砂岩单轴压缩变形规律及声发射特性

为准确确定岩石岩爆倾向性,对砂岩进行单轴压缩条件下声发射检测试验,研究岩样单轴压缩变形规律与声发射特征.对荷载-变形曲线、AE参数进行统计分析,结果表明,压密阶段和线弹性阶段声发射振铃计数较少,累积能量曲线十分平缓,释放弹性应变能较低,从塑性变形阶段开始,AE活动频繁,累积能量呈指数级释放,损伤加快,声发射类型由之前的突发型变为连续型,应变曲线拐点处,往往出现AE参数峰值.分别对AE振铃计数、累积能量和岩石损伤进行监测分析,能较准确判断砂岩岩爆倾向性.

Deformation rules and acoustic emission characteristics of sandstone uniaxial compression

This paper studies the acoustic emission （AE） for sandstone to accurately determine rock burst tendency. The deformation and acoustic emission characteristics under the uniaxial loading rock burst are studied by analyzing the load - deformation curve and AE characteristics. The results show fiat accumulative energy curve and low released elastic strain energy in compaction phase and linear elastic stage with small amount of acoustie emission figures. Frequent AE activity and exponentially released cumulative energy, accelerated rock damage occurred beginning from plastic deformation stage with the variation of acoustic emission type from the previous burst-type to continuous. The peak of AE parameter is observed at strain curve inflection point. The surveillance and analysis of AE ring-down count, cumulative energy and rock damage can accurately determine the sandstone rock burst tendency.