土工基础

›› 2018, Vol. 32 ›› Issue (4): 445-448.

• 工程实录 • 上一篇    下一篇

宁波轨道交通静钻根植桩的承载力自平衡测试

徐胜锋1，陈洪雨2，张正龙1，朱建民1   

  1. （1.南京东大自平衡桩基检测有限公司，南京 210018;2.宁波浙东建材集团有限公司，浙江宁波 315000）
  • 收稿日期:2017-08-31 修回日期:2017-09-25 出版日期:2018-08-20 发布日期:2018-08-23
  • 作者简介:徐胜锋（1974-），男，工程师，研究方向为桩基检测。

Self-balance Load Test of Axial Capacity of JZGZ Piles in the Ningbo Metro Project

XU Shengfeng1, CHEN Hongyu2， ZHANG Zhenglong1， ZHU Jianmin1   

  1. (1.Nanjing Dongda Selfbalance Pile Test, Co., Ltd., Nanjing 210018；2.Ningbo Zhedong Building Material Group Co., Ltd., Ningbo 315000)
  • Received:2017-08-31 Revised:2017-09-25 Online:2018-08-20 Published:2018-08-23

摘要： 在宁波轨道交通建设过程中，采用了一种新型的静钻根植桩基础，其成桩方式为：施工钻进到位后扩底，然后注入水泥浆，边提钻边搅拌，最后下放预制竹节桩。静钻根植桩结合了钻孔桩、预制桩和深层搅拌桩的优点，是一种新的组合式桩基础，可大幅改善桩基承载性能。结合静钻根植桩的竖向承载力测试，采用自平衡法检测了2根试桩。现场情况表明，自平衡法能很好的适用于静钻根植桩承载力检测，2根试桩的竖向承载力均满足设计要求，并且其荷载-沉降曲线大体呈直线型，承载性能良好。

关键词: 静钻根植桩, 承载力, 自平衡法

Abstract: During the construction of Ningbo rail transit, a new type of pile foundation  JZGZ pile was adopted. When the borehole is drilled to the designed elevation, the base of the current segment is expanded and then the cement slurry is injected and mixed with the soil; finally, the prefabricated pile is installed with enlarged joints. The JZGZ pile combines the advantages of drilled pile, prefabricated pile and deepmixing column. Its bearing capacity can be improved remarkably. In this paper, the selfbalanced method is applied to the vertical bearing capacity testing of the two JZGZ piles. It is concluded that the selfbalanced method is suitable for the JZGZ pile static load test. The measured results indicate that the axial capacity of the test piles met the design requirements. The loadsettlement curves of the two piles are roughly liner, and it shows that the JZGZ pile has good axial capacity.

Key words: JZGZ Pile, Pile Axial Capacity, Selfbalanced Load Test Method