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Geomechanics and Engineering
  Volume 11, Number 4, October 2016 , pages 587-605

Determination of tunnel support pressure under the pile tip using upper and lower bounds with a superimposed approach
Yong-Joo Lee

    This study aimed to develop upper and lower bounds to predict the tunnel support pressure under the pile tip during the circular tunnel excavation. Most previous studies on the upper and lower bound methods were carried out for the single ground structures, e.g., retaining wall, foundation, ground anchor and tunnel, in the homogeneous ground conditions, since the pile-soil-tunnel interaction problem is very complicated and sophisticated to solve using those bound methods. Therefore, in the lower bound approach two appropriate stress fields were proposed for single pile and tunnel respectively, and then they were superimposed. In addition, based on the superimposition several failure mechanisms were proposed for the upper bound solution. Finally, these upper bound mechanisms were examined by shear strain data from the laboratory model test and numerical analysis using finite element method.
Key Words
    pile-soil-tunnel interaction; upper and lower bounds; tunnel support pressure; stress field; superimposition; upper bound mechanism; shear strain
Department of Civil Engineering, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 139-743, Republic of Korea.

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