钻孔灌注桩桩端后注浆增强效应研究  

Research on the pile-base post-grouting enhancement effect of bored pile

作　　者：曾志军[1,2] 刘建华[1] 张瑞坤[1] 石名磊[1] 

机构地区：[1]东南大学交通学院,江苏南京210096 [2]海军工程设计研究院,北京100070

出　　处：《中国矿业大学学报》2014年第1期144-150,共7页Journal of China University of Mining & Technology

基　　金：住房和城乡建设部研究开发项目(2008-k2-12)

摘　　要：后注浆补强技术对桩端沉渣和桩侧泥皮问题具有改善作用,采用单桩静载荷平行对比试验,分析了桩端后注浆悬浮、嵌岩和扩底桩的荷载传递特征,讨论了后注浆桩加载初期刚度相对未注浆桩偏低的异变现象,结果表明:后注浆桩的端阻、侧阻增强效应发挥存在滞后性特征,持力层显著影响桩端后注浆桩的增强效应;极限状态下使用桩端后注浆减小深长悬浮桩沉降的作用有限,悬浮桩桩端后注浆端阻增强会产生附加沉降效应.The pile-base p ment and side mud skin p erature analysis, the load with pile-base post-grouti stiffness of post-grouting ost-grouting technology was emerged to solve the bored pile end sedi roblems. transfer Through characters ng were analyzed. piles was lower th the comparable static loading tests of piles and lit- of floating, rock-socketed and pedestal bored piles The abnormal phenomena which the initial loading an that without post-grouting was discussed. The results show that the pile end and side resistance enhancement effect has the hysteresis feature. The enhancement effect is significantly affected by the different pile bearing strata. The settle- ment-reducing effect of bored pile-base post-grouting is limited in service ability limit state, and the additional settlement effect of end resistance enhancement of pile with post-grouting will be produced.

关 键 词：桩端后注浆 深长灌注桩 荷载传递 静载荷试验 异变现象 

分 类 号：TU473[建筑科学—结构工程]