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通过研究软土地基中静压桩的承载性状发现,静压桩的单桩承载力随时间的提高主要来源于桩侧摩阻力的增长,而桩端阻力变化对承载力的时间效应影响较小。静压桩承载力随时间增长的关系可以用对数曲线描述。根据静压桩的贯入机制,将沉桩过程模拟为半无限土体中一系列球孔的连续扩张,土体假定为Mohr-Coulomb材料。基于球孔扩张理论,计算出不同时期桩侧极限摩阻力和桩端阻力,从而进一步求得不同休止期的静压桩极限承载力。与现场试验资料对比分析表明,计算值与实测值的变化规律一致,且误差较小,能够满足工程需要。
By studying the bearing capacity of static pressure pile in soft soil foundation, it is found that the increase of bearing capacity of static pressure pile with time mainly comes from the increase of friction resistance of pile side, while the change of pile end resistance has less effect on the time effect of bearing capacity . The relationship between the bearing capacity of static pile and the growth over time can be described by a logarithmic curve. According to the penetration mechanism of static pile, the pile sinking process is simulated as a continuous expansion of a series of spherical holes in a semi-infinite soil body. The soil is assumed to be Mohr-Coulomb material. Based on the ball-hole expansion theory, the ultimate friction and pile-end resistance of piles on different sides are calculated, and the ultimate bearing capacity of static pile at different rest periods is obtained. Compared with field test data, it shows that the variation of calculated value and measured value are consistent and the error is small, which can meet the engineering needs.