Abstract

The thermal and mechanical tests of different porosity limestone show that an increase in the axial load results in the higher velocities of elastic waves while elevation of temperature decreases them. Higher temperatures act to raise velocities of P- and S-waves with increasing mechanical load, which enhances acoustic strain-sensitivity of rock. The spectral analysis of the recorded signals shows that higher temperature shifts spectrum maxima to lower frequency region. It is found that size of pores has influence on attenuation frequency of ultrasonic signals. The authors describe new approaches to acoustic strain-sensitivity control in rocks and to stress measurement reliability enhancement toward stability of underground structures.

中文翻译：

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机械和热负荷下利马斯通孔隙率对P波和S波速度的影响

摘要

不同孔隙度石灰石的热力和力学测试表明，轴向载荷的增加导致弹性波的速度提高，而温度升高则使弹性波的速度降低。较高的温度随着机械载荷的增加而提高了P波和S波的速度，从而增强了岩石的声应变敏感性。记录信号的频谱分析表明，较高的温度将频谱最大值移至较低的频率区域。发现孔的大小对超声信号的衰减频率有影响。作者介绍了岩石中的声应变敏感度控制和应力测量可靠性增强对地下结构稳定性的新方法。