岩石试件裂纹扩展规律及区域损伤特征分析

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL
Liu Yangyang, Xue Yadong, Shichuan Zhang, F. Jing, Du Guobin, Sukai Lu, Guangsheng Fu
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引用次数: 2

摘要

为了研究多缺陷岩石中裂纹的演化机制,采用条形贯通裂纹和空腔群等多缺陷类岩石试样,研究不同倾角下裂纹扩展规律以及空腔群的声发射和应变变化。试验结果表明,增大空腔群倾角有利于岩石的初始损伤程度,减弱裂纹起裂应力;初始裂纹起裂方向约为90°,延伸角约为75~90°;因此,裂纹发展与空腔群萌生之间的关系得到加强。具体表现为:起裂角为30°时,空腔群内空腔间裂纹沿外荷载平行方向相对独立发展;当夹角为75°时,空腔组内各空腔之间的裂纹能够相互贯通,在剪切机制破裂的作用下,沿空腔组的倾斜方向发生滑移。随着腔群倾角的增大,峰值应力处声发射能量波动频率增大,应力下降明显。空腔群倾角越大,能量积累越明显,岩石破坏越严重;当腔群角度为30°或75°时,条形贯通破裂面下方局部区域的峰值应变约为45°和60°时的3倍,说明在该角度下,应变片监测的局部区域容易产生裂纹,裂纹的进一步发展削弱了岩石的强度,从而增加了重大工程质量破坏的概率。研究成果对隧道、防空洞等具有天然和人工缺陷的围岩地下工程的危害防治具有重要的参考价值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of the crack propagation rules and regional damage characteristics of rock specimens
To study the evolution mechanism of cracks in rocks with multiple defects, rock-like samples with multiple defects, such as strip-shaped through-going cracks and cavity groups, are used, and the crack propagation law and changes in AE (acoustic emission) and strain of cavity groups under different inclination angles are studied. According to the test results, an increase in the cavity group inclination angle can facilitate the initial damage degree of the rock and weaken the crack initiation stress; the initial crack initiation direction is approximately 90°, and the extension angle is approximately 75~90° from the strip-shaped through-going cracks; thus, the relationship between crack development and cavity group initiation strengthens. The specific performance is as follows: when the initiation angle is 30°, the cracks between the cavities in the cavity group develop relatively independently along the parallel direction of the external load; when the angle is 75°, the cracks between the cavities in the cavity group can interpenetrate, and slip can occur along the inclination of the cavity group under the action of the shear mechanism rupture. With the increase in the inclination angle of the cavity group, the AE energy fluctuation frequency at the peak stress increases, and the stress drop is obvious. The larger the cavity group inclination angle is, the more obvious the energy accumulation and the more severe the rock damage; when the cavity group angle is 30° or 75°, the peak strain of the local area below the strip-shaped through-going fracture plane is approximately three times that when the cavity group angle is 45° and 60°, indicating that cracks are easily generated in the local area monitored by the strain gauge at this angle, and the further development of the cracks weakens the strength of the rock, thereby increasing the probability of major engineering quality damage. The research results will have important reference value for hazard prevention in underground engineering projects through rock with natural and artificial defects, including tunnels and air-raid shelters.
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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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