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为准确拾取软弱破碎岩体中的爆破震动数据,在边坡平盘上钻凿直径为176 mm的深孔并用素混凝土浇筑,出露地表制作40 cm×40 cm混凝土承台作为传感器安装平台,同时在承台旁边软岩上设置对比测点,进行露天深孔台阶爆破震动监测,基于HHT法对同一位置的混凝土承台处和软弱破碎岩体处震动信号进行对比分析。结果表明,软弱破碎岩体处的质点峰值振速比混凝土承台处的质点峰值振速低11.53%~16.53%,对爆破震动信号进行瞬时能量分析和三维能量谱分析,能量的衰减基本与质点峰值振速的衰减保持一致,表明制作监测平台在软弱破碎岩体中进行爆破震动监测是精确捕捉震动数据的有效方法。通过对比试验可以看出,在软岩上做混凝土承台所得到的效果明显比不做任何处理效果要好。
In order to accurately pick up blasting vibration data in soft and fragmented rock mass, a deep hole with a diameter of 176 mm was drilled on the slope flat plate and poured with plain concrete to produce a 40 cm × 40 cm concrete platform as sensor mounting platform. Contrast measurement points were set up on the soft rock beside the caps to monitor the blasting vibration of open deep deep bench steps. Based on the HHT method, the seismic signals of the concrete cap at the same location and the weak broken rock mass were compared and analyzed. The results show that the peak vibration velocity of particle at weak broken rock mass is 11.53% ~ 16.53% lower than that of concrete cap, and the instantaneous vibration energy and three-dimensional energy spectrum of blasting vibration signal are analyzed. The attenuation of energy is basically the same as that of particle The attenuation of peak vibration velocity is consistent, which shows that the monitoring platform for blasting vibration monitoring in weak broken rock mass is an effective method to accurately capture the vibration data. It can be seen from the comparative test that the effect of making concrete cap on soft rock is obviously better than that without any treatment.