梯形渠道固脚抗冻胀力学模型研究

为探明梯形渠道固脚抵抗基土冻胀破坏的机理和能力并为渠道固脚设计提供依据,对砼衬砌梯形渠道坡板和固脚进行简化和假设,运用材料力学、冻土力学等相关理论,分别提出了在法向冻胀力、法向冻结力、切向冻结力作用下的渠坡衬砌的计算简图及在自身重力、被动土压力、切向冻结力、推力作用下的固脚计算简图。在此基础上,建立了渠坡衬砌、固脚的力学模型,给出固脚稳定验算的计算方法并选用工程实例验证了计算方法的合理性,对不满足固脚稳定条件的工程实例,利用Python程序设计语言给出满足条件的固脚最小尺寸。实例计算结果表明,所建立的力学模型正确可行,与工程实际相符合。研究成果可用于指导工程实践。

Study on Mechanical Model of Anti-freeze Expansion of Trapezoidal Channel

In order to find out the mechanism and ability of the trapezoidal channel to resist the heaving frost damage of the foundation soil and provide a basis for the design of the channel solid foot, this paper simplified and assumed the slope and the solid foot of the trapezoidal channel by using the theory of material mechanics and frozen soil mechanics. The calculation sketch of the sloping lining and solid foot was presented respectively. On this basis, the mechanical model of sloping and solid foot was established, and the calculation method of the stability test of the solid foot was given. The engineering example was used to verify the rationality of the calculation method. For the engineering example that does not satisfy the stability condition of the solid foot, the programming language Python was used to give the minimum size of the solid foot that satisfied the condition. The calculation results of the example show that the established mechanistical model was accurate and feasible, which was consistent with the actual project. Furthermore, it can be seen that the selection of a suitable solid foot size can effectively improve the stability of the solid foot and reduce the frost heaving ruin of the channel slope.