小净距隧道爆破振动监测与分析

Blasting Vibration Monitoring and Analysis of Tunnel with Small Clear Space

以重庆寸滩小净距隧道开挖为工程依托,在隧道施工爆破过程中对邻近隧道进行爆破振动监测.应用萨道夫斯基经验公式对现场监控量测数据进行回归分析,确定爆破应力波在泥质砂岩中的传播衰减规律,控制不同间距情况下的最大段起爆药量,指导后续施工过程,保证邻近隧道振动速度控制在安全范围内.其研究对指导隧道工程施工爆破和保证安全起到了重要作用.

Based on project excavation of the CunTan tunnel in Chongqing, the blasting vi- bration was monitored by tunnel excavation because the CunTan tunnel is a tunnel with small clear space. The monitoring results of blasting vibration were studied via regression analysis by means of Sadaovsk empirical formula, the attenuation orderlines of spread of blasting vibration was established. The result of regression analysis determined the maxi- mum explosive charge of a segment in different distance, guided the subsequent process of tunnel excavation, assured the vibration velocity of adjoin tunnel within safety range in the process of this tunnel excavation. This study will play an important role in guiding the ex- cavation blasting construction of the tunnel project and assuring the safety of adjoin tunnel.