玄武岩纤维活性粉末混凝土与钢绞线粘结滑移过程声学特性表征

doi:10.13229/j.cnki.jdxbgxb.20230081

吉林大学学报(工学版) ›› 2023, Vol. 53 ›› Issue (6): 1819-1832.doi: 10.13229/j.cnki.jdxbgxb.20230081

• 交通运输工程·土木工程 • 上一篇

玄武岩纤维活性粉末混凝土与钢绞线粘结滑移过程声学特性表征

宫亚峰¹(),吴树正¹,毕海鹏¹(),周冬明²,谭国金¹,黄晓明³

^1.吉林大学交通学院，长春 130022
^2.广西壮族自治区玉林公路发展中心，广西玉林 537002
^3.东南大学交通学院，南京 210018

收稿日期:2023-01-30 出版日期:2023-06-01 发布日期:2023-07-23
通讯作者: 毕海鹏 E-mail:gongyf@jlu.edu.cn;bihp@jlu.edu.cn
作者简介:宫亚峰（1977-），男，教授，博士.研究方向：桥梁结构健康监测理论及应用.E-mail：gongyf@jlu.edu.cn
基金资助:
国家重点研发计划项目(2021YFB2600604);吉林省交通运输科技项目(2021-1-1);黑龙江交通运输厅重点项目(2022-1);吉林省科技发展计划项目(20230402048GH);吉林省教育厅科研项目(JJKH20211113KJ);广西玉林市科学研究与技术开发计划项目(202235115)

Acoustic characterization of bond⁃slip process between basalt fiber reactive powder concrete and steel strand

Ya-feng GONG¹(),Shu-zheng WU¹,Hai-peng BI¹(),Dong-ming ZHOU²,Guo-jin TAN¹,Xiao-ming HUANG³

^1.College of Transportation，Jilin University，Changchun 130022，China
^2.Yulin Highway Development Center of Guangxi Zhuang Autonomous Region，Yulin 537002，China
^3.School of Transportation，Southeast University，Nanjing 210018，China

Received:2023-01-30 Online:2023-06-01 Published:2023-07-23
Contact: Hai-peng BI E-mail:gongyf@jlu.edu.cn;bihp@jlu.edu.cn

摘要/Abstract

摘要：

针对预应力锚索因粘结失效而导致的高边坡失稳问题，提出将预应力锚索与高性能材料结合应用的方法以提高边坡抗灾韧性。首先，开展了预应力钢绞线与玄武岩纤维活性粉末混凝土（BFRPC）中心拉拔试验，研究了公称直径为15.2 mm的钢绞线在两种浆体材料（BFRPC、M40普通水泥砂浆）下的钢绞线粘结性能，总结其破坏形式；其次，基于声发射特征参数的分布规律，识别应力状态下钢筋混凝土材料的损伤过程；再次，通过对上升时间/振幅-平均频率（RA-AF）值进行对比，明确钢绞线-混凝土拉拔过程中的损伤模式；最后，依据Ib值识别不同应力状态下钢绞线混凝土材料裂纹发展的各个阶段。研究结果表明：3个阶段的能量、幅值变化规律与试件内部裂纹的产生、扩展等损伤过程联系紧密；通过RA-AF分析得出，剪切裂纹主要发生在界面混凝土附近，而拉伸裂纹的宏观体现为垂直于加载方向上的裂纹；Ib值波动差至0.25时可以将其视为一个预警值，以警告预应力钢绞线-混凝土材料即将发生劈裂破坏。

关键词: 岩土工程, 玄武岩纤维活性粉末混凝土, 声发射, 粘结滑移, 损伤模式分析

Abstract:

To address the problem of high slope instability due to bonding failure of prestressed anchor cables， the application of prestressed anchor cables in combination with high performance materials was proposed to improve slope resilience. Firstly， the pull-out tests of prestressed steel strands and Basalt Fiber Reactive Powder Concrete （BFRPC） were carried out in the laboratory. The bonding properties of steel strands with a nominal diameter of 15.2 mm under two slurry materials （BFRPC， M40 ordinary cement mortar） were studied， and the failure modes were summarized. Then， based on the distribution law of characteristic parameters， the damage process of reinforced concrete materials under stress state was identified. Secondly， by comparing the RA-AF values， the damage mode of steel strand-concrete during drawing process was clarified. Finally， according to the Ib-value， the stages of crack development of steel strand concrete under different stress states were identified. The results show that： the energy and amplitude law of the three stages are closely related to the damage process such as the generation and expansion of cracks inside the specimen. Through RA-AF analysis， it is concluded that shear cracks mainly occur near the interface concrete， while the macroscopic manifestation of tensile cracks is cracks perpendicular to the loading direction. When the fluctuation difference of Ib-value reaches 0.25， it can be regarded as an early warning value to warn that the prestressed steel strand-concrete material is about to split.

Key words: geotechnical engineering, basalt fiber reactive powder concrete（BFRPC）, acoustic emission, bond-slip, damage analysis

中图分类号:

U417.1

宫亚峰,吴树正,毕海鹏,周冬明,谭国金,黄晓明. 玄武岩纤维活性粉末混凝土与钢绞线粘结滑移过程声学特性表征[J]. 吉林大学学报(工学版), 2023, 53(6): 1819-1832.

Ya-feng GONG,Shu-zheng WU,Hai-peng BI,Dong-ming ZHOU,Guo-jin TAN,Xiao-ming HUANG. Acoustic characterization of bond⁃slip process between basalt fiber reactive powder concrete and steel strand[J]. Journal of Jilin University(Engineering and Technology Edition), 2023, 53(6): 1819-1832.

图/表 14

图1

图2

图3

表1

图4

图5

表2

各试件粘结强度统计"

试件编号	破坏形式	极限荷载/kN	临界粘结应力 $τ c r$ /MPa	极限粘结应力 $τ u$ /MPa
BFRPC-1-1	拔出	65.29	10.79	15.58
BFRPC-1-1	拔出	62.59	10.21	14.93
BFRPC-1-3	拔出	59.32	10.15	14.15
BFRPC-2-1	拔出	58.23	10.96	13.89
BFRPC-2-3	拔出	57.96	9.26	13.83
BFRPC-2-3	拔出	59.20	9.85	14.12
BFRPC-3-1	拔出	61.22	10.61	14.60
BFRPC-3-1	拔出	62.73	10.64	14.96
BFRPC-3-1	拔出	60.58	10.12	14.45
OCM-1-1	拔出	44.30	7.61	10.57
OCM-1-2	拔出	46.52	7.82	11.10
OCM-1-3	拔出	42.03	6.95	10.03
OCM-2-1	劈裂	44.43	7.95	10.60
OCM-2-2	拔出	45.28	7.10	10.80
OCM-2-3	拔出	41.06	6.88	9.80
OCM-3-1	拔出	45.61	7.70	10.88
OCM-3-2	拔出	45.28	7.62	10.80
OCM-3-3	拔出	44.91	7.31	10.71

表2

图6

图7

图8

图9

图10

图11

图12

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玄武岩纤维活性粉末混凝土与钢绞线粘结滑移过程声学特性表征

Acoustic characterization of bond⁃slip process between basalt fiber reactive powder concrete and steel strand

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试件编号	d/mm	浆体类型	锚固长度l/mm	数量
BFRPC-1	15.2	BFRPC	100	3
BFRPC-2	15.2	BFRPC	100	3
BFRPC-3	15.2	BFRPC	100	3
OCM-1	15.2	OCM	100	3
OCM-2	15.2	OCM	100	3
OCM-3	15.2	OCM	100	3