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Effects of different pull-out loading rates on mechanical behaviors and acoustic emission responses of fully grouted bolts

不同拉拔加载速率对全长锚固锚杆力学行为和声发射响应的影响

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Abstract

Due to the influence of mining disturbance stress, it is of great significance to better understand the bearing characteristics of fully grouted bolts under different pull-out loading rates. For this purpose, a series of laboratory pull-out tests were conducted to comprehensively investigate the effects of different pull-out loading rates on the mechanical performance and failure characteristics of fully grouted bolts. The results show that the mechanical performance of the anchored specimen presents obvious loading rate dependence and shear enhancement characteristics. With the increase of the pull-out loading rates, the maximum pull-out load increases, the displacement and time corresponding to the maximum pull-out load decrease. The accumulated acoustic emission (AE) counts, AE energy and AE events all decrease with the increase of the pull-out loading rates. The AE peak frequency has obvious divisional distribution characteristics and the amplitude is mainly distributed between 50–80 dB. With the increase of the pull-out loading rates, the local strain of the anchoring interface increases and the failure of the anchoring interface transfers to the interior of the resin grout. The accumulated AE counts are used to evaluate the damage parameter of the anchoring interface during the whole pull-out process. The analytical results are in good agreement with the experimental results. The research results may provide guidance for the support design and performance monitoring of fully grouted bolts.

摘要

考虑到采矿扰动应力的影响,更好地理解不同拉拔加载速率下全长锚固锚杆的承载特性具有重要意义。本文采用一系列的实验室拉拔试验研究了不同拉拔加载速率对全长锚固锚杆力学性能和失效特性的影响。结果表明,锚固试件的力学性能表现出明显的加载速率依赖性和剪切增强特性。随着拉拔加载速率的增加,锚固试件的峰值拉拔载荷增大,而峰值拉拔载荷对应的位移和时间却减小,锚固试件的耐久性显著降低。同时,累积的声发射振铃计数、能量和事件数均随着拉拔加载速率的增加而减小。声发射事件的峰值频率呈现出明显的分区集中分布特征,振幅主要分布在 50~80 dB 的范围内。随着拉拔加载速率的增加,锚固界面的局部应变增大,且锚固界面的失效逐渐由局部剪切失效向整体剪切失效过渡。累积声发射振铃计数可用于评估拉拔过程中锚固界面的损伤特征,且分析结果与实验结果具有较好地一致性。该研究结果可为全长锚固锚杆的支护设计和性能监测提供参考。

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Funding

Projects(51925402, U1710258, 52004172) supported by the National Natural Science Foundation of China; Project(20201102004) supported by the Science and Technology Department of Shanxi Province, China

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DU Yun-lou conducted the experiments and wrote the first draft of the manuscript. FENG Guorui and KANG Hong-pu provided the concept and edited the draft of manuscript. ZHANG Yu-jiang and ZHANG Xi-hong edited the draft of manuscript.

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Correspondence to Guo-rui Feng  (冯国瑞).

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DU Yun-lou, FENG Guo-rui, KANG Hong-pu, ZHANG Yu-jiang and ZHANG Xi-hong declare that they have no conflict of interest.

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Du, Yl., Feng, Gr., Kang, Hp. et al. Effects of different pull-out loading rates on mechanical behaviors and acoustic emission responses of fully grouted bolts. J. Cent. South Univ. 28, 2052–2066 (2021). https://doi.org/10.1007/s11771-021-4752-4

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