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在桩身预埋FBG(fiber bragg gating)光纤传感器,利用静压桩隔时复压试验的优势,观测开口PHC管桩的承载力、桩端阻力以及桩侧摩阻力随休止时间的变化情况。试验表明,桩极限承载力在沉桩结束一定时间范围内随时间大致呈对数型增长,沉桩284 h后提高幅度达140%,时效性系数为0.52;桩端阻力和桩侧摩阻力在休止期内的提高幅度分别为6.28%和475.37%,说明试验场地条件下试桩承载力的提高主要源于桩侧摩阻力。试验结果显示,桩极限承载力及桩侧摩阻力的发展符合3阶段增长模型,时间界点分别为21.5 h和279 h。研究成果可为基桩时效性研究及相关设计提供依据。
FBG (fiber bragg gating) fiber sensor is embedded in the pile body, and the advantage of the pressure test during static pressure piles is used to observe the change of bearing capacity, pile end resistance and pile friction of the open PHC pile with pause time. The experimental results show that the ultimate bearing capacity of piles increases with logarithmic growth over time within a certain period of time after pile sinking, with the increase rate of 140% after 284 h and the timeliness coefficient of 0.52. The increase during the rest period was 6.28% and 475.37%, respectively, indicating that the increase of test pile bearing capacity under test conditions is mainly due to pile side frictional resistance. The test results show that the development of pile ultimate bearing capacity and pile-side friction meet the 3-stage growth model with time lags of 21.5 h and 279 h respectively. The research results can provide the basis for the research on the time-effectiveness of piles and related design.