【摘要】 为评价在生产常规作业阶段爆破施工方式对隧道结构的影响,对宋家湾隧道爆破振动进行监测,以获取主振频率,最终以频率和振动速度2个指标评估隧道爆破作业振动效应。本次爆破的最大振动速度为3.1cm/s,主振频率范围为27.34～70.31Hz,最大振动速度远小于国家标准。可知对隧道支护结构影响有限频率范围为27.34～70.31Hz,远高于隧道的自振频率(一般在3～9Hz范围内),不会出现共振放大现象。更多还原

【Abstract】 Evaluating the influence of the blasting construction on the tunnel structure in conventional operation stage.Methods: monitoring the Songjiawan tunnel blasting vibration to obtain the main vibration frequency,ultimately evaluate the blasting vibration effect using frequency and vibration velocity.Results: The blasting of the maximum vibration velocity is 3.1 cm/s and the main frequency ranges from 27.34 Hz to 70.31 Hz.Conclusion: Maximum vibration velocity is far less than the national standard,the frequency range of 27.34 Hz to 70.31 Hz influencing the supporting structure,far above the tunnel vibration frequency(typically in the range of 3~9 Hz),and it won’t appear resonance amplification phenomenon.更多还原