锁脚锚管受力分析的双参数弹性地基梁模型

doi:10.13722/j.cnki.jrme.2015.1011

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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.

Key words： tunnelling engineering feet-lock pipe steel arch Pasternak model Winkler model

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	CHEN Lijun
	ZHANG Yunliang

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CHEN Lijun,ZHANG Yunliang. Double parameters elastic foundation beam model of feet-lock pipes[J]. , 2016, 35(5): 989-999.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.1011 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/I5/989

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