静压钢管注浆微型桩承载性能试验研究

doi:10.16285/j.rsm.2017.S2.045

›› 2017, Vol. 38 ›› Issue (S2): 323-329.doi: 10.16285/j.rsm.2017.S2.045

静压钢管注浆微型桩承载性能试验研究

宗钟凌^{1, 2}，鲁先龙³，李青松^{1, 2}，张振东¹

1. 淮海工学院土木与港海工程学院，江苏连云港 222005； 2. 江苏省海洋资源开发研究院，江苏连云港222005； 3. 中国电力科学研究院, 北京102401

收稿日期:2017-08-02 出版日期:2017-11-23 发布日期:2018-06-05
作者简介:宗钟凌，男，1979年生，博士，副教授，主要从事软土地基处理方面的研究。
基金资助:
江苏省自然科学基金项目（No. BK2012239）；江苏省“六大人才”高峰项目（No. 2016-JZ-066）。

An experimental study of bearing capacity of post-grouting jacked steel pipe micropiles

ZONG Zhong-ling^1,2, LU Xian-long³, LI Qing-song^1,2, ZHANG Zhen-dong¹

1. College of Civil and Harbour Engineering, Huaihai Institute of Technology, Lianyungang, Jiangsu 222005, China; 2. Marine Resources Development Institute of Jiangsu, Lianyungang, Jiangsu 222005, China; 3. China Electric Power Research Institute, Beijing 102401, China

Received:2017-08-02 Online:2017-11-23 Published:2018-06-05
Supported by:
This woke was supported by the Natural Science Foundation of Jiangsu Province(BK2012239) and Six Talent Peaks Project in Jiangsu Province(2016-JZ-066).

摘要/Abstract

摘要： 提出一种静压钢管注浆微型桩成桩工艺，包括混合注浆液（磷尾矿砂、水泥两种粉料与水混合）的配比设计与微型桩成桩施工方法。通过配比试验，分析水灰比（w/c）、磷尾矿砂与水泥质量比（s/c）对抗压强度的影响。通过现场7根短桩、6根长桩的注浆与抗压承载力试验，研究注浆液类型、两阶段注浆工艺、注浆体积与微型桩抗压极限承载力之间的关系，将实测结果与现行桩基规范及FHWA（Federal High Way Administration）微型桩施工手册和施工指导手册的计算结果进行了比较，研究结果表明，混合注浆液比水泥净浆早期硬化快，28d强度相当，配比为w/c=0.6、s/c=0.5时可以满足强度与注浆工艺要求；注浆后微型钢管桩抗压极限承载力提高了75%～150%；注浆量为3倍钢管体积的微型桩，极限承载力实测值约是现行规范计算值的1.33倍，与FHWA计算结果接近。

关键词: 微型桩, 静压桩, 压力注浆, 抗压承载力, 水灰比

Abstract: A new formation technology of post-grouting jacked steel pipe micropiles is presented, including mixture grout (tailing sands and cement mixed in water) ratio test and construction technology. Ratio tests are conducted to analyze the compression strength under influence of water-cement ratios and tailing sand mass-cement mass ratios. The compression tests on 7 short piles and 6 large piles are carried out at the field site; the relationships between mixture grout types, grouting methodology, mixture grout volume and ultimate compression bearing capacity are studied; and then the test results are also compared with the calculated results of standards in operation and miniature pile construction manuals and instruction of federal highway administration(FHWA). Research results show that the mixture grout early hardening is faster than neat cement grout and no significant difference of 28d strength; the strength and grouting technology can be met with w/c = 0.6 and s/c = 0.5; the ultimate compression bearing capacity of post-grouting micropiles increase by 75%-150%; the test results are 1.33 times that of the calculated values, and similar with that of the FHWA calculated values.

Key words: micropile, jacked pile, pressure grouting, compression bearing capacity, water-cement ratios

中图分类号:

TU 473

宗钟凌，鲁先龙，李青松，张振东，. 静压钢管注浆微型桩承载性能试验研究[J]. , 2017, 38(S2): 323-329.

ZONG Zhong-ling, LU Xian-long, LI Qing-song, ZHANG Zhen-dong，. An experimental study of bearing capacity of post-grouting jacked steel pipe micropiles[J]. , 2017, 38(S2): 323-329.

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静压钢管注浆微型桩承载性能试验研究

An experimental study of bearing capacity of post-grouting jacked steel pipe micropiles

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