地铁车站基坑和区间隧道近接施工对地面建筑物影响分析

Influence of Metro Station Excavating and Tunnel Crossing on Ground Building

沈阳地铁十号线滂江街站和滂江街站—长安路站区间(后面简称滂长区间)近接某老旧居民楼施工,车站基坑深约25 m,与该楼水平距离10.5 m,区间下穿该楼,竖向距离16 m。车站与区间施工对该建筑物进行多次扰动,形成叠加影响,该建筑物沉降变形风险较大。采用大型有限元软件ABAQUS对车站和区间的施工过程进行模拟分析,对该楼沉降进行预测,为风险工程保护措施提供参考依据。计算结果表明,左线盾构下穿施工引起该楼的沉降占总沉降的大部分,应重点加强左线盾构掘进过程的施工参数控制,确保建筑物沉降控制在允许范围之内。

An old residential building is just 10. 5 meters from the deep Pangjiang Street Station excavation of Shenyang Metro Line 10,and the section tunnel from Pangjiang Street Station to Changan Road station will cross though the ground building,their vertical distance is 16 meters. Under the cumulated influence of metro station excavating and tunnel crossing,the ground building has a great risk of subsidence and deformation. In order to predict the settlement of the building and provide the basis for taking effective protective measures,a large finite element software ABAQUS is adopted to simulate the construction process of the station and the tunnel. The calculation results show that the major settlement is caused by the left tunnel crossing,therefore we should focus on strengthening the shield tunneling process control of the left tunnel and ensure the building settlement in the allowed range.