摘要
《爆破工程》课程是土木和采矿类专业教学的基础核心课程。为了提高学生对岩石材料动态力学响应和损伤破坏机理的认识与理解,在培养方案中开设岩石材料的爆炸与冲击动力学实验教学内容以更好地实现《爆破工程》课程教学目标。针对学生缺乏在爆破工程方面的冲击动力学理论知识和实验基础等问题,将分离式霍普金森压杆(Split Hopkinson Pressure Bar,SHPB)实验技术和二维平板爆破(Two-Dimensional Plate Blasting,TDPB)实验技术应用于《爆破工程》的实践教学中。介绍了SHPB和TDPB的实验系统组成和实验计算原理;设计了岩石材料的SHPB冲击压缩实验课程内容和TDPB中心起爆实验课程内容;分析了SHPB实验下砂岩材料的动态力学行为与能量演化特征和TDPB实验下类砂岩材料的应变波演化与动力损伤破裂行为机理;引导了学生对岩石冲击动力学关键问题的深入讨论。教学实践效果表明:通过采用SHPB和TDPB实验课程与《爆破工程》理论课程相结合的教学模式,锻炼了学生的理论实践能力,提升了学生的科研探索水平,增进了学生的团队协同互助意识,实现了《爆破工程》课程教学目标。
Blasting Engineering is an essential core course for civil engineering and mining majors.To improve the students′understanding on dynamic mechanical response and damage mechanism of rock materials,the experimental teaching contents of explosion and impact dynamics of rock materials were set up in a training plan to achieve the teaching goal of the course of Blasting Engineering.In view of students′lack of theoretical knowledge and experimental basis of impact dynamics in blasting engineering,the split Hopkinson pressure bar(SHPB)experiment technology and two-dimensional plate blasting(TDPB)experiment technology were applied to the practical teaching of Blasting Engineering.Firstly,the experimental system compositions and calculation principles of SHPB and TDPB were introduced.Secondly,the course contents of SHPB impact compression experiment and TDPB central blasting experiment of rock materials were designed.Thirdly,the dynamic mechanical behavior and energy evolution characteristics of sandstone material under the SHPB experiment and the strain wave evolution and dynamic damage and fracture behavior mechanism of sandstone-like material under the TDPB experiment were analyzed.Finally,the students′in-depth discussion on the critical problems of rock impact dynamics was guided.The innovative combination of SEM testing technology and impact dynamics experimental technology revealed the damage mechanism of rock materials under SHPB and TDPB experiments to students from the micro-level,which gave the students a clear understanding of meso-damage and macro-failure.The effect of teaching practice shows that the student′s theoretical and practical ability is exercised by combining the experimental course of SHPB and TDPB with the theoretical course of Blasting Engineering,which leads to the improvement of students′scientific research ability and the sense of teamwork,and the fulfillment of the teaching goals.
作者
杨荣周
徐颖
YANG Rong-zhou;XU Ying(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China;State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan 232001,China)
出处
《爆破》
CSCD
北大核心
2024年第3期248-260,共13页
Blasting
基金
安徽理工大学校级教育教学改革研究项目(2023xjjy12)
安徽省高等学校自然科学研究重点项目(2023AH051167)
安徽理工大学高层次引进人才科研启动基金(2022yjrc84)
国家自然科学基金(52074009、52274071)。
