后注浆技术在港口工程中的应用及桩基承载力研究

Application of post-grouting in port project and research on bearing capacity of pile foundation

后注浆技术在国内土建领域应用广泛,但在港口工程尤其是海外港口工程中少有应用先例,对后注浆的适应条件和技术参数也缺乏经验参考。结合西非某码头工程,介绍泻湖水域复杂地质条件下的灌注桩后注浆技术的施工工艺和技术参数,探讨后注浆的适应条件和加固效果。结合静载试验,对注浆前后的桩侧、桩端承载力进行研究,并与理论计算值进行对比。结果表明,采用后注浆技术可有效提高桩基承载力但具有一定的适应条件,可为类似港口工程的桩基设计提供参考。

Post-grouting technology is widely used in the domestic civil engineering field,but there are few precedents in port,especially overseas port projects.There is also a lack of experience and reference for the adaptation conditions and technical parameters of post-grouting.Combining with a wharf project in West Africa,we introduce the construction process and technical parameters of post-grouting technology for cast-in-place piles under complex geological conditions in lagoon waters,and discuss adaptive conditions and consolidation effect of post-grouting.Combining with static load tests,we study the bearing capacity of the pile side and pile end before and after grouting,and compare test values with theoretical calculation values.The results show that the use of post-grouting technology can effectively improve the bearing capacity of pile foundation,but it has certain adaptability conditions,which can provide references for pile foundation design in similar port projects.