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Volume 38 Issue 2
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JIU Yong-zhi, HUANG Mao-song. Studies on pile bearing characteristics in saturated clay under excavation by model tests and a simplified method[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(2): 202-209. DOI: 10.11779/CJGE201602002
Citation: JIU Yong-zhi, HUANG Mao-song. Studies on pile bearing characteristics in saturated clay under excavation by model tests and a simplified method[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(2): 202-209. DOI: 10.11779/CJGE201602002
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Studies on pile bearing characteristics in saturated clay under excavation by model tests and a simplified method

  • 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministy of Education, Tongji University, Shanghai 200092, China; 3. School of Civil Engineering and Architecture, Zhongyuan University of Technology, Zhengzhou 450007, China

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  • Received Date: January 05, 2015
  • Published Date: February 24, 2016
    Graphical Abstract
    • Abstract
  • Based on a centrifuge pre-consolidation loading device, a model of pile vertical loading system can effectively control over consolidation ratio is developed out. The laboratory model tests of a single pile in saturated clay under excavation are carried out. Based on the results of model test, considering the change of undrained shear strength and K0 coefficient of soil caused by excavation, a simplified nonlinear approach for analysis of a single pile under excavation is proposed. Calculated results are compared with the test results of laboratory model tests of pile. Good agreement is achieved. In addition, responses of a single pile after excavation under vertical load are studied by the simplified method. Computational results show that after excavation, the ultimate bearing capacity of pile and pile head stiffness will reduce. A rational prediction method for estimating the loss of bearing capacity should consider not only the decease of the overburden pressure of the surrounding soil, but also the increase of the K0 coefficient and undrained shear strength.
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    • References (15)
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