中文摘要：

为了对静钻根植抗拔桩的承载性能进行研究,进行一组现场静载试验和有限元软件ABAQUS模拟计算.通过将模拟计算与现场实测荷载位移曲线进行对比验证所建立模型的可靠性.模拟结果表明：由于桩端水泥土扩大头的存在,静钻根植抗拔桩的荷载位移曲线比较平缓,桩端扩大头直径越大,桩基荷载位移曲线越平缓;桩周水泥土与桩端水泥土弹性模量的改变对静钻根植抗拔桩承载力的影响不大;在软土地区中桩侧摩阻力较小,静钻根植抗拔桩的抗拔承载力主要由桩端水泥土扩大头提供,增加桩身钻孔直径不利于静钻根植抗拔桩承载性能的发挥;桩端扩大头高度对静钻根植抗拔桩承载力影响不大,而静钻根植抗拔桩承载力随着扩大头直径的增加而增大.在实际工程中在保证桩端水泥土强度的前提下可以将桩端水泥土扩大头直径增加到2倍桩身钻孔直径.

英文摘要：

A group of field tests and finite element software ABAQUS were used to investigate the uplift bearing capacity of the static drill rooted nodular pile. The numerical simulation result was verified to be reliable by being compared to the measured results. The simulation results show that the load-displace- ment curve of the static drill rooted nodular pile under tension appears to be stable because of the existence of the enlarged pile base, moreover, the curve becomes more flat with the diameter of the enlarged pile base increasing. The modulus of the cemented soil along the shaft and the cemented soil at the enlarged base both have little influence on the uplift bearing capacity of the static drill rooted nodular pile. The up- lift bearing capacity of the static drill rooted nodular pile is supported mainly by the enlarged pile base in soft soil areas where the amount of the skin friction is small, and to increase the diameter of the drilling hole along the shaft will decrease the bearing capacity of the enlarged pile base. The height of the enlarged cemented soil base has little influence on the uplift bearing capacity of the static drill rooted nodular pile, while the uplift bearing capacity of the static drill rooted nodular pile will increase with the diameter of the enlarged pile base increasing. As a result, the diameter of the enlarged base can be amplified to 2 times of the diameter of the drilling hole along the shaft on condition that the strength of the cemented soil is guaranteed.