矿业科学学报2026，Vol.11Issue(2)：369-379,11.DOI:10.19606/j.cnki.jmst.2026002
冲击载荷下凝灰岩破坏特征及能耗规律分析
Failure and energy dissipation patterns of tuff under impact loads
摘要
Abstract
This study investigates the failure and energy dissipation patterns of tuff under impact loads with varying occurrence conditions in Dahongshan Copper Mine through Split Hopkinson pressure bar(SHPB)tests,digital image correlation(DIC),fractal dimension analysis,scanning electron micros-copy and energy dispersive spectroscopy(SEM-EDS).Results show that:① At identical strain rate,the dynamic compressive strength of the 300-level tuff was only 71%～77%of that from the 420-level tuff.② Both types of specimens underwent a transition from uniform strain,local concentration to crack fragmentation.The 300-level tuff exhibited denser cracks,faster propagation,higher peak strain and higher degree of fragmentation under equivalent impact load.③ While the crushing energy dissipa-tion density of both types of specimens increased linearly with impact load,the 300-level tuff exhibited significantly higher average energy absorption efficiency(35.86%)than the 420-level tuff(19.29%).This study reveals how varying rock microstructures and composition affect the dynamic mechanical properties of ore and rock under impact load,providing theoretical implications for their stability analy-sis under dynamic load and safe mining.关键词
不同赋存条件/动态力学特性/裂纹扩展/分形维数/SEM-EDS/能量耗散Key words
varying occurrence conditions/dynamic mechanical properties/crack propagation/fractal dimension/SEM-EDS/energy dissipation分类
矿业与冶金引用本文复制引用
崔光久,李祥龙,左庭,霍飞,王建国,何应明..冲击载荷下凝灰岩破坏特征及能耗规律分析[J].矿业科学学报,2026,11(2):369-379,11.基金项目
国家自然科学基金(52274083) （52274083）
云南省重大科技专项(202202AG050014) （202202AG050014）
云南省基础研究计划面上项目(202201AT070178) （202201AT070178）
云南省"兴滇英才支持计划"产学创新人才(KKXY202421005) （KKXY202421005）
