冲击荷载下夹层复合岩石能量演化及断裂特征研究  

Study on Energy Evolution and Fracture Characteristics of Sandwich Composite Rock under Impact Load

作　　者：刘小庆 宋佳辉 张瑶瑶 孔维文 梅洪嘉 王雁冰[4] LIU Xiao-qing;SONG Jia-hui;ZHANG Yao-yao;KONG Wei-wen;MEI Hong-jia;WANG Yan-bing(Guoneng Shendong Coal Technology Research Institute,Yulin 719000,China;State Key Laboratory of Water Resources Protection and Utilization in Coal Mining,Beijing 102211,China;National Institute of Clean and Low Carbon Energy,Beijing 102211,China;School of Mechanics and Civil Engineering,China University of Mining&Technology-Beijing,Beijing 100083,China)

机构地区：[1]国能神东煤炭技术研究院,榆林719000 [2]煤炭开采水资源保护与利用全国重点实验室,北京102211 [3]北京低碳清洁能源研究院,北京102211 [4]中国矿业大学(北京)力学与土木工程学院,北京100083

出　　处：《爆破》2024年第3期33-42,共10页Blasting

基　　金：煤炭开采水资源保护与利用国家重点试验室开放基金课题资助(GJNY-21-41-06);新疆维吾尔自治区重点研发任务专项(2022B03028-3);中国矿业大学(北京)越崎青年学者资助项目资助(No.800015Z11A24)。

摘　　要：为研究冲击荷载下夹层复合岩石能量演化及断裂特征,选用砂岩、大理岩和花岗岩3种材料制成6组不同的夹层复合岩石试件,利用霍普金森压杆系统进行动态断裂冲击试验,研究不同复合岩石试件的裂纹扩展形态、应力波波形特征、裂纹尖端应力场和能量损耗关系,同时结合DLSM模拟结果,分析动态断裂过程中的应力波传播规律以及动能演化过程。结果表明:高速相机拍摄的动态断裂过程与DLSM模拟裂纹扩展过程具有良好的拟合度;裂纹的产生情况取决于层理弱面的破坏情况,相同冲击条件下,仅层理弱面不同的试件,层理弱面强度越低,裂纹扩展的时间越短且越靠前,夹层材料硬度越小,用于裂纹扩展的能量越多;在相同入射能量条件下,硬度较大的试件作为冲击端材料时,试件的反射作用较强,反射能量较大,透射作用较弱,透射能量较小,试件的能量耗散较大;层理面对应力波传播具有明显的阻碍作用,产生的透射波在尖端积蓄能量直至切缝起裂,试件综合硬度增大后,透射波明显减弱,并且传播速度减缓。In order to study the energy evolution and fracture characteristics of sandwich composite rocks under impact loads,six sets of sandwich composite rock specimens were created using three materials:sandstone,marble,and granite.Dynamic fracture impact tests were then conducted using the Hopkinson pressure bar system to analyze crack propagation morphology,stress wave waveform characteristics,crack tip stress field,and energy loss relationship.The DLSM simulation results were also used to analyze the propagation law of stress waves and the evolution process of kinetic energy during dynamic fracture processes.The results showed a good fit between the dynamic fracture process captured by high-speed cameras and the crack propagation process simulated by DLSM.It was observed that the occurrence of cracks depends on the failure of weak bedding planes.Under the same impact conditions,the lower the strength of the weak bedding planes,the shorter and more advanced the crack propagation time,and the more energy is used for crack propagation.Additionally,under the same incident energy conditions,using a specimen with higher hardness as the impact end material results in a stronger reflection effect,greater reflection energy,weaker transmission effect,smaller transmission energy,and greater energy dissipation of the specimen.The bedding plane was found to have a significant hindering effect on the propagation of stress waves.

关 键 词：岩石力学 SHPB NSCB 夹层试件 动态断裂 能量演化 

分 类 号：TD235.3[矿业工程—矿井建设]