绢云母石英片岩和砂岩的SHPB试验研究

 利用液压伺服压力试验机和波形整形器改进后的? 100 mm分离式霍普金森压杆(SHPB)试验装置，研究绢云母石英片岩和砂岩在50～160 s－1应变率等级下的准静态力学性能及其在不同冲击压缩荷载作用下的波形曲线、动态抗压强度、比能量吸收以及破坏形态的应变率效应问题。试验结果表明，绢云母石英片岩和砂岩的动态抗压强度、比能量吸收以及破坏形态均表现出显著的应变率相关性，但弹性模量的应变率相关性较弱。综合绢云母石英片岩和砂岩动态力学性能的对比结果可知，砂岩比绢云母石英片岩对应变率的变化更敏感。从材料的微观结构特征和能量吸收的角度对岩石动态破坏过程进行分析，探寻岩石破坏的本质。研究成果可为其他类型的脆性材料动态力学性能的研究提供参考。

SHPB EXPERIMENTAL STUDY OF SERICITE-QUARTZ SCHIST AND SANDSTONE

By using the hydraulic and servo-controlled pressure testing machine and the split Hopkinson pressure bar(SHPB) testing apparatus of 100 mm in diameter，which is improved by pulse shaping technique，the experimental tests of sericite-quartz schist and sandstone with strain rate varying from 50–160 s－1 under shock compression loading are carried out to study the quasi-static mechanical properties and relationship among wavy curves，dynamic compressive strength，specific energy absorption and strain rate effect of fracture forms of the two rocks. The experimental results show that the dynamic compressive strength，specific energy absorption and fracture forms of sericite-quartz schist and sandstone have significant correlation with strain rate. However，there is no significant correlation with strain rate can be seen for elastic moduli of the two rocks. The dynamic mechanical comparison results of sericite-quartz schist and sandstone show that sandstone is more sensitive to strain rate than sericite-quartz schist. In the sight of microstructure characteristics and energy absorption of sericite-quartz schist and sandstone，dynamic fracture process is analyzed；and crucial factors influencing the characteristics of fracture are discussed. The research method and conclusions can provide references for analyzing dynamic mechanical behavior of other kinds of brittle materials.