中文摘要：

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。

英文摘要：

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.