【摘要】 为避免公路隧道爆破施工影响邻近铁路隧道的结构稳定性,在铁路隧道内部安置爆破振动测试仪对爆破振动信号进行检测。使用HHT(希尔伯特黄变换)方法对爆破振动信号的希尔伯特谱、三维能量谱、瞬时能量谱进行分析。结果表明:爆破振动信号频谱特征受多因素综合影响,结合场地岩石性质、起爆药量、距爆源距离等参数进行研究,爆破振动信号主要能量分布频带在10～60Hz之间,避开了铁路隧道自振频率,可以有效地降低爆破振动对铁路隧道的不利影响。HHT方法能够很好地分析隧道爆破对临近建(构)筑物振动安全影响的大小,利于指导施工。更多还原

【Abstract】 To avoid the risk of a highway tunnel blasting construction impact on a nearby dilapidated railway tunnel,a blasting vibration tester was set up in the railway tunnel to detect the blasting and vibration signals.HHT was used to analyze the Hilbert spectrum,the three-dimensional power spectrum,and instantaneous energy spectrum of the blasting signals.The result shows that several factors affect the blasting vibration signal spectrum.Based on parameters analysis including the rock characters,the initiatial charge amount and the distance to the blasting resource,blasting vibration signal energy distribution is confirmed in the frequency range of 10Hz-60Hz,which is out of the inherent frequency of the railway tunnel and may effectively reduce the adverse impact on the railway tunnel.HHT can analyse whether the blast will destroy the railway tunnel,which can provide appropriate guidance to the construction work.更多还原