成孔切槽引起邻近桩基沉降规律及控制措施  

Additional settlement induced by hole-boring and grooves on an adjacent pile foundation and its control

作　　者：章荣军[1] 郑俊杰[1] 丁烈云[2] 吴贤国[2] 

机构地区：[1]华中科技大学岩土与地下工程研究所,湖北武汉430074 [2]华中科技大学工程管理研究所,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2011年第4期114-118,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：武汉市科技攻关计划项目(200860423194);新世纪优秀人才支持计划资助项目(NCET-06-649)

摘　　要：以武汉地铁二号线循礼门站下穿一号线轻轨桥墩段为背景,采用数值模拟和现场实测方法分析隔离桩成孔及地连墙切槽对邻近轻轨桥墩的影响规律,并对成孔切槽引起桩基沉降机理及各种措施的沉降控制效果展开了深入分析.结果表明:邻近桩基成孔切槽对桩基的影响比较显著,应尽量避免在桩端平面以下位置'掏土';隔离桩及注浆加固的控制效果明显,尤其是后者;必要时适当减小地连墙的分幅宽度也可有效控制桩基的沉降.The deep foundation pit of Xunlimen station of Wuhan Metro Line 2 was studied, which underneath passes the viaduct of Wuhan Light Rail Transit, and a three-dimensional elasto-plastic numerical simulation model was established. The influence of the pore-forming of strengthening piles and grooving of diaphragm walls on adjacent pile foundations was calculated and analyzed. Then the calculated results were compared with field measured data to verify the rationality and accuracy of the numerical model. Finally, this numerical model was employed to analyze the mechanism of the pile settlement due to pore-forming and grooving and evaluate the effect of relevant control measures. Results show that the influence of hole-boring and grooving on adjacent pile foundations is non-ignorable. Drawing out soil beneath the pile toe should be avoided as far in practice. The effects of strengthening piles and grouting reinforcement are significant, especially the latter. If necessary, the pile settlement may also be controlled through reducing the width of the groove section.

关 键 词：桩基 沉降控制 数值模拟 成孔切槽 隔离桩 注浆 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]