基于HJC模型的深部岩石爆破裂纹受不耦合系数影响的模拟研究  

Simulation of deep rock blasting cracks affected by decoupling coefficient based on HJC model

作　　者：何家辉 胡义锋 HE Jiahui;HU Yifeng(School of Civil Engineering and Architecture,Xi’an University of Technology,Xi’an 710048,China)

机构地区：[1]西安理工大学土木建筑工程学院,西安710048

出　　处：《振动与冲击》2025年第3期171-181,共11页Journal of Vibration and Shock

基　　金：国家自然科学基金(11972285);陕西省教育厅青年创新团队项目(21JP079)。

摘　　要：在深部岩石爆破开挖中,装药不耦合系数对岩石的破裂程度和损伤范围具有显著影响。基于已有试验数据标定HJC(Holmquist-Johnson-Cook)模型参数,使用有限元软件LS-DYNA引入额外的失效准则以更准确地描述模型拉伸损伤情况,并通过模拟岩石单孔爆破试验和利用经验公式验证模型的合理性;研究不耦合系数和围压与爆破裂隙区范围间的关系,分析不耦合系数变化对粉碎区和炮孔周围环向应力场动态演化过程的影响。研究结果表明:不耦合系数和围压共同决定裂纹的扩展行为,不耦合系数增加,导致环向拉应力减小,径向裂纹扩展效应减弱,而围压的提升限制了裂纹的扩展,改变了径向裂纹的扩展范围;双向等值围压下,裂隙区范围随着不耦合系数和围压的增大呈先陡后缓的缩减趋势,围压对控制裂纹范围占主导地位;构建描述不耦合系数和侧压力系数对裂隙区范围影响的关系式,认为裂纹扩展具有明显的方向性,并根据其中关系,以期能够为深部岩石爆破中实现爆破裂纹的精细化控制,优化岩石破碎效率提供参考。In deep rock blasting excavation,decoupling coefficient of charge has a significant impact on degree of rock fracture and damage range.Here,firstly,based on existing experimental data,parameters of Holmquist-Johnson-Cook(HJC)model were calibrated,and additional failure criteria were introduced with the finite element software LS-DYNA to more correctly describe tensile damage of the model,and the rationality of the model was verified by simulating single hole rock blasting experiments and using empirical formulas.Secondly,relations among decoupling coefficient,confining pressure and range of blasting crack zone were studied,and effects of decoupling coefficient variation on dynamic evolution process of circumferential stress field around crushing zone and blast hole were analyzed.The study results showed that decoupling coefficient and confining pressure jointly determine crack propagation behavior,increasing decoupling coefficient leads to decrease in circumferential tensile stress and weakening of radial crack propagation effect,while increase in confining pressure limits crack propagation and changes range of radial crack propagation;under bidirectional equivalent confining pressure,range of crack zone exhibits a decreasing trend from steep to gentle with increase in decoupling coefficient and confining pressure,and confining pressure dominates control of crack range;a relation equation is constructed to describe effects of decoupling coefficient and lateral pressure coefficient on range of fracture zones,consider crack propagation having obvious directionality,and provide a reference for realizing fine control of blasting cracks and optimizing rock fragmentation efficiency in deep rock blasting.

关 键 词：深部岩石爆破 HJC模型 不耦合系数 爆破裂纹 数值分析 

分 类 号：O346[理学—固体力学]