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China;1. Istanbul Medeniyet University, Civil Eng. Dept., Goztepe, Istanbul, Turkey;2. Istanbul Technical University, Mining Eng. Dept., 34469 Maslak, Istanbul, Turkey;1. Faculty of Civil Engineering, University of Tabriz, Iran;2. Faculty of Engineering, Azarbaijan Shahid Madani University, Iran;3. Department of Mining Engineering, Sahand University of Technology, Tabriz, Iran |
| |
| Abstract: | A 3D numerical model for mechanised excavations is presented, which is capable of simulating the overall process of excavation and construction of a tunnel when a TBM EPB (Tunnel Boring Machine–Earth Pressure Balance) is used.The main construction aspects of a mechanised excavation are modelled. Their influence on calculated ground displacements are investigated by means of a series of parametric analyses.With the aim of testing the performance of the proposed 3D numerical model, a series of 25 Class C predictions has been carried out. Case Histories related to the construction of the 1995–2003 Madrid Metro Extension Project were considered for this purpose.As a general rule, the results obtained with the Modified Cam–Clay model closely fit in situ measurements. When the Linear-Elastic or the Mohr–Coulomb models are used, it is not as easy to summarise the results obtained, as higher fluctuations are observed around in situ measured data. A good agreement is also shown when the distribution of horizontal displacements along depth is considered.For some sections, the mechanised excavation model is not capable of reproducing the high values of the surface settlements measured in situ. A closer look at the results shows that mixed face conditions are found for these cases, with the TBM excavating through layered soil formations having sharply different mechanical behaviour. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
