浅埋暗挖隧道斜交上穿既有地铁数值模拟研究

Numerical simulation of new upcrossing shallow tunneling acting on the existing subway

采用ANSYS对浅埋暗挖法施工过程模拟,结果表明:开挖进尺对下方既有地铁结构位移(上浮)影响较大,应选择短台阶、小开挖进尺进行穿越。最大变形均处于隧道上穿地铁交叠处,横向变形趋势向着穿越工程前进的方向倾斜移动。

Using ANSYS to simulate the construction process of the shallow tunneling method, analyze subway tunnel structure deformation law when shallow- tunneling acting on it. The results show： the maxinmnl deformation show- in the overlap belween shallow tunneling and existing subway. The existing subway structure lateral deformation is not large, lateral deformation trend toward cross the excavation direction.