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Volume 46 Issue 6
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LIAO Lijian, SU Wei, YANG Xinan, WANG Yuquan. A bidirectional m-method for allocating spatial effects of special pile groups[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(6): 1197-1205. DOI: 10.11779/CJGE20230212
Citation: LIAO Lijian, SU Wei, YANG Xinan, WANG Yuquan. A bidirectional m-method for allocating spatial effects of special pile groups[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(6): 1197-1205. DOI: 10.11779/CJGE20230212
shu

A bidirectional m-method for allocating spatial effects of special pile groups

  • 1.

    China Railway Design Corporation, Tianjin 300308, China

  • 2.

    College of Transportation Engineering, Tongji University, Shanghai 201804, China

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  • Received Date: March 12, 2023
  • Available Online: June 04, 2024
    Graphical Abstract
    • Abstract
  • The load distribution from a pile group to a single pile is the key issue in calculation of pile foundations. Aiming at the limitation that the one-way m-method in the Chinese specifications and codes is only applicable to plane action, the formulas are derived from three levels: stiffness of a single pile, stiffness of pile groups and equation for force balance, and the stiffness matrix for a deformation-coordinated pile group and the equation for spatial force balance are established, forming a bidirectional m-method suitable for spatial loads. Based on the examples of symmetric straight piles with equal length, bidirectional inclined piles and asymmetric piles, the calculated results by the one-way m-method and the bidirectional m-method are compared and analyzed. The results show that when using the one-way m-method to calculate the symmetric straight piles with equal length, the results are accurate. When calculating the bidirectional inclined piles, the bending moment and shear force of a single pile fluctuate greatly, with the maximum value being about 20% smaller. When calculating the asymmetric piles, the sum of external forces of a single pile is not closed to the total external force, and the reliability is low. The theoretical solutions for the bidirectional m-method can cover these pile foundation types, and the results are closer to the finite element numerical solutions. The research results provide a fast and simple method for special pile foundations, expanding the scope of application of the Chinese design specifications and codes for pile foundations of highway and railway bridges.
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    • References (20)
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