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A study on problems associated with finite element excavation analysis by the stress‐flow coupled method
Author(s) -
Ohtsu Hiroyasu,
Ohnishi Yuzo,
Taki Haruo,
Kamemura Katsumi
Publication year - 1999
Publication title -
international journal for numerical and analytical methods in geomechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.419
H-Index - 91
eISSN - 1096-9853
pISSN - 0363-9061
DOI - 10.1002/(sici)1096-9853(199911)23:13<1473::aid-nag34>3.0.co;2-5
Subject(s) - excavation , geotechnical engineering , finite element method , stress (linguistics) , rock mass classification , engineering , flow (mathematics) , qualitative analysis , structural engineering , pore water pressure , mathematics , geometry , qualitative research , social science , philosophy , linguistics , sociology
This study attempts to address some problems associated with excavation analysis by means of the stress‐flow coupled method. This is done through the investigation of two examples, both of which are excavation analyses modelling a sequential excavation process. The first example is a three‐dimensional elastic analysis of a tunnel constructed in soft rock layer. The second example is an axi‐symmetric elasto‐plastic analysis of a shaft constructed in slightly overconsolidated clay layer. In order to clarify the effect of sequential excavation process on the analysis results, a conventional two‐dimensional analysis on each example is also carried out. Through this study, we will demonstrate that it is essential to consider in detail the incremental advance of a tunnel face when one investigates the change of pore water pressure and stresses surrounding a tunnel face during excavation. Additionally, on the basis of the analytical results obtained, a proposal is presented for evaluating the stability of rock mass surrounding a tunnel during construction. Copyright © 1999 John Wiley & Sons, Ltd.