嵌岩桩桩端缺陷检测分析讨论

Analysis and discussion on defect detection of rock-socked pile tip

嵌岩灌注桩由于其沉降小、承载力高的优势,应用比较广泛。由于地质条件、施工情况等因素影响,嵌岩灌注桩易出现桩端缺陷,降低单桩承载力,造成安全隐患,影响建设工程质量。利用静载试验、低应变反射波法、钻芯法综合判定桩端施工质量,每种检测方法都具有各自优势,静载试验优势在于桩端承载特性评价,低应变法从桩端应力反射波方面观察,钻芯法更加直观,这些方法相互补充、验证,对于判断桩端缺陷有一定指导意义。

Rock-socketed cast-in-place piles are widely used due to their advantages of small settlement and high bearing capacity.Due to factors such as geological conditions and construction conditions,rock-socketed cast-in-place piles are prone to pile tip defects,reducing the bearing capacity of a single pile,causing safety hazards and affecting the quality of construction projects.The static load test,low strain reflected wave method,and core drilling method were used to comprehensively determine the construction quality of the pile end.Each detection method had its own advantages.The advantage of the static load test lied in the evaluation of the bearing characteristics of the pile end.The low strain method reflected waves from the pile end stress observed from the aspect,the core drilling method was more intuitive.These methods complemented and verified each other,and had certain guiding significance for judging pile end defects.