基坑支撑爆破震动对相邻地铁隧道的影响

为研究基坑支撑爆破对相邻地铁隧道的影响，运用动力有限元法建立包括确定爆破激振力的作用位置、大小和时程特征等爆破加载模型．采用ABAQUS软件分别就不同的围岩类型、不同的基坑与地铁隧道间距，在受相邻基坑支撑爆破震动下的隧道振动进行非线性分析，结果表明：基坑支撑爆破拆除产生的振动对隧道衬砌迎爆面的边墙影响最大；隧道衬砌的振速随着间距的增大而减小；围岩振动速度与基坑和隧道之间的距离呈非线性关系，与围岩类型和爆破条件有关；围岩稳定性对振动波的阻尼效应明显；三角形爆破载荷达到峰值时，隧道响应达到峰值的时间有一定滞后，围岩越稳定，滞后时间越长；爆破载荷卸载后，隧道产生的自由振动与围岩类型有关，围岩越稳定衰减得越快．

Vibration influence on adjacent subway tunnel excited by blasting of brace system of foundation pit

To study the vibration influence on adjacent subway tunnel excited by blasting of brace system of foundation pit,a blasting model is established by dynamic finite element method,which includes the location,magnitude and time history properties of blasting force.Nonlinear analysis on subway tunnel vibration excited by blasting of brace system of adjacent foundation pit is done under the conditions such as different surrounding rocks,different spacing between foundation pit and tunnel,and so on.The analysis s...