煤矿安全2024，Vol.55Issue(10)：158-165,8.DOI:10.13347/j.cnki.mkaq.20221767
循环动载冲击下加锚裂隙煤体力学响应试验研究
Experimental study on mechanical response of anchored fractured coal under cyclic dynamic loading
摘要
Abstract
In order to understand the mechanical response and failure characteristics of anchored fractured coal body under cyclic dy-namic load,the dynamic load impact test of anchored fractured coal under cyclic impact dynamic load was carried out by using the split Hopkinson pressure bar test system.The effects of cyclic dynamic load times and dynamic load impact strength on the stress-strain curves,bolt axial force and macroscopic failure of anchored fractured coal were analyzed.The results show that with the in-crease of dynamic load strain rate,the strength of anchorage specimen increases,but with the increase of dynamic load impact times,the strength of anchorage specimen decreases.When the impact input energy is constant,with the increase of impact times,the in-ternal cracks of coal gradually expand or even fail,and the limiting force of bolt on coal expansion decreases.Under high energy im-pact,the bolt cannot hinder the initiation and expansion of the internal cracks in the anchored fractured coal body,and the overall in-stantaneous failure of the anchored coal body is prone to occur.关键词
循环动载/锚杆支护/深部煤巷/力学响应/破坏特征Key words
cyclic dynamic load/anchor bolt support/deep coal mine roadway/mechanical response/characteristics of destruction分类
矿业与冶金引用本文复制引用
李振安,李壮..循环动载冲击下加锚裂隙煤体力学响应试验研究[J].煤矿安全,2024,55(10):158-165,8.基金项目
山东省自然科学基金资助项目(ZR2019QEE002) （ZR2019QEE002）
