A study on problems associated with finite element excavation analysis by the stress-flow coupled method
✍ Scribed by Ohtsu, Hiroyasu; Ohnishi, Yuzo; Taki, Haruo; Kamemura, Katsumi
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 625 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0363-9061
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✦ Synopsis
This study attempts to address some problems associated with excavation analysis by means of the stress-#ow coupled method. This is done through the investigation of two examples, both of which are excavation analyses modelling a sequential excavation process. The "rst 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 e!ect 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.