Abstract

Cemented tailings backfill (CTB) structures are important components of underground mine stopes. It is important to investigate the characteristics and dynamic behavior of CTB materials because they are susceptible to disturbance by dynamic loading, such as excavation and blasting. In this study, the authors present the results of a series of Split-Hopkinson pressure bar (SHPB) single and cyclic impact loading tests on CTB specimens to investigate the long-term dynamic mechanical properties of CTB. The stress-strain relationship, dynamic strength, and dynamic failure characteristics of CTB specimens are analyzed and discussed to provide valuable conclusions that will improve our knowledge of CTB long-term mechanical behavior and characteristics. For instance, the dynamic peak stress under cyclic impact loading is approximately twice that under single impact loading, and the CTB specimens are less prone to fracture when cyclically loaded. These findings and conclusions can provide a new set of references for the stability analysis of CTB materials and help guide mine designers in reducing the amount of binding agents and the associated mining cost.

中文翻译：

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冲击载荷作用下胶结尾矿回填的长期力学性能和特性

摘要

水泥尾矿回填（CTB）结构是地下矿场的重要组成部分。研究CTB材料的特性和动态行为很重要，因为它们容易受到动态载荷（例如开挖和爆破）的干扰。在这项研究中，作者介绍了一系列在CTB标本上进行的斯普利特-霍普金森压力杆（SHPB）单次和循环冲击载荷试验的结果，以研究CTB的长期动态力学性能。分析和讨论了CTB试样的应力-应变关系，动态强度和动态破坏特性，以提供有价值的结论，这将增进我们对CTB长期力学行为和特性的认识。例如，循环冲击载荷下的动态峰值应力大约是单次冲击载荷下的两倍，而CTB试样在循环载荷下不易断裂。这些发现和结论可为CTB材料的稳定性分析提供一组新的参考，并有助于指导矿山设计人员减少粘合剂的用量和相关的开采成本。