Release Time:2022-07-27  Hits:

Date of Publication: 2016-01-01

Journal: 岩石力学与工程学报

Volume: 35

Issue: 5

Page Number: 989-999

ISSN: 1000-6915

Abstract: To avoid the weakness of the Winkler beam model on elastic foundation,a
   two-parameter foundation model of Pasternak reflecting the continuity of
   the foundation was applied in the analysis of the feet-lock pipe
   combined with steel arch. The formulae to calculate the deflection,shear
   force,bending moment and foundation reaction of feet-lock pipes were
   derived using the theory of structural analysis and beam on elastic
   foundation under the consideration of the compatibility of deformation
   and load transfer between the feet-lock pipe and steel arch. The
   influence of subgrade coefficient and shear stiffness of the foundation
   on the mechanical behaviors of feet-lock pipe was investigated through
   examples and comparison with the Winkler model. It was found that the
   smaller subgrade coefficient resulted in the larger difference of two
   models of feet-lock pipe regarding values shear force,bending moment and
   foundation reaction. The double parameter model produced a lager
   foundation reaction and smaller distribution range,and the foundation
   reaction mainly concentrated in the region near the near-end of the
   feet-lock pipe. The tunnel settlement was less than that calculated from
   the Winkler model. Finally,it was suggested that the designed length of
   the feet-lock pipe should be reduced and its diameter should be
   increased reasonably so as to obtain the desired supporting effect.

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