利用高压喷射注浆法处理桩底夹层缺陷

Use of High-pressure Jet Grouting Method to Treat Sandwich Defect at Bottom of Pile

该文阐述了某工程嵌岩桩桩底存在强风化夹层,经方案比选后确定采用高压喷射注浆法处理其缺陷。合理设计喷嘴的类型、压力、喷嘴直径、喷嘴数量等技术参数是决定对夹层置换程度的关键因素,也是该方案的技术难点。夹层全置换完成后高压注入水泥浆填充空洞并与上下微风化层胶结,从而确保桩端持力层的完整性。该方法可供同行参考。

The article sets forth the strong weathering sandwich existing at the bottom of rock-socketed pile in a project.After the comparison and selection of schemes,the high-pressure jet grouting method is determined to treat its defect.The reasonable design of nozzle type,pressure,diameter and number is the key factor to determine the sandwich replacement level,and is also technical difficulty of this scheme.The cement mortar is filled into the caves by high pressure after the sandwich is fully replaced,and it is cemented with the upper and lower weak weathering stratum so as to ensure the integrity of the pile-end supporting layer.This method can be referred for the similar projects.