冲击荷载下饱水角岩冲击力学特性和破碎规律研究  

Impact Mechanical Properties and Breaking Law Study of Saturated Hornfels under Impact Loads

作　　者：邰成群 张志平 张祝九 TAI Cheng-qun;ZHANG Zhi-ping;ZHANG Zhu-jiu(Faculty of Land and Resource Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650093,China;Yunnan Chihong Zn&Ge Co.,Ltd.,Qujing,Yunnan 655011,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]云南驰宏锌锗股份有限公司,云南曲靖655011

出　　处：《云南冶金》2023年第5期28-35,共8页Yunnan Metallurgy

摘　　要：通过分离式霍普金森压杆系统,对自然和饱水两种状态下的角岩进行相关动力学参数以及破碎规律分析。结果表明:饱水角岩相较于自然角岩,峰值应力较小;饱水角岩动态抗压强度减小约6.65%~24.28%;自然角岩应变率从27.46 s^(-1)增大到80.49 s^(-1)时大块占比由89.61%降低到10.99%,饱水角岩应变率从29.31 s^(-1)增大到76.55 s^(-1)时大块占比由85.61%降低到27.27%;饱水角岩试件的单位体积吸能密度ρ低于自然角岩,但总体呈现破碎块度分形维数D随着单位体积吸能密度ρ的增加而增加的相同趋势。The relative kinetic parameters and breaking law analysis of hornfels with two states that nature hornfels and saturated hornfels was done by adoption of split Hopkinson pressure bar system.Results show that:saturated hornfels has smaller peak stress than nature hornfels;the dynamic compressive strength of saturated hornfels was decreased by 6.65%~24.28%;when the strain rate of nature hornfels was increased from 27.46 s^(-1)to 80.49 s^(-1),bulk proportion was decreased from 85.61%to 27.27%;the energy absorption density(ρ)per unit volume of saturated hornfels is lower than nature hornfels,but on the whole,the crushing blockage fractal dimension(D)was increased along with the increasing of energy absorption densityρper unit volume.

关 键 词：岩石力学 冲击荷载 角岩 分形维数 

分 类 号：TD263[矿业工程—矿井建设]