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在深厚软土地区采用锤击法进行预应力管桩施工,由于土体受到剧烈扰动及软土较差的渗透性,会在桩周软土中产生很高的超静孔隙水压力。通过对现场实测超静孔隙水压力资料的分析和整理,探讨增强型离心桩施工产生的超静孔隙水压力在径向及深度上的分布规律,研究单桩施工不同时刻超静孔隙水压力变化规律。分析结果表明:单桩的沉桩显著影响范围为17.5倍桩径,超静孔隙压力的峰值并不一定出现在末节管桩施工结束后,另外,增强型离心桩单桩施工产生的超静孔隙水压力比普通的预应力管桩产生的超静孔隙水压力消散得快,在施工结束4h后,可以消散70%～80%。
In the deep soft soil area, the hammering method is adopted to prestressed pipe pile construction. Due to the violent disturbance of the soil mass and the poor permeability of soft soil, high excess pore water pressure will be produced in the soft soil around the pile. Through the analysis and arrangement of the measured data of excess pore water pressure in the field, the distribution rules of the excess pore water pressure generated by the enhanced centrifugal pile in the radial direction and the depth are discussed. The variation of the excess pore water pressure at different times of single pile construction law. The analysis results show that the significant influence range of pile settlement is 17.5 times of pile diameter. The peak of excess pore pressure does not necessarily appear after the construction of the end pipe pile. In addition, the excessively static pore produced by the construction of reinforced centrifugal pile The water pressure dissipates faster than the excess pore water pressure generated by ordinary prestressed pipe piles, and dissipates 70% to 80% after 4 hours at the end of construction.