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目前,对季节冻土地区基桩抗冻拔验算,暖土部分的摩阻力多规定按轴向受拉桩的摩阻力取值。本文根据基桩冻拔的特定受力状态,论述了冻结过程对暖土的冻胀反力作用。提出:冻拔时暖土部分桩土作用机理与摩阻力分布规律,均与轴向受压桩类似,从而提出应按轴向受压桩的摩阻力值进行基桩抗冻拔验算的观点。
At present, the anti-freezing and checking of foundation piles in seasonally frozen ground areas is calculated, and the friction resistance of the warm soil part is stipulated as the value of the friction resistance of axially-pulled piles. In this paper, according to the specific stress state of the frozen pile, the frost heaving reaction of the freezing soil to the warm soil is discussed. It is proposed that the action mechanism and friction distribution law of part of piles in warm soil are similar to that of axially compressed piles in freezing soils, and the viewpoint of anti-freezing and checking of foundation piles should be proposed according to the friction resistance value of axially compressed piles.