【摘要】 基于弹性介质中球状药包激发应力波的理论解及其频谱表达式,通过引入介质阻尼项,建立了球形药包爆破条件下实际岩体介质中爆破振动的频谱表达式,进而分析爆破振动频率的衰减机制和影响因素。分析表明:爆破振动频率的衰减与爆腔的大小、爆心距、岩体纵波速度和品质因子等因素密切相关。由于爆破地震波幅频分布曲线的多峰结构和高频爆破地震波衰减快的双重因素影响,爆破振动主频随爆心距的增大并非遵循严格的衰减,而在传播过程中会出现局部跳跃现象;爆破振动质心频率则呈现显著的衰减规律,其与岩体纵波速度与爆腔半径的比值成线性比例关系,与爆腔半径和爆心距的比值成幂函数关系。更多还原

【Abstract】 Based on the theoretical solution of stress wave and spectrum induced by spherical charge in elastic rock mass,by using a damping item in the spectrum solution,the spectrum solution induced by spherical charge in real rock mass was established to study the decay mechanism and corresponding influencing factors of blasting vibration frequency.Results show that the decay of blasting vibration frequency was closely related to the size of blasting cavity,distance to blast source,the longitudinally sonic velocity of rock mass and the quality factor.The dominant frequency of blasting vibration didn’t attenuate with the distance to blast source strictly,which just fluctuated in some distances because of the multimodal structures of vibration spectrum and higher decay rate for high-frequency component of vibration.The centroid frequency of blasting vibration observed remarkable decay law and linear to ratio of longitudinal velocity of rock to blast source radius,which was related with the ratio of blast source radius to distance away from blast source.更多还原