Dynamic tensile fracture of fissured sandstone: Fissure angle dependence

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-09-13 DOI:10.1016/j.tafmec.2025.105241

Jinwen Bai , Shuquan Sun , Xudong Shi , Guorui Feng , Jun Guo , Shanyong Wang , Xinyu Yang , Kai Wang

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Abstract

The dynamic tensile behavior of fissured rock masses critically influences the stability assessment of rock engineering structures under dynamic loading. In this study, dynamic Brazilian splitting tests were carried out on sandstone disc specimens with different prefabricated fissure angles using Split Hopkinson Pressure Bar (SHPB). Macroscopic damage characteristics—including dynamic tensile strength, energy dissipation patterns, and strain concentration—were quantitatively analyzed. Complementary PFC-FLAC coupled simulations revealed microscopic damage evolution through destructive processes and contact force distributions. Based on this, the effect of fissure angle on the damage mechanism was investigated. The results showed that dynamic peak load and reflected energy followed a concave trend with increasing fissure angle, while dissipated and transmitted energy percentages showed inverse correlations. The Strain concentration propagated along fissure direction and end-to-tip paths. Crack initiation consistently occurred at the incident bar contact point and nearest fissure tip. Damage severity followed parabolic evolution with fissure angles. The fissure angle not only had an effect on the stress extension path of the specimen during loading, but also controlled the stress redistribution of the specimen after loading. As the fissure angle increased, the crack changed from a direct tensile crack to a tensile shear crack.

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裂隙砂岩的动态拉伸断裂：裂隙角依赖性

裂隙岩体的动态拉伸特性对动荷载作用下岩体工程结构的稳定性评价具有重要影响。采用劈裂霍普金森压杆（Split Hopkinson Pressure Bar， SHPB）对不同预制裂隙角度的砂岩盘状试件进行了动态巴西劈裂试验。宏观损伤特征——包括动态抗拉强度、能量耗散模式和应变浓度——进行了定量分析。互补的PFC-FLAC耦合模拟揭示了微观损伤通过破坏过程和接触力分布的演化。在此基础上，研究了裂纹角度对损伤机理的影响。结果表明：随着裂隙角度的增大，动态峰值荷载与反射能呈凹形变化，耗散能与透射能呈负相关；应变集中沿裂隙方向和端尖路径扩展。裂纹起裂始终发生在入射杆接触点和最近的裂纹尖端。损伤程度随裂缝角度呈抛物线演化。裂隙角度不仅影响加载过程中试件的应力扩展路径，而且控制加载后试件的应力重新分布。随着裂纹角度的增大，裂纹由直接拉伸裂纹转变为拉伸剪切裂纹。

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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.