基于声发射技术的石灰岩三轴加载试验研究

Research on Triaxial Loading Test of Limestone Based on Acoustic Emission Technology

通过室内三轴加载及声发射同步试验,研究了完整及损伤石灰岩在围压作用下变形破裂的声发射机理。试验研究表明:损伤石灰岩贯通破坏时,岩石轴向应力突降与声发射参数值突增时间具有一致性,沿着1条主裂缝发生贯通破坏;完整石灰岩贯通破坏时,岩石轴向应力突降时间滞后于声发射参数值突增时间,出现多条裂缝;声发射参数值可作为评估危险石灰岩稳定性的有效指标。

Through indoor triaxial loading and acoustic emission synchronous tests,the acoustic emission mechanism of intact and damaged limestone deformation and fracture under confining pressure is studied.The experimental research shows that when the damaged limestone penetrates and fails,the rock axial stress sudden drop is consistent with the sudden increase time of the acoustic emission parameter value,and the damaged limestone undergoes penetration failure along a main crack;when the complete limestone penetrates and fails,the rock axial stress sudden drop time lags behind the sudden increase time of the acoustic emission parameter value,and multiple cracks appear when the complete limestone penetrates and fails.Acoustic emission parameter values can be used as an effective index for evaluating the stability of dangerous limestone.