【摘要】 以厦门市东通道翔安海底隧道为研究对象,基于现场爆破振动实测结果,结合ANSYS/LS-DYNA软件的三维数值模拟分析,研究了海底隧道钻爆开挖掌子面前后及拱顶岩石质点振动场规律。全面测试了海底隧道钻爆开挖过程中振动场特征和隧道径向和轴向爆破振动速度的衰减规律。结果表明:隧道钻爆开挖形成的振动场具有拱顶最强、掌子面后方次之、掌子面前方最弱的典型条形药包的振动场规律。Ⅱ级围岩爆破每循环进尺2m~4m时,爆破损伤范围为0.5~1.5m,Ⅴ级围岩每循环进尺1.5~3m时,爆破损伤范围为1~2m。建议Ⅱ级围岩隧道每循环进尺3m~4m,Ⅴ级围岩隧道每循环进尺1.5~2.0m。更多还原

【Abstract】 Taking Xiamen Xiangan subsea tunnel as the research object, based on the measured results of blasting vibration and Numerical simulation analysis by ANSYS/LS-DYNA, attenuation law of vibration in the zone of tunnel vault and pre-and-post of tunnel face were researched. In the field test, law of vibration in the radial direction and axial direction of the tunnel were tested system. It is proved that the vibration field formed with drill and blast excavation followed the typical vibration rule of single linear charge that vibration in the radial direction was strongest, which in the back of tunnel face takes second place, and in the front of the tunnel face was at least. And Blasting damage zone was about 0.5~1.5m in the footage of 2~4m in grade II surrounding rock-mass, blasting damage zone was 1~2m in the footage of 1.5~3m in grade V surrounding rock-mass. Each cycle footage was suggested about 3~4m and 1.5~2.0m in grade II and grade V surrounding rock-mass.更多还原