钻孔扩底灌注桩的承载性状与设计计算  

BEARING PROPERTY AND DESIGNING CALCULATION OF DRILLING BOTTOM-ENLARGED GROUTING PILES

作　　者：陈永贵[1,2] 周德泉[1] 毛广凌 

机构地区：[1]长沙理工大学土木与建筑学院,长沙410076 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]深圳市湛联基础建筑工程有限公司,广东深圳518052

出　　处：《建筑技术》2008年第12期957-959,共3页Architecture Technology

基　　金：国家自然科学基金资助项目(40802064);中国博士后科学基金资助项目(20080430680);上海市博士后科研资助计划项目(08R14155);湖南省自然科学基金资助项目(07JJ4012)

摘　　要：简述钻孔扩底灌注桩的基本原理,通过荷载试验成果分析扩底灌注桩的沉降特性,探讨了扩底桩与直桩之间的受力和破坏机理,研究扩大头桩后压浆机理,并系统阐述钻孔扩底灌注桩的设计计算。结合工程实例,通过与人工挖孔直桩的对比,分析钻孔扩底灌注桩的经济技术特点。结果表明在场地适宜的条件下,钻孔扩底灌注桩与直桩相比具有较高的承载能力和较好的经济效益。Based on the principals of drilling bottom-enlarged grouting piles, its subsidence characteristics were analyzed through the vertical loading test, the bearing and destroying mechanism of the bottom-enlarged and equal-diameter piles were studied, the bearing capacity improved mechanism of the bottom-enlarged piles with post-grouting technology, and the design calculation of the drilling bottom-enlarged troduced. At last, a project of nomical technical effects. The drilling bottom-enlarged grouting piles in Shenzhen was results indicate that the drilling bottom-enlarged grouting piles were intaken to show its ecogrouting piles have a higher bearing capacity and the better economic efficiency in the suitable construction conditions.

关 键 词：桩基础 钻孔扩底灌注桩 承载性状 

分 类 号：TU431[建筑科学—岩土工程] U448.14[建筑科学—土工工程]