Dynamic properties of micro-NPR material and its controlling effect on surrounding rock mass with impact disturbances

IF 8.2 1区工程技术 Q1 ENGINEERING, CIVIL

Underground Space Pub Date : 2023-10-26 DOI:10.1016/j.undsp.2023.08.015

Manchao He , Jie Hu , Tai Cheng , Fei Deng , Zhigang Tao , Hongru Li , Di Peng

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引用次数: 0

Abstract

A novel meta steel with negative Poisson’s ratio effect (termed as micro-NPR steel) is developed for rock support in deep underground engineering. It possesses high strength, high ductility, and high energy absorption characteristics. In this paper, static tension and modified dynamic drop hammer tests are performed on this novel material to investigate its mechanical properties first. Then based on this material, a new generation of micro-NPR anchor cable is developed and applied in field tests subjected to blasting dynamic loads. The results of laboratory tests reveal that the ultimate elongation of micro-NPR steel under dynamic impacts is more than 30% and it is over 1.5 times that of Q235; the plastic and total energy absorption of micro-NPR are both significantly higher than that of Q235. Field test indicates the fine controlling effect of micro-NPR anchor cable on surrounding rock mass under dynamic loads. Axial force confirms that micro-NPR cables can distribute and absorb the dynamic energy uniformly around the supported rock when subjected to dynamic disturbance, avoiding local failure induced by excessive stress concentration. The excavation compensation principle and energy-absorbing characteristics are used to explain the support mechanisms. Thus, micro-NPR material and anchor cable can control and prevent dynamic disasters in deep underground engineering effectively.

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冲击扰动下微npr材料的动力特性及其对围岩的控制作用

开发了一种具有负泊松比效应的新型金属钢(微npr钢)，用于地下深部岩石支护。它具有高强度、高延展性、高能量吸收等特点。本文首先对这种新型材料进行了静拉伸试验和改进的动态落锤试验，研究了其力学性能。在此基础上研制了新一代微npr锚索，并将其应用于爆破动载荷下的现场试验。室内试验结果表明:微npr钢在动态冲击下的极限伸长率大于30%，是Q235的1.5倍以上;微npr的塑性和总吸能均显著高于Q235。现场试验表明，微npr锚索在动荷载作用下对围岩具有良好的控制效果。轴向力证实了微npr锚索在受到动力扰动时能够将动力能量均匀地分布和吸收在被支护岩石周围，避免了因应力过度集中而引起的局部破坏。利用开挖补偿原理和吸能特性来解释支护机理。因此，微npr材料和锚索可以有效地控制和预防深埋地下工程中的动力灾害。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Underground Space ENGINEERING, CIVIL-

CiteScore

10.20

自引率

14.10%

发文量

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.