南华大学学报（自然科学版）2025，Vol.39Issue(1)：35-43,55,10.DOI:10.19431/j.cnki.1673-0062.2025.01.006
不同冲击荷载下的磷矿岩破裂机理研究
Study on Fracture Mechanism of Phosphate Rock Under Different Impact Loads
摘要
Abstract
To study the fracture characteristics of phosphate rocks under different impact loads(different strain rates),the impact compression test of Yichang phosphate rocks un-der different impact loads was carried out by SHPB(split-Hobkinson pressure bar)tech-nique.The stress-strain curves of phosphate rocks under different impact loads were ob-tained,and the failure mechanism of phosphate rocks was analyzed.Meanwhile,the nu-merical simulation of the microscopic granular flow was performed to obtain the experimen-tal fracture characteristics of the rocks.The results suggest that under low strain-rate load-ing conditions,the specimen was primarily dominated by intergranular tensile failure;as the strain-rate increased,the incidence rate of transgranular shear increased accordingly.Under high strain-rate conditions,the specimens were broken up into even smaller pieces,with multiple cracks and a higher incidence rate of shear failure,which was completely different from the failure mode of phosphate rocks under low strain rate conditions.This is the main mechanism for the strength increase of the phosphate rock under high strain-rate conditions.关键词
冲击荷载/磷矿岩/分离式霍布金森压杆(SHPB)/破裂特性/颗粒流数值模拟Key words
impact load/phosphate rock/split-Hobkinson pressure bar(SHPB)/fracture characteristics/particle flow code(PFC2D)分类
土木建筑引用本文复制引用
曾勇,陈文昭,胡荣,卢铎方..不同冲击荷载下的磷矿岩破裂机理研究[J].南华大学学报（自然科学版）,2025,39(1):35-43,55,10.基金项目
湖南省自然科学基金项目(2023JJ30511) （2023JJ30511）
湖南省自然资源科研项目(20230144DZ) （20230144DZ）
湖南省教育厅项目(重点)(18A252) （重点）
