同水平面地铁隧道与既有人防隧道相交段施工影响分析

哈尔滨市轨道交通1号线地铁隧道与既有人防隧道位置冲突，地铁隧道在同一水平面垂直穿越既有人防隧道时存在安全隐患。结合工程实际，对相交段隧道土体变形情况进行数值模拟。与单线地铁隧道开挖相比，相交段的地表及拱顶沉降均有所增大。由于相交段施工，其受影响的土体区域远大于隧道直径。通过既有人防隧道预加固处理，模拟结果与施工监测数据均显示地层变形得到了有效控制，保证了安全。

Analysis on Construction Influence at Intersection of Subway Tunnel and Existing Air-defense Tunnel in Same Horizontal Plane

The position of the subway tunnel on Rail Transit Line 1 in Haerbin City perpendicularly crosses and interferes with the existing air-defense tunnel in the same horizontal plane, bringing about potential safety hazard. Combining with engineering practice, numerical simulation was conducted in relation to the deformation of the soil mass around the tunnel intersection, through which it was obtained that, compared to the excavation of single subway tunnel, the settlement of both ground surface and tunnel vault within the tunnel intersection was relatively increased. As a result, the influenced area of soil mass was far more than the diameter range of tunnel. However, the pre reinforcement of the air-defense tunnel, in respect of which both the simulation result and the construction monitoring data show that the stratum deformation was effectively controlled, guarantees the safety.