【摘要】 运用基于功率谱的爆破地震能量分析方法,对九龙江北引二期改造工程隧洞掘进爆破的洞内和洞口邻近区域振动能量分布特征进行研究。结果表明:洞内振动能量分布极为分散,100 Hz以上的能量成分超过75%,而洞口邻近区域振动能量主要集中在主频附近频段内,100 Hz以下能量成分达到85%以上。认为对于30 Hz以下能量比例较大的爆破振动作用,现行峰值-主频安全判据有一定局限性,而以能量法为依据制定爆破振动安全判据和控制标准,应更合理。更多还原

【Abstract】 An energy analysis method for blasting vibration signals based on power spectrum was utilized,based on the measurement data from tunnel blasting of Jiulong-jiang second phase diversion project,the energy distribution characteristic inside and outside tunnel were studied.The results show that for inside tunnel the energy distribution is so scattered with frequency,over 75 percent energy ingredient is above 100 Hz;But for the area adjacent to opening,the vibration energy mainly concentrates the main frequency band,over 85 percent energy ingredient is below 100 Hz.Considering current peak velocity-main frequency safety standard has some limitations for the vibration signals which energy proportion is high below 30 Hz.While,a more reasonable safety criterion and control standards can be established by energy method.更多还原