隧洞开挖爆破对地表振动速度影响的数值模拟分析

Numerical Simulation Analysis on the Influence from Excavation and Blasting of Tunnel to Vibration Velocity of Surface

采用有限元数值模拟对地下隧洞爆破进行模拟,并与实测数据进行对比,测试结果与数值模拟振动速度峰值结果基本吻合。根据单元峰值有效应力进行回归分析,得出基本遵循负幂指数的衰减规律,且数值模拟能够揭示起爆药量和爆心距的关系。研究结果对爆破施工有一定的指导意义。

Simulation was done on underground tunnel blasting by finite element numerical simulation,and comparison and analysis were done with measured data,test resuct was coincidence with result of vibration speed peak and vibration speed by numerical simulation.Regression analysis was done based on unit peak effective stress,attenuation law follow the negative power index law basically was obtained.Numerical simulation could reveal the relationship between initiation dosage and blast center distance,and estimate the blasting vibration speed situation of to be protected position.Research result has certain guiding significance to blasting construction.