湿陷性黄土地区劈裂注浆桩芯结石体强度试验研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (4): 1147-1153.

湿陷性黄土地区劈裂注浆桩芯结石体强度试验研究

周茗如^1,2, 李宁¹, 钟琳¹, 李少飞¹

1.兰州理工大学土木工程学院,兰州 730050;
2.西部土木工程防灾减灾教育部工程研究中心,兰州 730050

收稿日期:2020-11-15 修回日期:2021-01-24 出版日期:2021-04-15 发布日期:2021-05-11
通讯作者: 李宁,硕士研究生。E-mail:1059412123@qq.com
作者简介:周茗如(1962—),男,教授。主要从事土木工程材料及地基加固的研究。E-mail:562998591@qq.com
基金资助:
国家自然科学基金(51468039)

Experimental Study on Strength of Split Grouting Pile Core Stone Body in Collapsible Loess Areas

ZHOU Mingru^1,2, LI Ning¹, ZHONG Lin¹, LI Shaofei¹

1. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
2. Western Civil Engineering Disaster Pervention and Mitigation Engineering Research Center, Lanzhou 730050, China

Received:2020-11-15 Revised:2021-01-24 Online:2021-04-15 Published:2021-05-11

摘要/Abstract

摘要： 为研究湿陷性黄土地区劈裂注浆桩芯结石体力学性能,通过配置五种不同配合比的注浆浆液,对其标准养护试块、同条件养护试块以及桩芯结石体分别进行龄期为3 d、7 d、14 d、28 d、56 d、90 d的抗压强度测试。结果表明:桩芯结石体的抗压强度随水胶比的增大而降低,随养护龄期的增加而呈对数增大;注浆浆液的析水率对桩芯结石体的抗压强度影响较大,黄土的密度、含水率以及桩芯结石体在黄土中的埋置深度对其抗压强度影响较小。通过影响因素分析,推出桩芯结石体抗压强度与同浆液3 d标准养护试块抗压强度的相关关系,此关系式可对湿陷性黄土地区地基加固工程的效果进行预估,为湿陷性黄土地区地基加固工程提供了桩芯结石体抗压强度的参考。

关键词: 湿陷性黄土, 劈裂注浆, 桩芯结石体, 抗压强度, 相关关系, 地基加固

Abstract: In order to study the mechanical properties of the split grouting pile core stone body in the collapsible loess areas, five different grouting grouts with different mix ratios were carried out to test the compressive strength of test blocks of standard maintenance, test blocks of same conditions and pile core stone body of 3 d, 7 d, 14 d, 28 d, 56 d, 90 d. The results show that the compressive strength of the pile core stone body decreases with the increase of the water-binder ratio, and increases logarithmically with the increase of the curing age. The water separation rate of the grouting slurry has a greater impact on the compressive strength of the pile core stone body. The density and moisture content of the loess and the depth of the pile core stone body in the loess have a slight influence on its compressive strength. Based on the influencing factors, correlation of compressive strength between the pile core stone body and the same grout 3 d standard curing test block is derived, which predicts the effect of the foundation reinforcement project in the collapsible loess area, and provides a reference for the compressive strength of the pile core stone body for the foundation reinforcement project in the collapsible loess area.

Key words: collapsible loess, split grouting, pile core stone body, compressive strength, correlation, foundation reinforcement

中图分类号:

TU444

周茗如, 李宁, 钟琳, 李少飞. 湿陷性黄土地区劈裂注浆桩芯结石体强度试验研究[J]. 硅酸盐通报, 2021, 40(4): 1147-1153.

ZHOU Mingru, LI Ning, ZHONG Lin, LI Shaofei. Experimental Study on Strength of Split Grouting Pile Core Stone Body in Collapsible Loess Areas[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1147-1153.

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