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通过对同一场地、相同桩型、不同桩体时隔40天的静载试验Q–s曲线的对比分析,论述了人工挖孔类的混凝土桩的承载力不会随着时间的推移而有所提高,即承载力不存在时间效应问题。通过对同一扩底短桩的两次静载试验的承载力比较,认为其承载力的提高,完全是由于桩侧和桩端土体的压实重塑导致土体强度的提高所引起的。同一桩的二次静载试验存在着时间效应,与第一次试验的时间间隔越长,桩的承载力会有不同程度的提高。
By comparing and analyzing the Q-s curve of static load tests of the same site, the same pile type and different pile bodies after a lapse of 40 days, the paper points out that the bearing capacity of concrete piles with manual hole digging will not change with the passage of time Improve, that is, there is no bearing capacity of the time effect of the problem. Through comparing the bearing capacity of two static tests of the same expanded short pile, it is considered that the increase of bearing capacity is entirely due to the increase of soil strength due to the compaction and remodeling of the soil on pile side and pile end. There is a time effect on the second static load test of the same pile. The longer the first test interval, the higher the bearing capacity of the pile will be.