基于表面扫描的纤维增强喷射混凝土-花岗岩界面剪切破坏特性研究

IF 6.5 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Zhongjing Hu , Qingbiao Wang , Yiming Ma , Hao Lv , Weizhen Liu , Ran Yan , Keyong Wang , Tangsha Shao , Yong Sun
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引用次数: 0

摘要

在岩土工程建设中,混凝土-岩石界面的剪切特性对工程结构的稳定性起着至关重要的作用。本研究结合三维扫描和雕刻技术,制作了纤维增强喷射混凝土-花岗岩组合试样。在不同的法向应力条件下,对具有不同界面粗糙度的试样进行了直接剪切测试。提出了一种利用 XTOM 工业光学表面扫描系统分析花岗岩界面剪切破坏特征的方法。此外,还介绍了一种用于估算纤维增强混凝土-岩石复合试样界面峰值剪切强度的增强公式。研究结果表明(1) 纤维喷射混凝土-花岗岩界面的剪切强度会因法向应力而显著增加。具体而言,在接缝粗糙度系数(JRC)为 2.0 的条件下,法向应力为 2.0 兆帕时的剪切强度比 0.5 兆帕时高出 185.89 %。(2) 介绍了一种利用表面扫描技术分析粗糙界面损伤特征的方法。利用表面扫描技术,可重建损伤前后的粗糙表面,从而提取二维粗糙度曲线,有效捕捉法向应力和粗糙度对界面剪切破坏特性的影响。(3) 根据观察到的宏观和微观破坏特征,以及剪切后界面的扫描电子显微镜(SEM)形态,可以明显看出剪切破坏主要发生在纤维增强混凝土的一侧。此外,研究还发现,混凝土一侧的破坏程度随粗糙度和法向应力水平的提高而增加,而界面剪切强度则因抗碱性玻璃纤维(ARGF)的存在而提高。 (4) 改进了混凝土-岩石界面剪切强度的计算公式,并通过实验验证了其准确性。研究成果可为纤维增强混凝土-岩石界面剪切特性研究和岩土工程建设提供数据基础和理论支持。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study on shear failure characteristics of fiber-reinforced shotcrete-granite interface based on surface scanning

The shear characteristics of the concrete-rock interface play a crucial role in the stability of engineering structures in geotechnical construction. This study utilized a combination of three-dimensional scanning and sculpting techniques to create fiber-reinforced shotcrete-granite combination specimens. Specimens with varying interface roughness were tested in direct shear under different normal stress conditions. A method for analyzing the shear failure characteristics of granite interfaces using the XTOM industrial optical surface scanning system is proposed. Furthermore, an enhanced formula for estimating the peak shear strength of the interface in fiber-reinforced concrete-rock composite specimens is introduced. The research findings suggest the following: (1) The shear strength of the fiber shotcrete-granite interface is significantly increased by normal stress. Specifically, under joint roughness coefficient (JRC) 2.0 conditions, the shear strength at a normal stress of 2.0 MPa is 185.89 % higher than at 0.5 MPa. (2) A method for analyzing the damage characteristics of rough interfaces using surface scanning technology is introduced. Utilizing surface scanning technology, the rough surface is reconstructed both before and after damage, allowing for the extraction of a two-dimensional roughness curve that effectively captures the influence of normal stress and roughness on interface shear failure characteristics. (3) Based on the observed macroscopic and microscopic damage characteristics, as well as the scanning electron microscope (SEM) morphology of the interface after shearing, it is evident that shearing damage predominantly occurs on the side of the fiber-reinforced concrete. Furthermore, it was found that the degree of damage on the concrete side increases with higher roughness and normal stress levels, while the interface shear strength is enhanced by the presence of alkali-resistant glass fiber (ARGF). (4) The calculation formula of concrete-rock interface shear strength was improved, and its accuracy was verified through experiments. The research findings can serve as a data foundation and theoretical support for studying the shear characteristics of fiber-reinforced concrete-rock interfaces and geotechnical engineering construction.

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来源期刊
CiteScore
7.60
自引率
19.40%
发文量
842
审稿时长
63 days
期刊介绍: Case Studies in Construction Materials provides a forum for the rapid publication of short, structured Case Studies on construction materials. In addition, the journal also publishes related Short Communications, Full length research article and Comprehensive review papers (by invitation). The journal will provide an essential compendium of case studies for practicing engineers, designers, researchers and other practitioners who are interested in all aspects construction materials. The journal will publish new and novel case studies, but will also provide a forum for the publication of high quality descriptions of classic construction material problems and solutions.
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