摘要
为探究煤岩组合体的动态冲击力学特性和破坏时的应变演化情况,利用分离式霍普金森压杆装置结合高速摄像系统,分别对岩煤岩和煤岩煤组合体开展轴向冲击试验。采用数字图像相关技术观测试件全场应变变化,对比分析了两种组合体在不同冲击速度下的动态应力应变曲线、动态抗压强度、破坏过程图像和应变云图。试验结果表明,相同直径、高度下的岩煤岩的动态抗压强度大于煤岩煤;岩煤岩组合体在加载初期经历的压密阶段较短;不同冲击速率下,两种煤岩组合体的起裂均为煤层端部的破坏。
In order to explore the dynamic impact mechanical properties of coal-rock assemblies and the strain evolution of failure,the split Hopkinson pressure bar device combined with the high-speed camera system was used to carry out axial impact tests on the rock-coal-rock and coal-rock-coal combination.The dynamic stress strain curve,dynamic compressive strength,failure process and strain cloud diagram of the two combinations at different impact speeds were compared and analyzed by using digital image related technology to view the full-field strain change of the test piece.The experimental results are as follows.The dynamic compressive strength of the rock-coal-rock with the same diameter and height is greater than that of the coal-rock-coal.The coal-rock assemblies undergo a shorter compaction phase at the beginning of loading.At different impact rates,the beginning cracking site of the two coal-rock assemblies is at the coal seam.
作者
宫能平
朱丽凡
GONG Nengping;ZHU Lifan(School of Mathematics and Big Data,Anhui University of Science and Technology,Huainan Anhui 232001,China;School of civil engineering and architecture,Anhui University of Science and Technology,Huainan Anhui 232001,China)
出处
《安徽理工大学学报（自然科学版）》
CAS
2022年第6期43-51,共9页
Journal of Anhui University of Science and Technology:Natural Science
基金
江汉大学省部共建精细爆破国家重点实验室、江汉大学爆破工程湖北省重点实验室联合开放基金资助项目(PBSKL2022B01)。
