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Shotcrete: early strength and re-entry revisited - practices and technology

机译:Shotcrete:早期实力和重新入境重新入学 - 实践和技术

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Shotcrete, a globally employed support system of choice in underground mining, is required to perform its support function not only over the expected life of underground openings, but also from a safety and productivity perspective, at a very early age. The balance between placement ability, early strength and long-term performance is a delicate one which has been repeatedly improved upon as shotcrete has proliferated in mining and tunnelling. Early strength is particularly important in safeguarding the integrity of underground openings and the people and machinery which need to return to them as quickly as safety doctrine allows. This paper covers the state-of-the-art with respect to practices and technology which forms the basis for the safest, earliest re-entry policies. Technologies discussed include the examination of strength development via thermal imagery, infrared analysis, fibre performance, admixture and accelerator formulation, and robotic placement. Practices discussed cover approaches in both mining and tunnelling, early re-entry times and policies, and lessons learned anecdotally from contemporary case studies.Preservation of people and assets, the environment and cost savings are co-drivers of industry advances.
机译:Shotcrete,在地下采矿中的全球采用的支持系统,不仅需要在地下开口的预期寿命,也需要在一个非常令人难度的时代来实现其支持功能。放置能力,早期强度和长期性能之间的平衡是一种精致的,因为在采矿和隧道中增殖的喷射克雷特被反复改善。早期实力在维护地下开口和人员和机器的完整性方面尤为重要,这需要尽快返回它们的安全原则允许。本文涵盖了关于构成最安全,最早的重新入境政策的基础的实践和技术的最先进。所讨论的技术包括通过热图像,红外分析,纤维性能,混合物和加速器配方检查力量发展,以及机器人放置。实践讨论了挖掘和隧道,早期再入境时间和政策的求职方法,并从当代案例研究中轶事所吸取的经验教训。保存人和资产,环境和成本节约是行业进步的共同诉讼。

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