Elastic foundation beam model for frost heave damage of trapezoidal canal lining considering frost heave force and adfreeze force [考虑冻胀力和冻结力作用的梯形渠道衬砌冻胀破坏弹性地基梁模型]

作者：He P.; Ma W.; Mu Y.^*; Dong J.; Huang Y.

来源：Journal of Central South University(Science and Technology), 2021, 52(11): 4148-4157.

DOI：10.11817/j.issn.1672-7207.2021.11.034

• Adfreeze force
• Canal lining
• Elastic foundation beam
• Frost heave damage

The relationship between the normal frost-heave force and the interface adfreeze force was considered, the frost heave failure mechanical model of the trapezoidal channel lining in the open system was established based on the elastic foundation beam theory, and the analytical solution was obtained to calculate deformation and internal force of lining. The correctness of the calculation was verified against an existing experimental and analytical results. The results show that the maximum frost-heave displacement of the slope lining occurs at distance from the position of 43% of the slope lining based on an engineering case, and the maximum bending moment occurs at distance from the position of 25% of the slope lining. This is corresponding to the existing result that the lining failure takes place at a distance of 25% to 45% lining length from the toe. Moreover, the interface adfreeze force has a little effect on deflection and shear force of the lining, but it has a greater effect on the bending moment of lining. The adfreeze force is an eccentric load acting on the beam, and has a positive superimposition effect on the bending moment. Therefore, in the design process, when only the stiffness of the lining is considered, the effect of adfreeze force may not be considered; but when focusing on the strength of the lining, the influence of the interface adfreeze force should be considered.

• 单位
  冻土工程国家重点实验室; 中国科学院大学