硅酸盐学报

基于数字图像和超声技术的钢纤维混凝土劈裂损伤过程及规律

PDF下载

覃源 ¹ , 赵世龙 ¹ , 周恒 ² , 赵靖伟 ¹^,² , 吴江江 ¹^,³

硅酸盐学报 | 研究论文 2025,53(8): 2287-2300

收起

硅酸盐学报 |研究论文 2025 , 53 (8) : 2287 -2300

基于数字图像和超声技术的钢纤维混凝土劈裂损伤过程及规律

全屏

覃源¹, 赵世龙¹, 周恒², 赵靖伟¹^,², 吴江江¹^,³

作者信息

^1．西安理工大学，省部共建西北旱区生态水利国家重点实验室，西安 710048

^2．中国电建集团西北勘测设计研究院有限公司，西安 710065

^3．中国能源建设集团西北建设投资有限公司，西安 710048

作者简介:

覃源（1983—），男，博士，教授。

Splitting Damage Process and Law of Steel Fiber Reinforced Concrete Based on Digital Image and Ultrasonic Technology

Yuan QIN¹, Shilong ZHAO¹, Heng ZHOU², Jingwei ZHAO¹^,², Jiangjiang WU¹^,³

Affiliations

^1.State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an 710048, China

^2.Power China Northwest of Engineering Corporation Limited, Xi'an 710065, China

^3.China Energy Construction Group Northwest Construction Investment Co., Ltd., Xi'an 710048, China

QIN Yuan (1983-), male, Ph.D., Professor. E-mail: qinyuan@xaut.edu.cn

出版时间: 2025-08-20 doi: 10.14062/j.issn.0454-5648.20240762

文章导航

摘要

收起

鉴于钢纤维混凝土衬砌（SFRC）在隧道等深基坑工程方面的应用价值，为探究钢纤维混凝土的断裂过程，以钢纤维和硅灰为控制变量，共设计9组正交配合比试件进行劈裂力学试验，采用数字图像相关技术（DIC）对试件在加载中的裂缝演化机制进行分析，同时利用超声波技术（UT）捕捉试件劈裂损伤过程中的声学特征变化。结果表明：SFRC具有较强的裂后承载能力，钢纤维掺量45 kg/m³，硅灰掺量6%，储能水平最高且劈裂强度可提高81.82%；钢纤维对胶凝材料的补强作用主要表现在线弹性阶段，90%峰值应力之后钢纤维的阻裂作用逐渐增强，裂缝主要以纵向微裂缝扩展，应力下降到70%峰值应力后，钢纤维的阻裂作用逐渐削弱，裂缝开始迅速横向扩展；此外，SFRC劈裂损伤过程中超声波速呈梯形分级衰减趋势。基于能量演化规律分析DIC与UT表征裂缝扩展具有强相关性和互补性。

关键词

钢纤维混凝土 / 劈裂 / 数字图像技术 / 超声波测试 / 裂缝演化过程

Abstract

收起

Introduction

In recent years, China's tunnel engineering has developed rapidly, and concrete lining support technology has been widely used in tunnels, underground engineering projects and deep foundation pits. However, with increasing buried depth and ground stress, ordinary concrete lining support technology often has certain limitations. It is easy to crack during service and shows obvious brittleness when destroyed, which poses a threat to the safety of tunnel engineering. Therefore, in order to prevent cracking, steel fibers with random distribution are usually mixed into concrete to achieve, and in the engineering practice of tunnel lining detection, engineers urgently seek to use high-precision non-destructive testing methods to detect the health status of concrete lining. Therefore, two non-destructive testing methods, Digital image correlation technology (DIC) and Ultrasonic technology (UT), are used to characterize the cracking damage process of concrete, and the strong correlation and complementarity of DIC and UT are verified based on the law of energy evolution.

Methods

The specimens were designed with steel fiber and silica fume content as the control variables, and a total of 9 groups of orthogonal mix specimens were designed for splitting mechanical tests, with a water-glue ratio of 0.43, a mass steel fiber content of 40, 45 kg/m³, and 50 kg/m³, and the mineral admixture silica fume replaced cement with the same amount according to different volume parameters (3%, 6%, 9%), and the dimensions of the 10 groups of specimens in this experiment were: 100 mm × 100 mm ×100 mm.

In accordance with CECS13-2009 Fiber Concrete Test Method Standard, the electro-hydraulic servo pressure testing machine (WAW-1000) is used in the splitting test, the maximum test load is 1000 kN for the control parameters, the stress control loading speed is 0.04 MPa/s, and the failure standard is set to 30% of the peak load. Place the steel gasket up and down at the centerline position of the specimen, and the size of the gasket is 200 mm × 5 mm × 5 mm.

