岩体爆破地震波衰减规律的现场试验与分析
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摘要
通过6次现场岩体爆破试验,测量出与爆源不等距离处的36组地震波形。通过统计与频域分析发现:爆破地震波在爆源近区的衰减比中、远区要大得多;用萨道夫斯基经验公式估算出的爆源近区质点振速远大于实际值;爆破地震波的传播具有不可逆性;岩石质点振动主频率与药量、距离成反变关系;地震波作用时间与爆破药量成正变关系,而与距离成反变关系。
Through six blasting experiments, the 36 sets of seismic waveform at different positions away from the explosion sources are measured. Based on the analyses of both statistics and frequency, it is found that the attenuation of seismic waves in the near region away from the explosion source is more abrupt than that in the middle and far regions; the vibration velocities of rock particles in the near region given by the Sodev抯 empirical formula are much greater than their practical values; the propagation of seismic waves in rock masses possesses irreversibility; the vibration frequency varies inversely as both the charge weight and the distance away from the explosion source; the duration of seismic waves varies directly as the charge weight and inversely as the distance.
Through six blasting experiments, the 36 sets of seismic waveform at different positions away from the explosion sources are measured. Based on the analyses of both statistics and frequency, it is found that the attenuation of seismic waves in the near region away from the explosion source is more abrupt than that in the middle and far regions; the vibration velocities of rock particles in the near region given by the Sodev抯 empirical formula are much greater than their practical values; the propagation of seismic waves in rock masses possesses irreversibility; the vibration frequency varies inversely as both the charge weight and the distance away from the explosion source; the duration of seismic waves varies directly as the charge weight and inversely as the distance.
引文
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[2]魏晓林.开挖爆破对基坑喷锚网边坡动力稳定影响[J].爆破,1998,15(2):69-74.
[3]霍永基.建筑结构爆破地震动力反应分析法[C].第六届全国工程爆破学术会议论文集,深圳,1997.
[4]陈小波,王伟策.爆破振动测试的数值分析方法[J].爆破,1997,14(4):51-53.
[5]李宏男.爆破地震效应若干问题的探讨[J].爆炸与冲击,1996,16(1):61-67.
[6]林大超.浅地表双源微差爆破地震振动的试验研究[J].工程爆破,2000,6(4):1-5.
[7]刘加尧.临近即有线的新隧道开挖爆破减震技术[J].工程爆破,2000,6(2):78-81.
[8]郗庆桃.隧道爆破震动控制技术[J].爆破,1998,15(4):83-87.
[9]彭光耀.复杂环境下深孔爆破地震效应的控制技术[J].爆破,1997,14(4):41-43.
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