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【目的】探讨高地下水位弧底梯形渠道混凝土衬砌结构冻胀破坏的力学模型,为实际工程中衬砌体的设计与建设提供参考。【方法】根据冻土力学、材料力学及高等数学知识,提出渠道坡板的计算简图是在法向冻结力、切向冻结力和法向冻胀力共同作用下的简支梁,渠底板是与两衬砌相互作用的压弯构件,进而依据合理的简化和假设,提出并建立高地下水位弧底梯形渠道混凝土冻胀破坏的力学模型,并进行了实例应用研究。【结果】通过建立的高地下水位弧底梯形渠道混凝土冻胀破坏力学模型,不仅能计算出弧底梯形渠道坡板、底板的控制内力及最大弯矩作用点,而且可以计算出渠道衬砌渠坡板所受的法向冻结力,并可估计混凝土板可能发生胀裂的位置。【结论】弧底梯形渠道混凝土衬砌结构法向冻胀力小,法向冻结力作用点在距渠顶1/5处,整体变形及抗冻胀能力强,并优于梯形渠道,为以后的渠道防冻胀设计提供了科学依据。
【Objective】 The purpose of this study is to investigate the mechanical model of frost heave failure of concrete lining structure with arc-bottom trapezoidal canal in high groundwater level, and to provide references for the design and construction of lining in actual engineering. 【Method】 According to the knowledge of permafrost mechanics, material mechanics and advanced mathematics, the calculation diagram of channel slope is proposed. It is a simple supported beam and canal floor under the action of normal freezing force, tangential freezing force and normal frost heaving force Is a bending and bending component that interacts with the two linings. Based on reasonable simplifications and assumptions, a mechanical model for the frost heave failure of concrete with trapezoidal channel at the groundwater level is put forward and established. The case study is also given. 【Result】 Through the established mechanical model of frost heave failure of concrete with trapezoidal channel with high groundwater level, not only the controllable internal force and the maximum bending moment of slope and trapezoid channel can be calculated, but also the canal liner slope can be calculated The plate is subjected to normal freezing force and can estimate where the concrete slab may burst. 【Conclusion】 The normal frost heave force of the concrete lining structure with trapezoidal channel is small and the normal freezing point is 1/5 of the top of the canal. The overall deformation and anti-frost heaving ability is better than trapezoidal channel, Channel frost heave design provides a scientific basis.