Upper Bound Analysis for Collapse Failure of Shield Tunnel Face Excavated in Unsaturated Soils Considering Steady Vertical Flow
Joint Authors
Wang, Weijun
Zhang, Jia-hua
Zhang, Biao
Zhang, Dao-bing
Source
Mathematical Problems in Engineering
Issue
Vol. 2019, Issue 2019 (31 Dec. 2019), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2019-01-27
Country of Publication
Egypt
No. of Pages
10
Main Subjects
Abstract EN
Natural soils are mostly in an unsaturated state and the corresponding mechanical properties differ significantly from a saturated one.
In traditional stability analysis for a shield tunnel face, the soil mass is typically assumed to be dry or saturated for convenience of analysis.
In this work, based on the upper bound theorem of classical plasticity theory and the log-spiral failure mechanism, face stability of the shield tunnel excavated in unsaturated soils under vertical steady flow is studied.
The profile of shear strength is determined by virtues of the unified effective stress approach and the analytical solution of matric suction under unsaturated steady flow.
On this basis, the analytical expression for the supporting pressure is deduced and the sequential quadratic programming is employed to search for the optimal upper bound solution.
Through parametric analysis it is found the fitting parameters of SWCC and the groundwater level affect the supporting pressure notably.
Besides, the relevant influence of vertical discharge is also significant when clayey soils are concerned.
American Psychological Association (APA)
Zhang, Jia-hua& Wang, Weijun& Zhang, Biao& Zhang, Dao-bing. 2019. Upper Bound Analysis for Collapse Failure of Shield Tunnel Face Excavated in Unsaturated Soils Considering Steady Vertical Flow. Mathematical Problems in Engineering،Vol. 2019, no. 2019, pp.1-10.
https://search.emarefa.net/detail/BIM-1194667
Modern Language Association (MLA)
Zhang, Jia-hua…[et al.]. Upper Bound Analysis for Collapse Failure of Shield Tunnel Face Excavated in Unsaturated Soils Considering Steady Vertical Flow. Mathematical Problems in Engineering No. 2019 (2019), pp.1-10.
https://search.emarefa.net/detail/BIM-1194667
American Medical Association (AMA)
Zhang, Jia-hua& Wang, Weijun& Zhang, Biao& Zhang, Dao-bing. Upper Bound Analysis for Collapse Failure of Shield Tunnel Face Excavated in Unsaturated Soils Considering Steady Vertical Flow. Mathematical Problems in Engineering. 2019. Vol. 2019, no. 2019, pp.1-10.
https://search.emarefa.net/detail/BIM-1194667
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1194667