Results and discussion

In this paper, by using DIC and UT, based on the energy evolution law, the crack propagation process of SFRC lining under different mix ratios is verified, and the strong correlation and complementarity between DIC and UT test results are verified. The influence of steel fiber and silica fume on fracture mechanical properties is revealed. The main conclusions are as follows:

The peak stress at 40, 45 kg/m³ and 50 kg/m³ was increased by 52.73%, 81.82% and 73.03% respectively compared with DZ, respectively, that is, the cleavage strength increased significantly when the steel fiber content was 45 kg/m³, and StF45-SF6% showed good safety reserve and ductility, and the increase of silica fume volume content at 50 kg/m³ led to a significant increase in the slope behind the peak of the stress-strain curve, which was negatively correlated with the cleavage strength.

According to the cloud map analysis of DIC, it is found that the cracking resistance of steel fiber on the main crack begins to increase after the stress reaches the 90%P_Max, and the crack mainly extends longitudinally. When the stress drops below 70%P_Max, the main fracture begins to expand laterally, and the inhibition effect of steel fiber across the fracture path gradually decreases to form macroscopic cracks. Under the same steel fiber content, the silica fume volume content was inversely proportional to the CTOD_c, that is, silica fume could provide additional viscosity and had a good hindrance effect on the expansion of CTOD.

According to the acoustic characteristics such as waveform, first wave amplitude and wave velocity, it can be divided into: no damage period, microcrack propagation period, macroscopic crack propagation period, and damage stability period. Based on the principle of energy evolution, it is verified that DIC and UT have strong correlation and complementarity, and the energy storage level of SFRC K_d increased by 12.5%~52.5% compared with DZ, and steel fiber significantly reduced the release rate of elastic strain energy.

Conclusions

The main summary of this paper is as follows: SFRC has a strong post-cracking bearing capacity, with steel fiber content of 45 kg/m³ and silica fume content of 6%, the highest energy storage level and the splitting strength can be increased by 81.82%; Based on the cloud map analysis of DIC, the bridging effect of silica fume is mainly manifested before the 90% peak stress. After 90% peak stress, the crack resistance of steel fibers is gradually enhanced, and the cracks are mainly propagated by longitudinal microcracks. After the stress drops to 70% of the peak stress, the steel fiber crack resistance is gradually weakened, and the fracture begins to expand horizontally rapidly. In addition, the ultrasonic velocity of SFRC showed a trapezoidal hierarchical attenuation trend during splitting damage. Analysis based on the energy evolution law, UT and DIC have strong correlation and complementarity in characterizing the crack propagation process.

Key words

steel fiber reinforced concrete / splitting / digital image technology / ultrasonic technology / crack evolution process

引用本文

覃源, 赵世龙, 周恒, 赵靖伟, 吴江江. 基于数字图像和超声技术的钢纤维混凝土劈裂损伤过程及规律. 硅酸盐学报, 2025 , 53 (8) : 2287 -2300 . DOI: 10.14062/j.issn.0454-5648.20240762

Yuan QIN, Shilong ZHAO, Heng ZHOU, Jingwei ZHAO, Jiangjiang WU. Splitting Damage Process and Law of Steel Fiber Reinforced Concrete Based on Digital Image and Ultrasonic Technology[J]. Journal of the Chinese Ceramic Society, 2025 , 53 (8) : 2287 -2300 . DOI: 10.14062/j.issn.0454-5648.20240762

基金

收起

国家自然科学基金项目(52079109; 52279139; 52009108)

参考文献

收起

文献

收起

参考文献引证文献

排序方式：

2025年第53卷第8期

PDF下载

引用本文

BibTeX

文章信息

doi: 10.14062/j.issn.0454-5648.20240762

接收时间：2024-11-30
首发时间：2026-10-21
出版时间：2025-08-20

补充材料

相关文章

文章信息

作者

出版历史

收稿日期：2024-11-30
修回日期：2025-02-10

基金

国家自然科学基金项目(52079109; 52279139; 52009108)

作者信息

^1．西安理工大学，省部共建西北旱区生态水利国家重点实验室，西安 710048

^2．中国电建集团西北勘测设计研究院有限公司，西安 710065

^3．中国能源建设集团西北建设投资有限公司，西安 710048

参考文献

分享链接

https://castjournals.cast.org.cn/joweb/gsyxb/CN/10.14062/j.issn.0454-5648.20240762

分享至

全文二维码

扫描看全文

引用本文

BibTeX

本文的引用情况

2种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

关闭全屏

BibTeX
EndNote
RefWorks
TxT