隧道掘进爆破引起地表震动的数值模拟与现场监测分析

在建立隧道掘进爆破的震动模型的基础上,采用有限元方法对人和场隧道掘进爆破引起的地表震动进行数值模拟,并将数值计算结果与现场监测结果进行比较分析。结果表明:采用数值计算方法获得的震动速度时程曲线形式比现场震动速度监测波形简单得多,两者明显不同;但通过数值计算所获得的地表震动速度峰值的变化规律及特征与现场监测结果基本一致,而且地表震动速度峰值计算结果与实测结果之间吻合较好,可见采用数值模拟方法来分析地表震动速度在工程应用上是可行的。

Numerical Simulation and Field Monitoring Analysis on Surface Vibration Resulted from Tunnel Driving Blasting

Based on the vibration model building of tunnel driving blasting,the surface vibration of Renhechang Tunnel resulted from driving blasting was simulated by using FEM.The comparisons of numerical calculation and field monitoring results show that the time-history curve of vibration velocity by numerical simulation is more simply than the field monitoring vibration velocity wave shape.The change law and character of peak vibration velocity of surface are close to the field monitoring results.Results induced to the two methods are obviously different.The comparisons also show good coincidence between the peak vibration velocities of surface by numerical calculation and the results by field monitoring.Analyzing the surface vibration velocity by numerical simulation method is available in engineering application.