救援通道施工爆破对已建高铁隧道的振动安全分析

为确保已建金山顶高铁隧道衬砌结构的安全,有必要在救援通道爆破施工过程中对其开展爆破振动监测。采用TC-4850N无线网络爆破测振仪进行监测,监测结果表明:既有隧道迎爆侧的衬砌结构断面振动最大;基于最小二乘法对监测数据进行回归分析并得到了爆破振动萨道夫斯基经验衰减公式参数;根据公式参数对后续爆破提出了爆破振动控制措施,做到当振动速度超过安全阀值时及时调整爆破参数,取得了较好的效果。

Analysis of Vibration Impact Caused by Relief Channel Blasting on Existing High-speed Railway Tunnel

To ensure the safety of the lining structure of the existing Jin Shan Ding high-speed railway tunnel,it is necessary to monitor blasting operation with TC-4850 N wireless blasting monitoring system.The results show that the lining structure section on the blasting side of the existing tunnel vibrates the most. The blasting vibration Sodev's empirical attenuation formula parameters are obtained based on the least squares regression analysis of the monitoring data. And blasting vibration control measures for subsequent blasting operations are proposed in the light of formula parameters so that blasting parameters are adjusted timely once the vibration velocity exceeds the allowable limit.