利用三维离散元方法研究应变岩爆的自发静态-动态状态转换行为和触发机制

IF 8.2 1区 工程技术 Q1 ENGINEERING, CIVIL
Yuan Qian , Cheng Zhao , Rui Wei , Rui Zhang , Lin Huang , Huiguan Chen
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引用次数: 0

摘要

准确理解岩爆机理是岩石力学领域的一项全球性挑战。特别是对于应变岩爆而言,实现自发的静态-动态状态转换是形成灾难性事件的关键步骤。然而,状态转换行为及其对岩爆的影响并没有得到足够的重视,人们对其的了解也还很不够。因此,本研究特别关注状态转换行为,旨在研究其突然转换过程和形成机制,以及对岩爆的触发效应。为便于研究,本文提出了一种新型爆裂岩-围岩组合实验室试验模型,并通过实验验证了其有效性。随后,利用三维离散元法(DEM)建立了相应的数值模型,成功模拟了准静态位移加载条件下的静态脆性破坏和不同强度的岩爆。此外,通过二次开发,还可全面记录与组合试样系统及其子系统相关的机械和能量信息。数值调查研究发现,围岩的弹性回弹动态行为是引发岩爆并控制其强度的关键因素。由弹性回弹引起的对爆裂岩石的冲击载荷直接启动了岩爆的动态过程,是岩爆的直接原因。此外,弹性回弹产生的瞬时功和能量向爆破岩体汇聚,也被认为是岩爆的内在原因。此外,据观察,围岩范围越大,弹性反弹越强,从而直接导致岩爆强度越大。这些发现可为岩爆机理的探索以及监测和预防技术的开发提供新的理论见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Self-initiated static-dynamic state transition behavior and triggering mechanism of strain rockburst using three-dimensional discrete element method

The accurate understanding of rockburst mechanism poses a global challenge in the field of rock mechanics. Particularly for strain rockburst, achieving self-initiated static-dynamic state transition is a crucial step in the formation of catastrophic events. However, the state transition behavior and its impact on rockburst have not received sufficient attention, and are still poorly understood. Therefore, this study specifically focuses on the state transition behavior, aiming to investigate its abrupt transition process and formation mechanism, and triggering effects on rockburst. To facilitate the study, a novel burst rock-surrounding rock combined laboratory test model is proposed and its effectiveness is validated through experiment verification. Subsequently, corresponding numerical models are established using the three-dimensional (3D) discrete element method (DEM), enabling successful simulation of static brittle failure and rockbursts of varying intensities under quasi-static displacement loading conditions. Moreover, through secondary development, comprehensive recording of the mechanical and energy information pertaining to the combined specimen system and its subsystems is achieved. As a result of numerical investigation studies, the elastic rebound dynamic behavior of the surrounding rock was discovered and identified as the key factor triggering rockburst and controlling its intensity. The impact loading on the burst rock, induced by elastic rebound, directly initiates the dynamic processes of rockburst, serving as the direct cause. Additionally, the transient work and energy convergence towards the burst rock resulting from elastic rebound are recognized as the inherent cause of rockburst. Moreover, it has been observed that a larger extent of surrounding rock leads to a stronger elastic rebound, thereby directly contributing to a more intense rockburst. The findings can provide novel theoretical insights for the exploring of rockburst mechanism and the development of monitoring and prevention techniques.

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来源期刊
Underground Space
Underground Space ENGINEERING, CIVIL-
CiteScore
10.20
自引率
14.10%
发文量
71
审稿时长
63 days
期刊介绍: Underground Space is an open access international journal without article processing charges (APC) committed to serving as a scientific forum for researchers and practitioners in the field of underground engineering. The journal welcomes manuscripts that deal with original theories, methods, technologies, and important applications throughout the life-cycle of underground projects, including planning, design, operation and maintenance, disaster prevention, and demolition. The journal is particularly interested in manuscripts related to the latest development of smart underground engineering from the perspectives of resilience, resources saving, environmental friendliness, humanity, and artificial intelligence. The manuscripts are expected to have significant innovation and potential impact in the field of underground engineering, and should have clear association with or application in underground projects.
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