Experimental investigations on the failure characteristics of the slit-contained circular opening under biaxial compression: Insights into the rockburst prevention

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2024-09-30 DOI:10.1016/j.tafmec.2024.104701

Jian-Zhi Zhang , Yi-Jie Zhou , Cheng-Yu Liu , Jin Yu , Xing-Shang Li , Ting Zhang

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引用次数: 0

Abstract

The slit-cut method for the rockburst prevention and control is believed effective with its easiness in operation, adjustment and compatibility. However, there is limited advance knowledge of the physics of the slit-cut method, which is vital for the engineering designs. In this study, the biaxial compression tests with a synchronous AE (acoustic emission)-DIC (digital image correlation) monitoring are creatively carried out on the slit-contained circular opening specimens with different slit configurations to demonstrate the academic thoughts and mechanisms of the slit-cut method. The experiments document the two typical failure types namely the internal crack propagation and the dynamic rockburst, which occupy different AE hit rate characteristics and different entropy properties. With the occurrence of rockburst, the AE hit rate presents a bouncing ascend-descend trend, and a higher disorder and chaos is faithfully exhibited. Depending on the slit parameters, the slit-cut method can efficiently mitigate rockburst in terms of the occurrence frequency and magnitude. The underlying mechanism lies in the enhancement of the shear mechanism and the development of the internal cracks through which the stored energy can be greatly dissipated. However, due to the unrestricted shear failure in the slit-contained opening specimens, the opening-scale inward instability can be triggered by the internal crack coalescence, thus posing a threat to the safety of the opening. Implementing the slit-cut method with a consideration of the in-situ stress conditions is evidently essential for the safe excavation.

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双轴压缩条件下狭缝式圆形开口破坏特征的实验研究：对防止岩爆的启示

用于岩爆预防和控制的切缝法以其操作简便、易于调整和兼容性而被认为是有效的。然而，人们对狭缝切割法的物理知识了解有限，而这对工程设计至关重要。在本研究中，创造性地对不同狭缝结构的含狭缝圆形开口试样进行了同步 AE（声发射）-DIC（数字图像相关）监测的双轴压缩试验，以展示狭缝切割法的学术思想和机理。实验记录了两种典型的破坏类型，即内部裂纹扩展和动态岩爆，它们具有不同的 AE 射率特征和不同的熵特性。随着岩爆的发生，AE 射线命中率呈现出上升-下降的反弹趋势，并忠实地表现出较高的无序性和混沌性。根据狭缝参数的不同，狭缝切割法可以有效地降低岩爆发生的频率和幅度。其根本机理在于剪切机制的增强和内部裂缝的发展，通过内部裂缝可以极大地消散储存的能量。然而，由于包含狭缝的开口试件存在无限制的剪切破坏，内部裂缝的凝聚会引发开口尺度向内的不稳定性，从而对开口的安全性构成威胁。显然，采用考虑原位应力条件的狭缝切割法对安全开挖至关重要。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.