【摘要】 确定海底隧道的最小岩石覆盖厚度是在确保海底隧道安全的基础上减少工程造价的关键。施工爆破对上覆岩石的振动影响着海底隧道最小岩石覆盖厚度的确定。采用 FLAC^3D模拟了宁波海底隧道钻爆法施工对上覆岩层的动力学影响,分析了海底隧道的底板标高和装药量对上覆岩层交界面的稳定性影响,得到了振动速度、应力波动历时曲线和塑性区大小。通过与萨道夫斯基公式计算结果的对比,综合经济、安全方面的考虑,建议降低装药量,底板线下降2m。更多还原

【Abstract】 Ascertaining the minimum rock covers of subsea tunnel is important to reduce project cost on the conditions of subsea tunnel safety.Researching the dynamic influence of tunnel blasting construction on the cover rock mass is necessary to the minimum rock covers.The effect of subsea tunnel construction using drilling and blasting method to overlaying strata is analyzed through FLAC3D numerical simulation.The influence of different subsea tunnel level and charge weight on the interface of overlaying strata is analyzed.The blasting vibration velocity history and stress vibration history at key points and the plastic zone are gained and contrasted with the result of experimental formula;synthesizing the above analysis and considering economical and safety of subsea tunnel,we suggest that charge weight should be reduced and subsea tunnel level should be descended 2 meters.更多还原