单轴压缩条件下含圆孔的各向异性页岩的声发射特征和裂纹机理分析

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2024-11-19 DOI:10.1016/j.tafmec.2024.104771

Xianhui Feng , Huilin Liu , Xu Chen , Weiche Chang , Kaizong Xia , Qifeng Guo , Liyuan Liu , Mingjie Li

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引用次数: 0

摘要

页岩是自然界广泛存在的一种层状沉积岩。在边坡工程、隧道工程、页岩气工程等实际工程中，层状结构和走向会导致结构强度降低，易引发安全事故。本研究通过不同基底角的单轴压缩试验，研究了含圆孔页岩样品的声发射（AE）特性和断裂模式。实验结果表明，样品的断裂模式不仅受到垫层倾角的影响，还受到孔洞造成的应力集中的影响。不同的断裂模式会导致 AE 特性的差异，如环数、b 值、能量和峰值频率。与剪切破坏相比，拉伸破坏的 AE 累积次数和峰值频率更高，b 值的变化频率也更高。此外，根据页岩样品的 RA-AF 分布特征，确定 AF = 10RA + 21 为不同裂纹类型的分界线，其分界结果与宏观裂纹的分界结果一致。根据该分界线分析了裂纹的演变过程，发现拉伸裂纹和剪切裂纹分别集中在应力峰值阶段和裂纹稳定增长阶段。页岩的 AE 特性研究将为指导相关工程实践提供实验依据和参考。

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Acoustic emission characteristics and cracking mechanism analysis of anisotropic shale containing a circular hole under uniaxial compression

Shale is a kind of layered sedimentary rock widely existing in nature. In slope engineering, tunnel engineering, shale gas engineering and other practical engineering, layer structure and orientation will lead to the structural strength reduction, easy to cause safety accidents. In this study, the acoustic emission (AE) characteristics and fracture modes of shale samples containing a circular hole were investigated by uniaxial compression tests with different bedding angles. The experimental results revealed that the fracture modes of the sample are affected not only by the dip angle of bedding, but also by the stress concentration caused by the hole. Different fracture modes lead to differences in AE characteristics such as ring number, b-value, energy and peak frequency. Compared with shear failure, the cumulative AE count and peak frequency of tensile failure are higher, and the change frequency of the b-value is higher. Additionally, according to the RA-AF distribution characteristics of the shale samples, AF = 10RA + 21 was confirmed as the dividing line of different crack types, and the dividing result was consistent with that of macroscopic cracks. According to this dividing line, the crack evolution process was analyzed, and it was found that the tensile cracks and shear cracks were concentrated in the peak stress and phase of crack steady growth respectively. The study of AE characteristics of shale will provide experimental basis and reference for guiding related engineering practice.

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.