单轴加载下不同开孔数脆性岩石的断裂响应及机制

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL
Hao Wu, D. Ma, A. Spearing, G. Zhao
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引用次数: 33

摘要

深埋硬岩隧道中经常发生冲击地压、板裂破坏等危险破坏现象,因此了解隧道应力状态的破坏现象和破坏机制至关重要。在本研究中,将岩体中的隧道系统物理模拟为岩石试样中的若干尺度开口,并系统地研究了具有1至4个马蹄形开口的岩石试样在单轴压缩下的力学行为。试验过程中,采用数字图像相关(DIC)和声发射(AE)技术对试件的断裂响应进行监测。然后对试件的应力分布进行了数值分析,并计算了开口周边的应力集中系数。结果表明,开孔数量对岩石力学性能的弱化效果有显著影响。开孔试样的渐进开裂过程由第一次拉伸裂纹→第二次拉伸裂纹→剥落裂纹→剪切裂纹,并测量了裂纹阈值应力。形成剪切破坏和剪切-拉伸破坏两种破坏模式。根据开口周围的应力分布规律,可以充分解释裂纹的起裂机理。本研究对硬岩隧道的破坏机制提供了新的认识。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fracture response and mechanisms of brittle rock with different numbers of openings under uniaxial loading
Hazardous failure phenomena such as rock bursts and slabbing failure frequently occur in deep hardrock tunnels, thus understanding the failure phenomena and mechanisms of the stress regime on tunnels is extremely critical. In this study, the tunnel system in a rock mass was physically modelled as a number of scaled openings in rock specimens, and the mechanical behavior of specimens having one to four horseshoe-shaped openings under uniaxial compression were investigated systematically. During the tests, the digital image correlation (DIC) and acoustic emission (AE) techniques were jointly employed to monitor the fracture response of specimens. After which, the stress distributions in the specimens were numerically analyzed and the stress concentration factor on the periphery of the opening was calculated. The results show that the number of openings have a significant impact on the weakening effect of rock mechanical properties. The progressive cracking process of the specimens with openings evolves from first-tensile cracks through second-tensile cracks and spalling cracks to shear cracks, and the crack threshold stresses are measured. Two failure modes are formed: shear failure and shear-tensile failure. According to the stress distribution law around the opening, the crack initiation mechanism can be fully explained. This research provides an insight to failure mechanism of hardrock tunnel.
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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