叶海旺,李睿,路东,于燕,余梦豪,雷涛,王其洲,李宁,Doumbouya Sekou

• 1:武汉理工大学资源与环境工程学院
• 2:关键非金属矿产资源绿色利用教育部重点实验室
• 3:矿物资源加工与环境湖北省重点实验室
• 4:武汉市公安局治安管理局

摘要(Abstract)：

为研究品位和动荷载耦合作用下晶质石墨矿石的动态力学响应特征，利用直径50 mm的分离式Hopkinson压杆试验装置对5.19%、10.79%、12.65%和15.50%四种不同品位的晶质石墨矿石试样开展了不同冲击气压下的动态压缩试验，对比分析了品位和应变率对晶质石墨矿石动态力学特性和能耗特性的影响，并基于黏弹性朱-王-唐模型建立了考虑品位和应变率的晶质石墨矿石动态本构模型。试验结果表明：晶质石墨矿石动态抗压强度和峰值应变均随着应变率提高而逐渐增大，而弹性模量与应变率无关；随着品位的提高，矿石试样的初始压密变形量和峰值应变增大，动弹性模量、动态抗压强度及其率敏感性逐渐下降；此外，中低品位矿石的破碎程度在一定应变率范围内随能耗密度的增大而加剧，但高品位矿石破碎程度变化不大，表明品位对晶质石墨矿石的动态破碎行为有显著影响；建立考虑品位和应变率的晶质石墨矿石动态本构模型，通过对比所建立的动态本构模型和试验得到的动态应力-应变曲线，验证了模型的准确性和适用性，为晶质石墨矿石在动荷载作用下的力学行为研究提供了理论支持。

关键词(KeyWords)： 岩石动力学;SHPB试验;石墨矿石;损伤本构模型

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2020YFC1909602、2021YFC2902901);; 湖北省重点研发计划(2021BCA152)~~

作者(Author): 叶海旺,李睿,路东,于燕,余梦豪,雷涛,王其洲,李宁,Doumbouya Sekou

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