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基于隧道钻孔爆破时岩体的破坏过程及应力波传播特性,提出了能用于快速计算模拟爆破地震场的等效荷载施加方法。采用等效荷载施加方法对重庆双碑隧道浅埋段掘进爆破时的地表振动进行了数值计算,并将数值计算结果与现场实测振动数据对比分析,验证了该等效荷载施加方法用于模拟计算地表爆破振动特性的可行性。最后,通过计算浅埋小净距隧道两侧隧道掌子面处于不同位置关系时的地表振动情况,得到非主爆隧道开挖后形成的空洞区将对其上部的地表振动强度具有一定的放大作用,且放大倍数与该隧道掌子面同主爆隧道掌子面间的位置相关。
Based on the failure process of rock mass and the stress wave propagation characteristics of tunnel borehole blasting, a method of equivalent load application that can be used to quickly calculate the simulated blasting seismic field is proposed. Equivalent load applying method was used to calculate the surface vibration of tunnel during the blasting excavation in Shallow Buried Section of Chongqing Shuangbei Tunnel. Comparing the numerical results with the measured data, the equivalent load method was used to simulate the calculation Feasibility of Surface Blasting Vibration Characteristics. Finally, by calculating the surface vibration of the tunnel face at different positions of shallow tunnels with small clear distance, the void area formed after the excavation of the non-main blasting tunnel will enlarge the surface vibration intensity of the upper part of the tunnel, And the magnification is related to the position of the tunnel face and the face of the main blast tunnel.