地下洞室及其围岩爆破地震安全监测与动力分析

基于地下洞室及其围岩的爆破震动安全监测,通过质点振动速度峰值及其卓越频率分析,论述爆破地震波的传播规律以及地下洞室与围岩爆破地震作用下的动力特性,并对爆破地震安全监测与分析结果进行解释与原因探讨。通过大量监测数据的回归分析,得出质点振动速度峰值与爆破药量和距离及环境条件的关系式,并在分析三者关系的基础上指出,近爆破点区域的爆破地震波衰减速度明显大于较远区域,爆破引起的质点振动速度峰值的卓越频率集中在以45Hz为中心的15~75Hz范围值。质点振动速度峰值及其卓越频率与爆破规模与环境的几何因素密切相关,介质本身的物理几何特性是爆破地震波衰减的主要影响因素之一。

Blasting Seismic Safety Monitoring and Dynamic Analysis of Chamber of Underground Pit and Its Surrounding Rock

Based on blasting seismic safety monitoring and frequency and amplitude analysis of the peak particle velocity (PPV) of chamber of underground pit and its surrounding rock,the law of blasting seismic waves propagation in surrounding rock and the dynamic characteristics of chamber of underground pit and its surrounding rock are described.The results of blasting seismic safety monitoring effects of chamber of underground pit and its surrounding rock are discussed and explored. The attenuation formula of the PPV conditioned with explosives and distance between blasting center and monitoring position is shown.The relationship between the PPV and ratio charge of blasting vibration is pointed out,which shows that the PPV attenuates more rapidly in near area than in further area, and the principal frequency focuses on 15～75Hz especially 45Hz, and that correlation between the PPV and its principal frequency and charge and distance between blasting center and monitoring position is more high.The decaying of the blasting seismic waves related mainly with the neutrality and characteristics of propagation media mass.