摘要
利用基于功率谱的爆破地震能量分析方法,针对向家坝隧洞掘进爆破和下部梯段爆破的地震能量分布特征进行了研究,并与天然地震的能量特征进行了对比,分析结果表明:地下厂房开挖爆破地震能量分布对应频带宽度达到了200 Hz以上,100 Hz以上的能量成分占了超过85%,小于40 Hz的能量比例非常小,而天然地震的所有能量均分布在5 Hz以内的频段内。在地下厂房开挖爆破振动影响分析计算中,不论在荷载,还是在计算方法的选取上,都应注意到爆破地震与天然地震在能量分布特征上的这种差别。
Utilizing the energy analysis method of blasting vibration signals based on power spectrum,the energy distribution characteristics of seismic waves induced by tunnd blasting and bench blasting in Xiangjiaba underground powerhouse were studied, and were compared with of the earthquake wave. The resuhs show that for blasting vibration in the underground powerhouse,the frequency bandwidth of energy distribution is overpass 200 Hz,and the rate of energy component over 100 Hz accounts for more than 85 percent, the rate of energy lower than 40 Hz is much less. For the earthquake, the frequency band of energy distribution is focused on from 0 Hz to 5 Hz. For analyzing and calculating the blasting vibration of underground powerhouse excavation ,the diffrence of energy distribution characteristic between blasting vibration and earthquake no matter of loading or chosing the calculation method.
出处
《爆破》
CSCD
北大核心
2010年第2期5-9,13,共6页
Blasting
基金
教育部博士点新教师基金(200806101039)
四川省科技支撑计划(2008SZ0232)
四川大学青年科学基金(校青2008042)
关键词
爆破地震
能量
地下厂房
开挖
爆破
blasting vibration
energy distribution
underground powerhouse
excavation
blasting
