新建隧道正交下穿施工对既有隧道的影响

Impact of Perpendicular Undercrossing Tunneling Construction on Existing Tunnel

为揭示新建隧道正交下穿施工对既有隧道结构安全及地表建筑物产生的影响,依托某新建地铁区间隧道工程,采用三维有限差分方法构建了新建隧道正交下穿既有隧道的三维数值计算模型,探讨了新建隧道正交下穿施工对地表沉降及既有隧道衬砌结构产生的影响,得出了地表横向、纵向沉降规律以及既有隧道衬砌结构变形、内力的变化规律。

In order to reveal the impact of the perpendicular undercrossing tunneling construction on the structural safety of the existing tunnel and surface buildings. Based on a new subway tunnel project, a three- dimensional finite difference method is used to construct the three-dimensional numerical model for the perpendicular undercrossing tunneling construction below existing tunnel. The influence of the new tunnel construction on surface settlement and tunnel lining structure is discussed to obtain crosswise and lengthways surface settlement law and the deformation and internal force change laws of existing tunnel lining structure.