【摘要】 近区工程爆破将对周围建(构)筑物产生不利影响,而爆破振动的破坏作用又与振动强度、频率以及结构自身的振动特性等综合因素有关.利用连续S变换对某浆砌块石单曲拱坝的坝基爆破振动速度信号进行分析,提取X、Y、Z三个方向速度信号的时频分布特征.结果表明S变换对爆破振动信号有较好的时频分辨率.最后采用质点峰值振动速度、瞬时能量谱和持续时间等指标对坝体的安全性进行评价,认为该大坝处于安全状态.更多还原

【Abstract】 Construction- induced vibration may produce potential damage to the surrounding infrastructure,and comprehensive factors( e. g.,vibration magnitude,frequency,duration,and structural characteristics) affect the damage. Bedrock vibration velocity recordings of a stone masonry arch dam caused by blasting are analyzed using the continuous S transform.Time- frequency characteristic of the recordings in three directions( i. e.,X- Y- Z) is extracted. The results show that the S transform has a high time- frequency resolution in processing blasting vibration signal. Finally,peak particle velocity,instantaneous energy spectrum,and blasting duration are adopted to evaluate the safety of the dam. It is concluded that the dam is safe.更多还原