复杂地质条件下PHC桩可打性与实际沉桩全程动测对比分析

针对复杂地质条件下经常出现基桩难以入土至设计高程等异常情况影响施工的问题,研究了基桩可打性和沉桩过程质量控制方法。基于坦桑尼亚达累斯萨拉姆港改扩建工程,采用对典型地质钻孔处桩基进行GRLWEAP可打性和沉桩过程高应变全程动测对比分析的方法,得出结论:利用全程动测结果可以对可打性分析中的土层参数进行更符合实际的修正。研究结果表明:参考类似土层参数修正值进行调整后的GRLWEAP可打性分析和高应变全程动测不仅能为PHC桩沉桩施工提供理论支持,还能实时监控沉桩过程以进行质量控制。

Comparative analysis of drivability of PHC piles and whole-process PDA during pile sinking under complex geological conditions

Aiming at the problem that abnormal conditions such as the difficulty for foundation piles to be penetrated into the designed height and affect the construction under complex geological conditions,the drivability of foundation piles and the quality control methods of the pile sinking process are studied.Based on the reconstruction and expansion project of Dares Salaam Port in Tanzania,the method of conducting a comparative analysis of the GRLWEAP driveability and the whole-process PDA during the pile-sinking process of the pile foundation at the typical geological boreholes is adopted.And the conclusion is that the whole-process PDA results can be used to make more realistic corrections to the soil parameters in the driveability analysis.The research results show that the GRLWEAP driveability analysis after adjustment coucerning similar soil layer parameter correction values and the whole-process PDA can not only provide theoretical support for PHC piles sinking construction but also monitor the piles sinking process in real time for quality control.