【摘要】 以某工程隧道为例,基于FLAC3D软件对隧道爆破开挖引起的地表震动效应进行了数值模拟,得出在隧道爆破开挖影响区一定范围内已开挖区域地表质点震动速度是未开挖区域地表质点震动速度的2~5倍,且两者的衰减规律完全不一样。在距掌子面水平距离为5~25 m的范围内,隧道爆破开挖存在明显的空洞效应,若忽视爆破开挖空洞效应现象,则不能确保施工过程中爆破震动的安全性。更多还原

【Abstract】 With some tunnel project as an example,a numerical simulation with software FLAC3 Dwas performed for the surface vibration effect caused by the blasting in tunnel excavation. It is found that within the affected area by blasting excavation in the tunnel,the velocity of ground vibration in the excavated zone is 2 ~ 5 times of that in non-excavated zone,with completely different attenuation law for both. An obvious ground void effect will be caused by the blasting excavation in tunnel in the area 5 ~ 25 m in the horizontal distance away from the working face. Once ignored,the safety caused by the blasting vibration in the process of construction can not be assured.更多还原