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通过在单轴压缩下实施的声发射测试,研究焦作砂岩受20～1 200℃温度作用后的声发射演变过程;结合不同温度下砂岩的力学性质,通过声发射参数分析研究砂岩在不同受力阶段的声发射特点。研究表明:400℃以内温度对砂岩的声发射影响不太明显,在100℃后和600℃后声发射振铃累计数均发生急剧变化,100℃是砂岩裂纹扩展发育的门槛值,600℃后砂岩内部结构成分发生了变化,声发射现象较为明显。600～1 200℃时,砂岩呈现出明显的脆塑性转变现象,高温导致声发射信号的时间有所推迟,声发射信号增长率不断上升。1 200℃后,砂岩释放密集的声发射信号,呈现出塑性破坏特征。
Through the acoustic emission test carried out under uniaxial compression, the evolution of acoustic emission of Jiaozuo sandstone under the temperature of 20-1,200 ℃ was studied. According to the mechanical properties of sandstone at different temperatures, the acoustic emission parameters of the sandstone under different stress Acoustic emission characteristics of the stage. The results show that the acoustic emission of sandstone is not obvious when the temperature is below 400 ℃, and the cumulative number of ringing changes after 100 ℃ and 600 ℃ are sharp changes. 100 ℃ is the threshold for sandstone crack growth. After 600 ℃ Sandstone internal structural components have changed, the phenomenon of acoustic emission is more obvious. At 600 ~ 1200 ℃, the sandstone shows obvious brittle-plastic transition phenomenon. The high temperature leads to the delay of acoustic emission signal and the increase rate of acoustic emission signal. After 1 200 ℃, the sandstone released intensive acoustic emission signals and showed the characteristics of plastic failure.