寒区格构梁与锚杆复合结构的冻胀效应计算方法

doi:10.13722/j.cnki.jrme.2019.0637

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Abstract In order to study the variations of the deformation and internal force under frost heave effect of lattice beam and anchor composite structure in cold regions，a calculation model of the composite structure considering frost heave is established basing on Winkler elastic foundation beam theory. Considering coordinated deformation of the soil and the support structure and regarding the frost heave displacement of soil as the superposition of free frost heave and constrained frost heave，a calculation expression of frost heave force is given，and calculation formulas of deformation and internal force of lattice beam under frost heave effect are derived by using the finite difference method. An example is illustrated，and it is shown that the displacement and internal force of the compound structure is very significant while considering frost heave effect，which indicates that the frost heaving force should be considered and enough safety margin should be set aside for the design of permafrost slope supporting projects. Comparisons between the model test results and the theoretical calculation show that the values of displacement and internal force of the lattice beam and the anchor tension are basically consistent as well as their variation trends，which indicates that the calculation method of frost heave effect is reasonable and feasible and provides a new idea for the analysis and design of the compound structure of lattice beam and anchor in frozen soil areas.

Key words： soil mechanics permafrost slopes compound structure of lattice beam and anchor frost heave beam on elastic foundation finite difference method

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	Articles by authors
	DONG Jianhua1
	2
	LIU Ke1
	2
	DONG Xuguang1
	2
	SUN Guodong1
	2

Cite this article:

DONG Jianhua1,2,LIU Ke1, et al. A calculation method of frost heave effect of lattice beam and anchor composite structure in cold regions#br#[J]. , 2020, 39(5): 984-995.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0637 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I5/984

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