粉土及粉质黏土对静压沉桩桩端阻力影响机制现场试验

doi:10.13278/j.cnki.jjuese.20190232

吉林大学学报(地球科学版) ›› 2020, Vol. 50 ›› Issue (6): 1804-1813.doi: 10.13278/j.cnki.jjuese.20190232

• 地质工程与环境工程 • 上一篇

粉土及粉质黏土对静压沉桩桩端阻力影响机制现场试验

张明义^1,2, 刘雪颖¹, 王永洪^1,2, 白晓宇^1,2, 桑松魁¹

1. 青岛理工大学土木工程学院, 山东青岛 266033;
2. 山东省高等学校蓝色经济区工程建设与安全协同创新中心, 山东青岛 266033

收稿日期:2019-11-05 发布日期:2020-12-11
通讯作者: 王永洪(1984-),男,讲师,博士,主要从事桩基础工程及岩土工程测试方面的研究,E-mail:hong7986@163.com E-mail:hong7986@163.com
作者简介:张明义(1958-),男,教授,博士生导师,主要从事土力学及地基基础的试验、教学和研究工作,E-mail:zmy58@163.com
基金资助:
国家自然科学基金项目（51778312）；山东省自然科学基金项目（ZR2016EEP06）

Field Test on Influencing Mechanism of Silty Soil and Silty Clay on Tip Resistance of Static Pressure Pile

Zhang Mingyi^1,2, Liu Xueying¹, Wang Yonghong^1,2, Bai Xiaoyu^1,2, Sang Songkui¹

1. School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, Shandong, China;
2. Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao 266033, Shandong, China

Received:2019-11-05 Published:2020-12-11
Supported by:
Supported by National Natural Science Foundation of China (51778312) and Natural Science Foundation of Shandong (ZR2016EEP06)

摘要/Abstract

摘要： 为探讨在粉土及粉质黏土中桩端阻力随贯入深度的变化规律，通过在试验桩P1的桩端安装轮辐压力传感器，以及在试验桩P1、P2距桩端200 mm处安装光纤光栅（FBG）传感器，采用两种不同的测试技术全程监测了两根闭口预应力高强度混凝土（PHC）管桩现场贯入过程中的桩端阻力。试验结果表明：桩端阻力与土层的变化密切相关，土层越硬，桩端阻力越大，当桩端从粉质黏土层进入粉土层时，桩端阻力明显增大，粉土中的桩端阻力达到粉质黏土层的2倍；整个贯入过程中，同一土层不同位置的差异性对桩端阻力也存在较大影响，在距离地面1.50 m处，P1和P2桩FBG传感器桩端阻力的差值达到了89.29 kN，而在距离地面3.50~4.50 m处，两桩的桩端阻力则相差较小。

关键词: 静压桩, 轮辐压力传感器, FBG传感器, 桩端阻力, 现场试验

Abstract: In order to investigate the variation of pile end resistance with penetration depth in silt and silty clay, a spoke pressure sensor was installed at the pile end of the test pile P1, and a fiber grating sensor was installed at the test pile P1 and P2 200 mm away from the pile end. Two different test techniques were used to monitor the pile end resistance during the on-site penetration of two closed-end prestressed high-strength concrete pipe piles. The test results show that the resistance of the pile end is closely related to the change of the soil layer. The harder the soil layer is, the greater the resistance of the pile end is. When the pile end enters the silt layer from the silty clay layer, the pile end resistance increases significantly. The pile end resistance in the silt reaches twice of that of the silty clay layer. During the whole penetration process, due to the difference of soil layers at different locations, there is a certain difference between the pile end resistance of P1 and P2. The position difference of the same soil layer has a great influence on the pile end resistance. Below the ground 1.50 m, the difference of pile end resistance between P1 and P2 reached 89.29 kN; While below the ground 3.50-4.50 m, the difference between the pile end resistances of the two piles is small.

Key words: static pressure pile, spoke pressure sensor, FBG sensor, pile end resistance, field test

中图分类号:

TU473

张明义, 刘雪颖, 王永洪, 白晓宇, 桑松魁. 粉土及粉质黏土对静压沉桩桩端阻力影响机制现场试验[J]. 吉林大学学报(地球科学版), 2020, 50(6): 1804-1813.

Zhang Mingyi, Liu Xueying, Wang Yonghong, Bai Xiaoyu, Sang Songkui. Field Test on Influencing Mechanism of Silty Soil and Silty Clay on Tip Resistance of Static Pressure Pile[J]. Journal of Jilin University(Earth Science Edition), 2020, 50(6): 1804-1813.

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粉土及粉质黏土对静压沉桩桩端阻力影响机制现场试验

Field Test on Influencing Mechanism of Silty Soil and Silty Clay on Tip Resistance of Static Pressure Pile

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