不同距离条件下爆破引起的质点振动频幅分析

论文基于隧道开挖施工爆破震动安全监测,通过质点振动速度峰值及其主振频率分析,论述了不同距离条件下爆破引起的质点振动频幅特性,较为详尽地解释与探讨了爆破震动测试结果,并在分析质点振动速度峰值与距离及环境条件关系的基础上,得出较远距离条件下(220 m～325 m)的质点振动速度峰值的主振频率集中在以35Hz为中心的25～45Hz范围值的结论,同时指出近爆破点区域的爆破地震波衰减速度明显大于较远区域,以及介质特性与距离是加速爆破地震波衰减的主要因素,分析结果也再次证实质点振动速度峰值及其主振频率与爆破规模和环境条件密切相关.

Amplitude-frequency Analysis of Particel Vibation with Blasting at Different Distance

Based on blasting seismic safety monitoring,the frequency and amplitude of road tunnel and its surrounding rock are described by analyzing the peak particle velocity(PPV) and its principal frequency.The reasons of the blasting seismic effects of underground opening and its surrounding rock are discussed.And the attenuation formula of the maximum PPV and explosives with the distance between blasting center and monitoring position is shown and that the relationship between PPV and ratio charge blasting vibration is pointed out too.The results show that the maximum PPV attenuation velocity is more in near area than that at the farther,and the main frequency focuses in the range of 25~45Hz,especially at the point of 35Hz,that the PPV and its main frequency have close relation with charge and the distance between blasting center and monitoring position.The decaying of the blasting seismic waves related mainly to the neutrality and characteristics of propagation media mass.