基坑爆破开挖对运营隧道的影响数值模拟分析

Numerical Simulation Analysis on Influence of Foundation Pit Blasting Excavation on Operating Tunnel

以深圳安托山安峦公馆基坑爆破开挖工程为研究对象,采用数值模拟方法分析了爆破振动传播途径中距离爆源不同距离处的振动速度,以及大断面、小断面隧道衬砌振动速度的分布情况。结果表明:在距离地铁40 m以内爆破施工时应采取减震措施;地铁隧道迎爆侧的水平和竖向振动速度要大于非迎爆侧,隧道衬砌最大振动速度在迎爆侧拱顶和拱脚,爆破施工过程中应对隧道迎爆侧重点监测和防护;隧道断面对水平和竖向振动速度均有放大作用。

Taking the foundation pit blasting excavation engineering of Shenzhen An-tuo-shan-an-luan mansion as the research background,the numerical simulation method was used to analyze the vibration velocity at different distances from the blast source in the transmission process of blasting vibration and the vibration velocity distribution oflarge and small section tunnel lining. The results indicate vibration attenuation measures should be taken in the blasting construction within 40 m from the subway,the horizontal and vertical vibration velocity on the blasting side of subway tunnel is greater than that on the non-blasting side,the maximum vibration velocity of tunnel lining is at the vault and arch foot on the blasting side,the key monitoring and protection should be made for blasting side of the tunnel during the blasting construction,and the tunnel section has an amplification effect on horizontal and vertical vibration velocity.