环氧注浆界面粘结强度对裂隙砂岩临界加载角及I-II混合模式断裂行为的影响

IF 5.3 2区 工程技术 Q1 MECHANICS
Guiquan Liu , Guoqing Chen , Qingbo Hu , Xing Zhu , Tao Wen , Nan Jiang
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引用次数: 0

摘要

了解注浆裂隙岩体的断裂行为对提高结构稳定性和裂缝控制具有重要意义。研究了环氧树脂灌浆裂隙砂岩的I-II型混合模式断裂行为,重点研究了灌浆强度和加载角度的影响。建立了一个理论模型,称为临界加载角模型(C-LAM),用于预测纯II型断裂的临界加载角(βc),并考虑了浆料-岩石界面粘聚。采用不同配合比的环氧灌浆对中心开裂巴西盘试件进行了巴西劈裂试验。利用声发射和数字图像相关技术监测裂缝过程。结果表明,界面结合强度和裂纹倾角共同调节内部应力场,并共同影响断裂行为。高强度注浆增强了界面的凝聚力,形成了一个加固区,使主裂缝绕过注浆区。相比之下,低强度灌浆导致塑性为主的破坏,其裂缝形态与未灌浆试件相似。裂缝倾角进一步影响裂缝响应,根据加载角度的不同,主裂缝可以绕过或穿透浆液。C-LAM模型预测βc随界面内聚力的增加呈非线性下降,表明两者呈负相关关系。基于内部和外部监测数据的裂缝类型分类验证了模型的预测能力。这些发现阐明了注浆改变断裂模式转变的机制,并为加筋岩石系统II型破坏提供了预测框架。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of epoxy grouting-induced interfacial bond strength on the critical loading angle and mixed-mode I-II fracture behavior of fractured sandstone
Understanding the fracture behavior of grouted fractured rock masses is critical for enhancing structural stability and fracture control. This study investigates the mixed-mode I–II fracture behavior of fractured sandstone grouted with epoxy resin, focusing on the effects of grout strength and loading angle. A theoretical model—termed the Critical Loading Angle Model (C-LAM)—was developed to predict the critical loading angle (βc) for pure Mode II fracture, incorporating grout–rock interfacial cohesion. Brazilian splitting tests were conducted on center-cracked Brazilian disc (CCBD) specimens grouted with epoxy grout at varying mix proportions. Fracture processes were monitored using acoustic emission and digital image correlation techniques. The results show that both interfacial bond strength and crack inclination modulate the internal stress field and jointly influence the fracture behavior. High-strength grout enhanced interfacial cohesion, forming a reinforced zone that redirected the main crack to bypass the grouted region. In contrast, low-strength grout led to plastic-dominated failure, with crack morphology resembling that of ungrouted specimens. Crack inclination further affected fracture response, with the main crack either bypassing or penetrating the grout depending on the loading angle. The C-LAM model predicts a nonlinear decrease in βc with increasing interfacial cohesion, indicating an inverse correlation. Crack-type classification based on internal and external monitoring data validated the model’s predictive capability. These findings elucidate the mechanism by which grouting modifies fracture mode transitions and provide a predictive framework for Mode II failure in reinforced rock systems.
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来源期刊
CiteScore
8.70
自引率
13.00%
发文量
606
审稿时长
74 days
期刊介绍: EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.
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