Experimental study on the fracture characteristics of pre-holed limestone in the karst region under uniaxial cyclic compression

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-09-02 DOI:10.1016/j.tafmec.2025.105216

Guoshao Su , Yanken Gan , Youneng Liu , Xiaoming Liu , Yong Zhang

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Abstract

In the present study, static and cyclic uniaxial compression tests were conducted on limestone specimens containing 1, 2 and 6 holes (dimensions: 200 mm (height) × 100 mm (width) × 30 mm (thickness)). The relationships between stress–strain responses, acoustic emission (AE) signals, surface displacement fields, and crack evolution processes were analyzed using combined monitoring techniques containing AE and digital image correlation (DIC). Particle flow code (PFC2D) was employed to simulate the crack propagation behavior of pre-drilled limestone specimens. The results show that four typical crack types were observed in the pre-holed limestone, including tensile mode, mixed tensile and shear mode with equal contributions, and tensile or shear dominant mixed modes. Under cyclic loading, pre-holed limestone exhibited shear-dominated mixed failure, contrasting by the tensile-dominated pattern under static loading. This failure pattern was accompanied by a broadened dominant frequency band of AE signals and significantly amplified low and medium frequency components. Concurrently, net-scattered force chains in the compressive zones and diagonal (45°/135°) tensile-compressive zones near holes triggered structural damage, initiating secondary cracks and remote shear cracks. These findings provide insights into the dynamic fracture mechanisms of limestone with hole defects under cyclic loading, which are crucial for engineering applications in rockfall prevention.

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岩溶区预孔灰岩单轴循环压缩破裂特性试验研究

本研究对含1、2、6孔的石灰石试件（尺寸：200 mm（高）× 100 mm（宽）× 30 mm（厚））进行静态和循环单轴压缩试验。采用声发射（AE）和数字图像相关（DIC）相结合的监测技术，分析了应力应变响应、声发射（AE）信号、地表位移场和裂纹演化过程之间的关系。采用颗粒流程序（PFC2D）模拟了预钻孔灰岩试件的裂纹扩展行为。结果表明：预孔灰岩中存在4种典型的裂缝类型，分别为拉伸模式、拉剪混合模式和拉剪混合模式。预孔灰岩在循环荷载作用下表现为剪切为主的混合破坏模式，而在静荷载作用下则表现为拉伸为主的混合破坏模式。这种失效模式伴随着声发射信号的主导频段变宽，低频和中频成分显著放大。同时，压缩区和孔附近斜向（45°/135°）拉压区净分散力链触发结构破坏，引发次生裂缝和远端剪切裂缝。这些发现为研究含孔缺陷石灰岩在循环荷载作用下的动态断裂机制提供了新的思路，对岩崩防治工程应用具有重要意义。

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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.