Abstract The development of mining and underground excavations under high stress conditions, where the occurrence of seismic events may induce sudden energy release, has generated new challenges and additional research related to the dynamic response of reinforcement systems. To ensure safety of underground excavations, the development of new reinforcement elements able to resist dynamic events and yielding during the loading process has advanced in the last 30 years as a result of research studies and testing programs carried out by recognized institutions. The execution of these testing programs involves a considerable time and requires validation. In Chile, the development of a new laboratory-scale dynamic test facility has required several studies in which numerical modelling is considered as an important part of the design process. This paper presents the implementation and results of a numerical model used to simulate the dynamic response of threadbar under laboratory-scale test conditions. A comprehensive calibration of the numerical model using the results of laboratory-scale dynamic tests available from the literature is presented. The continuous and split configurations for the encapsulating tube are tested and compared. A parametric analysis is performed with the calibrated model. The verification of the model is established with an additional laboratory-scale result not considered in the calibration process. A summary of the results in terms of the dissipated energy and the maximum displacement is presented. The results indicates a linear trend between the dissipated energy and the maximum displacement, and a significant improvement of the dynamic response of threadbar when the steel grade or the diameter of the rockbolt is increased.

中文翻译：

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实验室规模条件下螺纹杆动态响应的数值模拟

摘要 在高应力条件下采矿和地下开挖的发展，其中地震事件的发生可能导致突然的能量释放，产生了新的挑战和与加固系统动态响应相关的额外研究。为确保地下开挖的安全，在过去 30 年中，由于公认机构开展的研究和测试计划，开发了能够抵抗动态事件和装载过程中屈服的新型加固元件。这些测试程序的执行需要相当长的时间并需要验证。在智利，新实验室规模动态测试设施的开发需要进行多项研究，其中将数值建模视为设计过程的重要组成部分。本文介绍了用于模拟实验室规模测试条件下螺纹杆动态响应的数值模型的实现和结果。介绍了使用文献中可用的实验室规模动态测试结果对数值模型进行的综合校准。对封装管的连续和分体配置进行了测试和比较。使用校准模型执行参数分析。模型的验证是通过校准过程中未考虑的额外实验室规模结果建立的。给出了耗散能量和最大位移方面的结果摘要。结果表明耗散能量与最大位移之间呈线性趋势，