基于时能密度的围岩爆破安全判据实验

Experiment of surrounding rock blasting vibration safety criterion based on time-energy density

为了研究爆破震动荷载作用下巷道围岩的多因素综合安全判据,根据实际工程巷道制作缩尺巷道围岩模型,通过光纤光栅锚杆对巷道围岩在不同围岩压力、不同巷道损伤状态下的爆破震动响应信号进行监测,并对信号进行小波分解,基于时能密度函数计算响应信号的TEDI值,初步建立巷道围岩安全判据。结果显示,TEDI值与巷道围岩损伤程度存在定量关系,基于时能密度函数所建立的巷道围岩安全判据具有较高的可靠性,实际应用中可作为核心技术发展监测、诊断、预警技术,形成金属矿山巷道围岩稳定性评估体系。

Based on the scale model of practical engineering roadway and fiber bragg grating（FBG） anchor, the blasting vibration signals were monitored under different surrounding rock pressure and different damage status of roadway to study the multi-factor comprehensive safety criterion. The safety criterion was built by wavelet decompo-sition of the signals. The result shows that there is a quantitative relationship in TEDI value and the damage degree of the surrounding rock. The safety criterion based on the time-energy density function is reliable, which can be used as the core technology to develop the monitoring, diagnosis and early-warning technique in practice, thus forming the surrounding rock stability evaluation system of the metal mine.