Dynamic response characteristics and damage calculation method of fractured rock mass under blasting disturbance

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Impact Engineering Pub Date : 2024-06-17 DOI:10.1016/j.ijimpeng.2024.105036
Xudong Jiang , Yiguo Xue , Xingtao Ren , Fanmeng Kong , Xiaomu Liao
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Abstract

The mechanical responses and damage characteristics of fractured rock masses under dynamic loads play a significant role in ensuring the safety of blasting operations. The study employs dynamic finite element method (FEM) to simulate blasting in fractured rock masses, revealing the propagation features of blasting stress waves, the evolution of effective stress and the mechanism of damage evolution around the borehole. Based on the Weibull distribution, a rock damage model was established, which yielded the stress-strain relationship and damage equation for rocks under uniaxial impact. The parameters of the damage equation were fitted through numerical SHPB tests. The results indicate that in the direction of higher initial stress, the stress wave propagates faster, and the development of damage surfaces is more pronounced. In cylindrical charge blasting, the maximum blasting stress occurs in the middle section of the borehole, with limited influence from the charge on the bottom of the hole. Within a range of approximately 2 to 3 times the borehole diameter, the surrounding rock sustains complete damage. While within a range of about 4 to 5 times the borehole diameter, the degree of damage to the surrounding rock decreases rapidly, and beyond this range, the damage to the surrounding rock gradually diminishes.

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爆破扰动下断裂岩体的动态响应特性和损伤计算方法
断裂岩体在动态载荷作用下的力学响应和损伤特征对确保爆破作业的安全性具有重要作用。本研究采用动态有限元法(FEM)模拟裂隙岩体的爆破,揭示了爆破应力波的传播特征、有效应力的演化过程以及钻孔周围的损伤演化机理。基于威布尔分布,建立了岩石损伤模型,得出了岩石在单轴冲击下的应力应变关系和损伤方程。通过数值 SHPB 试验拟合了破坏方程的参数。结果表明,在初始应力较高的方向,应力波传播速度更快,损伤面的发展也更明显。在圆柱形装药爆破中,最大爆破应力出现在钻孔中段,装药对钻孔底部的影响有限。在约为钻孔直径 2 至 3 倍的范围内,围岩会受到完全破坏。在约为钻孔直径 4 至 5 倍的范围内,围岩的破坏程度迅速减小,超过这一范围后,围岩的破坏程度逐渐减小。
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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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