深厚软土地区长钻孔灌注桩后注浆试验研究
来源期刊：中南大学学报(自然科学版)2011年第3期
论文作者：邹金锋 安爱军 邓宗伟 肖华溪
文章页码：823 - 828
关键词：深厚软土；后注浆；冲水压力；钻孔灌注桩
Key words：deep soft soil; post-grouting; pressurized water pressure; bored pile
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。
Abstract: 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.
