岩体爆破地震波衰减规律的现场试验与分析

Field Experiment and its Analyses of Attenuation Law for Seismic Waves Resulting from Rock Blasting

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.