黄土地区钻孔灌注桩后注浆承载性状研究  

Study on bearing behavior of post-grouting bored pile in loess areas

作　　者：杜宪莉 DU Xianli(China Railway 19th Bureau Group Co.,Ltd.,Beijing 100176,China)

机构地区：[1]中铁十九局集团有限公司,北京100176

出　　处：《资源信息与工程》2023年第6期83-86,共4页Resource Information and Engineering

摘　　要：钻孔灌注桩是一种常见的桩基础形式,适合于各种地层。在西部黄土地区,钻孔灌注桩施工中不可避免地产生桩侧泥皮和桩底沉渣,可能导致桩的承载力不满足设计要求。以西部黄土区某大型桥梁工程为例,利用后注浆技术对钻孔灌注桩进行补强,通过静载实验、数值模拟等手段分析钻孔灌注桩后注浆承载性状,得出结论:1)静载实验结果显示后注浆可以有效提高黄土地区钻孔灌注桩承载能力,承载能力提升范围在13.85%~42.83%之间;2)数值模拟结果显示后注浆可以有效提高钻孔灌注桩桩侧及桩端岩土的强度,从而提高桩的侧摩阻力和桩端承载力。Bored pile is a common form of pile foundation,suitable for various strata.In the western loess area,bored piles need to face the combined influence of mud skin on the pile side and sediment at the pile bottom,resulting in bearing capacity not meeting design requirements.Taking a large bridge project in the western loess area as an example,the post-grouting technique was used to reinforce bored piles.This paper analyzed the bearing of post grouting of bored piles through static load experiments,numerical simulations,and other means.The following conclusions were drawn:1)The static load test results showed that post grouting can effectively improve the bearing capacity of bored piles in loess areas.The range of improvement in bearing capacity can be between 13.85%and 42.83%.2)The numerical simulation results showed that post grouting can effectively improve the strength of the rock and soil on the side and the end of the bored pile,thereby increasing the lateral friction resistance and bearing capacity of the pile.

关 键 词：黄土地区 钻孔灌注桩后注浆 承载力 

分 类 号：TU47[建筑科学—结构工程]