摘要
为探究冲击载荷作用下砂岩动态拉伸力学响应特性,借助∅50 mm分离式霍普金森压杆系统,对砂岩开展动态巴西劈裂圆盘实验。研究结果表明:冲击载荷下砂岩动态抗拉强度随加载率的增大而增大,呈二次函数关系,且砂岩峰值应变与加载率呈负相关关系;砂岩动态拉伸破坏过程中,破碎耗散包括3个阶段:性储能阶段、塑性变形储能阶段、破坏稳定阶段,其中入射能、反射能、透射能均随加载率的增大而增大,呈一次函数关系(R^(2)≥0.84),能耗率呈二次函数关系(R^(2)=0.98)。研究成果为煤矿围岩控制提供借鉴参考。
To investigate the dynamic tensile mechanical response characteristics of sandstone under impact load,the∅A 50 mm split Hopkinson compression rod system was used to conduct dynamic Brazilian splitting disk experiments on sandstone.The research results indicate that the dynamic tensile strength of sandstone under impact load increases with the increase of loading rate,in a quadratic function relationship,and the peak strain of sandstone is negatively correlated with loading rate;In the process of dynamic tensile failure of sandstone,the fragmentation dissipation includes three stages:plastic energy storage stage,plastic deformation energy storage stage,and failure stability stage.Among them,the incident energy,reflected energy,and transmitted energy all increase with the increase of loading rate,showing a linear function relationship(R^(2)≥0.84),and the energy consumption rate shows a quadratic function relationship(R^(2)=0.98).The research results provide reference for the control of coal mine surrounding rocks.
出处
《中国矿山工程》
2023年第5期47-52,共6页
China Mine Engineering
关键词
巴西劈裂
动态拉伸
SHPB
砂岩
能量耗散
brazilian splitting
dynamic stretching
SHPB
sandstone
energy dissipation
