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Effect of Longitudinal Gradient on 3D Face Stability of Circular Tunnel in Undrained Clay
- Source :
- Advances in Civil Engineering, Vol 2020 (2020)
- Publication Year :
- 2020
- Publisher :
- Wiley, 2020.
-
Abstract
- The longitudinal gradient existed in shield-driven tunnel crossing river or channel has a longitudinal gradient, which is often ignored in most stability analyses of the tunnel face. Considering the influence of the longitudinal gradient into A(a) continuous velocity field, the present paper, conducting a limit analysis of the tunnel face in undrained clay, adopted to yield the upper-bound solutions of the limit pressure supporting on a three-dimensional tunnel face. The least upper bounds of the collapse and blow-out pressures can be obtained by conducting an optimization procedure. These upper-bound solutions are given in the design charts, which provide a simple way to assess the range of the limit pressure in practice. The influence of the longitudinal gradient becomes more significant with the increase of γD/su and C/D. The blow-out pressure for tunneling in a downward movement could be overestimated and the collapse pressure for tunneling in an upward movement could be conversely underestimated, with ignoring the influence of the longitudinal gradient.
- Subjects :
- Engineering (General). Civil engineering (General)
TA1-2040
Subjects
Details
- Language :
- English
- ISSN :
- 16878086 and 16878094
- Volume :
- 2020
- Database :
- Directory of Open Access Journals
- Journal :
- Advances in Civil Engineering
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.967c1270d2d344299395d3cee62b0d41
- Document Type :
- article
- Full Text :
- https://doi.org/10.1155/2020/5846151