爆破2025，Vol.42Issue(3)：26-36,152,12.DOI:10.3963/j.issn.1001-487X.2025.03.004
石墨矿石动力学特性及本构模型研究
Study on Dynamic Properties and Constitutive Model of Graphite Ore
摘要
Abstract
In order to study the dynamic mechanical response characteristics of crystalline graphite ore under the coupling effect of grade and dynamic load,the dynamic compression tests of crystalline graphite ore samples with four grade levels(5.19％,10.79％,12.65％,and 15.50％)under different impact pressures were carried out by using a 50 mm diameter split Hopkinson pressure bar test device.The effects of grade and strain rate on the dynamic me-chanical properties and energy consumption characteristics of crystalline graphite ore were comparatively analyzed.Furthermore,a dynamic constitutive model for crystalline graphite ore incorporating both grade and strain rate effects was established based on the viscoelastic ZWT model.The test results show that the dynamic compressive strength and peak strain of crystalline graphite ore increase progressively with rising strain rate,while the elastic modulus re-mains strain-rate-independent.As the ore grade increases,the initial compaction deformation and peak strain of the samples increase,whereas the dynamic elastic modulus,dynamic compressive strength,and their strain-rate sensitivity gradually decrease.Additionally,within a specific strain rate range,the degree of fragmentation of medium-and low-grade ores intensifies with increasing energy consumption density.In contrast,high-grade ores exhibit minimal varia-tion in fragmentation degree.This indicates that ore grade significantly influences the dynamic fragmentation behavior of crystalline graphite ore.A dynamic constitutive model that considers both grade and strain rate was established,and its accuracy and applicability were verified by comparing the model-predicted results with experimentally ob-tained dynamic stress-strain curves.The model offers theoretical support for investigating the mechanical behavior of crystalline graphite ore under dynamic loading.关键词
岩石动力学/SHPB试验/石墨矿石/损伤本构模型Key words
rock dynamics/SHPB test/crystalline graphite ore/damage constitutive model分类
矿业与冶金引用本文复制引用
叶海旺,李睿,路东,于燕,余梦豪,雷涛,王其洲,李宁,Doumbouya Sekou..石墨矿石动力学特性及本构模型研究[J].爆破,2025,42(3):26-36,152,12.基金项目
国家重点研发计划(2020YFC1909602、2021YFC2902901) （2020YFC1909602、2021YFC2902901）
湖北省重点研发计划(2021BCA152) The National Key Research and Development Project of China(Grant No.2020YFC1909602 and Grant No.2021YFC2902901),the Key Research and Development Project of Hubei province,China(Grant No.2021BCA152) （2021BCA152）
