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http://dx.doi.org/10.7843/kgs.2007.23.9.17

Prediction of Deformation Behavior of a Shallow NATM Tunnel by Strain Softening Analysis  

Lee, Jae-Ho (Dept. of Civil Engrg., Kyungpook National Univ.)
Shinich, Akutagawa (Dept. of Architecture and Civil Engrg., Kobe Univ.)
Kim, Young-Su (Dept. of Civil Engrg., Kyungpook National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.23, no.9, 2007 , pp. 17-28 More about this Journal
Abstract
Urban tunnels are usually important in terms of prediction and control of surface settlement, gradient and ground displacement. This paper has studied the application of strain softening analysis to predict deformation behavior of an urban NATM tunnel. The applied strain softening model considered the reduction of shear stiffness and strength parameter after yielding with strain softening effects of a given material. Measurements of surface subsidence and ground displacement were adopted to monitor the ground behavior resulting from the tunneling and to modify tunnel design. The numerical analysis results produced a strain distribution, deformational mechanism and surface settlement profile, which are in good agreement with the results of case study. The approach of strain softening modeling is expected to be a good prediction method on the ground displacement associated with NATM tunneling at shallow depth and soft ground.
Keywords
Deformation behavior; NATM tunnel; Prediction method; Strain softening analysis;
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