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大量的试验表明,桩受到抗拔和抗压时,其侧摩阻力是不同的,即存在一个抗拔系数。对于工程中抗拔系数的计算,考虑端阻力时更加符合实际情况,以此为出发点对泊松效应下的抗拔系数进行了修正,并得出了存在桩端阻力时,桩顶荷载的抗拔和抗压计算公式,并给出了桩周土层为多层时桩顶荷载的计算思路。最后,对抗拔系数的影响因素进行了分析,得出了抗拔系数的变化规律。
A large number of tests show that when the pile is subjected to anti-pull and anti-compression, the lateral friction is different, that is, there is a coefficient of anti-pull. For the calculation of the pull-out coefficient in engineering, considering the end resistance more in line with the actual situation, the pull-out coefficient under the Poisson effect is amended as a starting point, and the resistance of pile top load Pull and compressive force calculation formula, and gives the calculation of pile top soil when the pile top load. Finally, the influencing factors of anti-pull coefficient were analyzed, and the change rule of anti-pull coefficient was obtained.