地下结构及其围岩爆破地震效应

基于地下结构及其围岩的爆破震动监测,通过峰值质点振动速度及其主振动频率分析,阐述了围岩介质体中爆破地震波的传播规律,以及地下结构与围岩爆破地震效应;并就爆破震动观测结果进行了分析探讨。文中给出了比例药量与距离条件下的峰值质点振动速度衰减经验公式,分析了它们之间的关系,结果显示爆破近区的爆破地震波衰减速度要明显大于较远区域,爆破引起的质点振动速度主频集中在15~75Hz,以45Hz最为集中。峰值质点振动速度及其主频与爆破规模与爆心距密切相关,爆破地震波的衰减受传播介质体本身的物理几何特性影响很大。

BLASTING SEISMIC EFFECTS OF UNDERGROUND STRUCTURE AND COUNTRY ROCK

Based on the monitoring of blasting vibration,the propagation of blasting seismic wave in country rock and underground structure was discussed together with the analysis of the monitoring results of blasting vibration by analyzing the peak particle velocity(PPV) and its main frequency.The attenuation formula of the maximum PPV under charging proportion to the distance between blasting center and monitoring position was established,and correlation between them was analyzed.The analysis revealed that the maximum PPV attenuation velocity was more greater in near area than that in the relative far area,the main frequency was focused on 15～75Hz,especially on 45Hz.The conclusion could be reached that the PPV and its main frequency had close relation with charge and distance between blasting center and monitoring position,and attenuation of the blasting seismic waves related mainly with the geometry characteristics of propagation media mass.