钻孔灌注桩桩端沉渣的冲洗和注浆处理效果试验研究  

Experimental Study on Treatment of Cleaning and Grouting of Sediments at Bottom of Bored Piles

作　　者：樊荣霞 詹少全[2] 陈翀[3] FAN Rongxia;ZHAN Shaoquan;CHEN Chong(Survey and Design of Nanjing Hydraulic Research Co.Ltd.,Nanjing 210029;No.814 Geological Division,East China Bureau of Mineral Exploration and Development,Zhenjiang 212005;Jiangsu Nonferrous Metals East China Geological Exploration Bureau,Nanjing 210007)

机构地区：[1]南京水科院勘测设计有限公司,南京210029 [2]江苏省有色金属华东地质勘查局八一四队,江苏镇江212005 [3]江苏省有色金属华东地质勘查局,南京210007

出　　处：《土工基础》2024年第1期125-128,共4页Soil Engineering and Foundation

摘　　要：通过对钻孔灌注桩的桩端沉渣冲洗及注浆处理,改善其承载性状,使之能承受一定荷载。由于地质条件、施工工艺等因素,钻孔灌注桩易出现较厚的沉渣,其静载试验的荷载~沉降(Q~s)曲线呈陡降型,总沉降偏大,承载力一般不能满足要求。通过桩顶钻孔,利用高压水冲洗排渣,联合桩端注浆,产生挤密和凝聚固结效应,改善桩端处的承载特性,提高其强度和刚度,减小桩端沉降,提高单桩承载力。基于处理前后的试验数据对比情况,桩端处的承载特性明显改善,对于桩端沉渣缺陷的工程处理应用具有一定指导作用。Through the cleaning the sediment at the bottom of the bored piles and grouting treatment,the bearing behavior can be improved so that it can take the design load.Due to geological conditions,construction methods and other factors,the bored and cast-in-place concrete piles are prone to accumulate thick sediment at the bottom of the borehole.The load settlement(Q~S)curve of the static load test shows a steep drop type,the total settlement is too large,and the bearing capacity generally cannot meet the design requirements.Through the pile top drilling,high-pressure water flushing and waste removal,combined with pile end grouting to produce compaction,condensation,and consolidation effects,improve the axial bearing characteristics at the pile end,improve its strength and stiffness,reduce the settlement at the pile end and improve the axial bearing capacity of a single pile.Therefore,the comparison of the axial bearing characteristics of the pile end before and after the test can significantly improve the axial bearing characteristics of the pile end.

关 键 词：沉渣 桩端注浆 钻芯法 静载试验 

分 类 号：TU473[建筑科学—结构工程]