透水管桩现场试验光纤监测与承载性能研究

doi:10.16285/j.rsm.2020.1648

岩土力学 ›› 2021, Vol. 42 ›› Issue (7): 1961-1970.doi: 10.16285/j.rsm.2020.1648

透水管桩现场试验光纤监测与承载性能研究

王静¹，肖涛²，朱鸿鹄¹，梅国雄²，刘拯源¹，魏广庆³

1. 南京大学地球科学与工程学院，江苏南京 210023；2. 广西大学土木建筑工程学院，广西南宁 530004； 3. 苏州南智传感科技有限公司，江苏苏州 215123

收稿日期:2020-11-04 修回日期:2021-03-29 出版日期:2021-07-12 发布日期:2021-07-19
通讯作者: 朱鸿鹄，男，1979年生，博士，教授，博士生导师，主要从事地质工程、岩土力学方面的教学和研究工作。E-mail: zhh@nju.edu.cn E-mail:wangjing@smail.nju.edu.cn
作者简介:王静，男，1997年生，硕士研究生，主要从事岩土工程监测和桩−土相互作用研究。
基金资助:
国家自然科学基金项目（No. 51878185，No. 41722209）；国家重点研发计划课题（No. 2018YFC1505104）。

Study on bearing capacity of permeable pipe pile by field optical fiber monitoring

WANG Jing¹, XIAO Tao², ZHU Hong-hu¹, MEI Guo-xiong², LIU Zheng-yuan¹, WEI Guang-qing³

1. School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, China; 2. College of Civil Engineering and Architecture, Guangxi University, Nanning, Guangxi 530004, China; 3. Suzhou Nanzee Sensing Technology, Ltd., Suzhou, Jiangsu 215123, China

Received:2020-11-04 Revised:2021-03-29 Online:2021-07-12 Published:2021-07-19
Supported by:
This work was supported by the National Natural Science Foundation of China (51878185, 41722209) and the National Key Research and Development Program of China (2018YFC1505104).

摘要/Abstract

摘要： 在软土地基中设置透水管桩可以加快沉桩引起的超静孔隙水的消散速率，进而加速桩周土的固结。目前，国内外对透水管桩承载力和透水性能的模型试验和数值模拟研究较多，但深入探究桩基承载力时间效应和荷载传递规律的现场试验研究较少。通过基于光纤布拉格光栅（FBG）的现场静载试验，研究了软土地基中透水管桩桩身应变分布及内力传递规律，并分析了桩身不同位置处桩?土界面超孔隙水压力随时间的变化规律与桩基承载力时间效应的关系。试验结果表明：沉桩结束前期，透水管桩的单桩竖向抗压承载力增长率较高，并且随时间逐渐降低；试验场地条件下，沉桩后10 d内透水管桩承载力的提高主要来源于桩侧摩阻力，10～24 d内桩端阻力对桩基承载力提高的贡献明显增加；桩?土界面的超孔压沿桩深度增加，随着桩端附近超孔压加速消散，土体有效应力增大，桩侧摩阻力和桩端阻力也随之增大。研究成果对软土地基中透水管桩的设计和施工具有一定的指导意义。

关键词: 透水管桩, 光纤布拉格光栅（FBG）, 承载性能, 桩基内力, 超孔隙水压力

Abstract: Permeable pipe piles are set in the soft soil foundation to accelerate the dissipation rate of excess pore water pressure induced by pile driving and then to accelerate the consolidation of soil around the pile. At present, there are many studies, including model tests and numerical simulation, on the bearing capacity and permeability performance of permeable pipe piles. However, few field tests have been conducted to deeply study the time effect of bearing capacity and load transfer law of permeable pipe piles. Based on the fiber Bragg grating (FBG) technology, the static load tests were carried out to study the strain distribution and internal force transfer of the permeable pipe pile in soft soil foundation. Meanwhile, the relationship between the variation of excess pore water pressure of the pile-soil interface with time at different positions of the pile body and the time effect of bearing capacity of the permeable pipe pile was analyzed. The test results showed that at the early stage of pile driving, the growth rate of bearing capacity of a single permeable pipe pile under increased vertical loads was higher, and then gradually decreased with time. Under the test site conditions, the improvement of the bearing capacity of the permeable pipe pile within 10 days was mainly attributed to the pile side friction, whereas the pile tip resistance made more contribution to the improvement of bearing capacity within 10-24 days. The excess pore water pressure of the pile-soil interface increased along with the depth of the pile. With the rapid dissipation of excess pore water pressure near the pile tip, the effective stress of soil gradually increased, and the pile side friction and pile tip resistance also increased. This study provides an improved insight into the design and construction of permeable pipe piles in soft soil foundation.

Key words: permeable pipe pile, fiber Bragg grating (FBG), bearing capacity, internal force of pile, excess pore water pressure

中图分类号:

TU 473

王静, 肖涛, 朱鸿鹄, 梅国雄, 刘拯源, 魏广庆, . 透水管桩现场试验光纤监测与承载性能研究[J]. 岩土力学, 2021, 42(7): 1961-1970.

WANG Jing, XIAO Tao, ZHU Hong-hu, MEI Guo-xiong, LIU Zheng-yuan, WEI Guang-qing, . Study on bearing capacity of permeable pipe pile by field optical fiber monitoring[J]. Rock and Soil Mechanics, 2021, 42(7): 1961-1970.

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透水管桩现场试验光纤监测与承载性能研究

Study on bearing capacity of permeable pipe pile by field optical fiber monitoring

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