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摘要: 基于现场实测爆破振动数据,采用小波分析技术对爆破振动信号的能量特征进行分析,得到了信号不同频带上的能量分布,根据受控结构体对爆破振动动态响应特征,探索建立了能考虑爆破振动的强度、频率和持续时间以及受控建(构)筑物本身的动态响应特性(固有频率和阻尼比)等因素的综合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。响应能量判据能准确地描述爆破振动对受控建(构)筑物的影响程度,较现行的速度-频率安全判据,更能全面地反映爆破振动对建(构)筑物危害的本质。Abstract: According to the existing blasting vibration live data, the different-frequency-band energy distribution of the blasting vibration signals was attained by the wavelet analysis technology. Based on the characteristics of dynamic response from the controlled structures by blasting vibration, a multi-factor blasting vibration safety criterion was proposed, also called the response energy criterion, in which taking 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 into account. The feasibility of the proposed criterion was validated by the engineering examples. Results show that this response energy criterion can describe accurately the effect degree of blasting vibration on the controlled structures, and that it can reflect the essence of blasting vibration damage to the structures more comprehensively than the actual velocity-frequency safety criterion.
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