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灌注桩是桥梁和渡槽广泛应用的基础型式之一。在季节性冻土地区,桩基础建筑物在运行中受切向冻胀力的作用,因此,桩基础的设计具有特殊的要求。本文根据近几年现场试验研究的结果,提出了抗冻拔设计的方法及其参数的选择方法。分析了冻深与地下水位和切向冻胀力的关系,论述了切向冻胀力和长期摩阻力的取值范围和方法,以及计算切向冻胀力冻深的建议。文中还对抗冻拔结构及施工工艺提出了应注意采取的措施。
Grouting piles are one of the basic types of bridges and aqueducts widely used. In seasonal permafrost regions, pile foundation structures are subjected to tangential frost heaving forces during operation. Therefore, pile foundation design has special requirements. In this paper, according to the results of field experiments in recent years, the method of anti-freezing design and the method of selecting parameters are put forward. The relationship between freezing depth and groundwater level and tangential frost heave force is analyzed. The range and method of tangential frost heaving force and long-term frictional resistance and the suggestion of calculating frost heave depth of tangential frost heave are discussed. In the article, it also puts forward measures that should be taken to counter the anti-freeze structure and construction technology.