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本文主要阐述钢筋混凝土桥桩在季节性冻土中切向冻胀力的试验研究情况及其对桩基作用的分析,重点介绍了两个冻土试验场的现场真形试验和室内模型试验及冻胀桥桩检算等,提出了季节性冻土单位切向冻胀力值、及其沿冻深分布规律和主要影响因素等。根据切向冻胀力对桩基作用的分析,提出了钢筋混凝土桩抗冻拔稳定的两个条件,并合理地确定了计算式中有关参数。文中还根据试验场冻胀性试验得到的土的冻胀性与冻结深度的关系,提出了依据土的冻胀率修正标准冻深的方法,推出修正标准冻深公式并给定修正值。
In this paper, the experimental research on the tangential frost heave force of reinforced concrete bridge piles in seasonal frozen soil and its effect on pile foundation are mainly described. The field truss test and indoor model test of two frozen soil test sites are introduced in detail. Such as the calculation of frost heave piles, the tangential frost heaving force value of seasonal permafrost unit and its distribution along the freezing depth and the main influencing factors. According to the analysis of the effect of tangential frost heaving force on the pile foundation, two conditions for anti-freezing stability of the reinforced concrete pile are proposed, and the relevant parameters in the calculation formula are reasonably determined. Based on the relationship between the frost heave and the freezing depth of the soil obtained from the frost heave test in the test site, a method of correcting the standard frost depth based on the frost heave rate of the soil is proposed. The revised standard freezing depth formula is given and the correction value is given.