Mechanical mechanism of control holes in guiding the directional propagation of blast-induced cracks under in-situ stress conditions

IF 5.3 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics Pub Date : 2025-09-07 DOI:10.1016/j.engfracmech.2025.111536

Minghua Lin , Wei Yang , Ting Liu , Baiquan Lin , Tong Liu , Yang Shen , Xiangliang Zhang , Shiqi Liu

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引用次数: 0

Abstract

The rational design of control holes is crucial for achieving directional propagation of blast-induced cracks. Previous studies have overlooked the influence of the secondary stress field around the control holes on crack propagation. To address this issue, this study investigates the mechanical control mechanism by which control holes guide blast-induced cracks under in-situ stress conditions. Experimental results reveal that the guiding effect depends on the orientation of the in-situ stress conditions. Improper arrangement of control holes may lead to a secondary compressive stress field around them, which can inhibit crack propagation. Numerical simulations further show that when control holes are arranged in groups and the line connecting the blast hole and the control holes forms a 45° angle with the maximum and minimum principal stresses, the blast-induced cracks can effectively connect the control holes, achieving directional propagation.

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地应力条件下控制孔引导爆破裂纹定向扩展的力学机理

控制孔的合理设计是实现爆生裂纹定向扩展的关键。以往的研究忽略了控制孔周围二次应力场对裂纹扩展的影响。为了解决这一问题，本文研究了地应力条件下控制孔引导爆破裂缝的力学控制机制。实验结果表明，导向效果与地应力条件的取向有关。控制孔布置不当会在控制孔周围形成二次压应力场，从而抑制裂纹扩展。数值模拟进一步表明，当控制孔成组布置，爆破孔与控制孔的连线以最大、最小主应力为45°夹角时，爆生裂纹能有效连接控制孔，实现定向传播。

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

Engineering Fracture Mechanics 物理-力学

CiteScore

8.70

自引率

13.00%

发文量

606

审稿时长

74 days

期刊介绍： EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.