Numerical simulation on the dynamic mechanical response and fracture mechanism of rocks containing a single hole

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Science & Technology Pub Date : 2024-07-19 DOI:10.1007/s40789-024-00718-5
Zhenyu Han, Kai Liu, Jinyin Ma, Diyuan Li
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Abstract

Caverns and tunnels are constantly exposed to dynamic loads, posing a potentially significant threat to the safety of rock structures. To facilitate the understanding of dynamic fracture around openings, a series of discrete element models were established to numerically examine the effect of hole shape on dynamic mechanical properties and crack evolution. The results indicate that the existence of a hole greatly reduces dynamic strength, and the reduction is closely related to hole shape. The strain variation of pre-holed specimens is more complicated and even larger than the value of intact specimens. Although crack initiation differs for varying hole shapes, the entire structural collapse of specimens is controlled by macro shear cracks along the diagonal direction of the specimen, which are effectively identified by velocity trend arrows and contact force distribution. Finally, comparative analysis between failure pattern of pre-holed specimens under static and dynamic loads were conducted.

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含单孔岩石的动态力学响应和断裂机制的数值模拟
岩洞和隧道经常受到动态载荷的影响,对岩石结构的安全构成潜在的重大威胁。为了便于理解洞口周围的动态断裂,我们建立了一系列离散元素模型,以数值方法研究洞口形状对动态力学性能和裂缝演化的影响。结果表明,孔洞的存在大大降低了动态强度,而动态强度的降低与孔洞形状密切相关。预孔试样的应变变化更为复杂,甚至大于完整试样的应变值。虽然不同孔型的裂纹起始点不同,但试样的整个结构坍塌是由沿试样对角线方向的宏观剪切裂纹控制的,这些裂纹可以通过速度趋势箭头和接触力分布有效识别。最后,对预孔试样在静载和动载下的破坏模式进行了对比分析。
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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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