深厚软土地区长钻孔灌注桩后注浆试验研究  

Post-grouting in-situ of length bored pile in deep soft regions

作　　者：邹金锋[1,2] 安爱军[1] 邓宗伟[1] 肖华溪[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075 [2]湖南省交通规划勘察设计院,湖南长沙410008

出　　处：《中南大学学报（自然科学版）》2011年第3期823-828,共6页Journal of Central South University:Science and Technology

基　　金：高等学校博士点新教师基金资助项目(20090162120039);博士后科学基金资助项目(20090461021);铁道部科技研究开发计划重点项目(2008G032–3)

摘　　要：对深厚软土地区长钻孔灌注桩的后注浆试验结果进行研究,获得各级荷载作用下桩身轴力和桩侧摩阻力随桩身深度的变化规律、桩顶荷载-位移-时间曲线。研究结果表明:当注浆量不超过3 t且注浆压力为1～3 MPa时,桩侧摩阻力占总荷载的93%左右,桩端轴力只占桩顶荷载的5%左右;当桩顶荷载为4.6 MN时,桩侧注浆可减小桩顶位移23%左右,桩端注浆可减小桩顶位移32%左右;桩侧和桩端后注浆技术是减小桩基工后沉降的有效方法之一。According to the in-situ test,the rule of load transmission property for axial force and frictional resistance in pile,the load-displacement-time curve at the pile top was obtained.The results show that when the grouting pressure is 1-3 MPa and grouting capacity is about 3 t,the frictional resistance around pile accounts for about 93% of the load,and axial force in pile accounts for about 5%.When the load is 4.6 MN,the displacement of pile top is decreased by about 23% through grouting around pile side and 32% through grouting around pile tip.The grouting method is one of effective technologies for the decrease and acceleration of settlement after construction.

关 键 词：深厚软土 后注浆 冲水压力 钻孔灌注桩 

分 类 号：TU473.1[建筑科学—结构工程]