【摘要】 基于现场实测爆破振动数据,采用小波包分析技术对爆破振动信号进行了时频特征分析。根据小波包变换的分层分解关系,推导出爆破振动信号不同频带的小波包频带能量,小波包频带能量能同时反映爆破振动3要素(振动的强度、频率和持续时间)的作用影响。基于小波包能量谱,获得了爆破振动信号不同频带能量的分布特征,根据受控结构体对爆破振动动态响应特性,首次建立了能考虑爆破振动3要素以及受控建(构)筑物本身的动态响应特性(固有频率和阻尼比)等因素综合的安全判据——响应能量判据,并用工程实例验证了该判据的可行性和可靠性。该判据较之现行的速度-频率安全判据来说,能准确地描述爆破振动对受控建(构)筑物的影响程度,更能全面地评估建(构)筑物爆破地震效应。更多还原

【Abstract】 According to blasting vibration live data that have been collected,the time-frequency characteristics analysis for blasting vibration signals has made by wavelet packet analysis technology.According to the multi-resolution decomposition of wavelet packet transform,the wavelet packet frequency band energy has been deduced on different bands of blasting vibration signals;and it can reflect the total influence of all the three key elements(intensity,frequency and duration of vibration) of blasting vibration.Energy distributions for different frequency bands of blasting vibration signals are obtained based on wavelet packet energy spectra.Based on the characteristics of dynamic response from the controlled structures by blasting vibration,it is firstly established that a multi-factors blasting vibration safety criterion called response energy criterion.The criterion can reflect the total influence of the intensity,frequency and duration of vibration and the characteristics(natural frequency and damping ratio) of dynamic response from the controlled structures themselves;and the feasibility and reliability of the criterion are validated by the instances.Compared with velocity-frequency safety criterion,this criterion can describe accurately the degree of effect on the controlled structures by blasting vibration,and evaluate more comprehensively blasting seismic effect on the structures.更多还原