毗邻地铁隧道深基坑支护方案研究

摘要：北京市某深基坑工程毗邻正在运营的地铁10号线，距离地铁隧道衬砌管片最近距离5.0 m，为保证地铁的运营安全，要求由于基坑的开挖引起的轨道位移不超过3 mm。针对这些问题并根据拟建基坑工程本身特点和周围的环境及水文地质情况，深基坑支护选用上部为复合土钉墙，下部为地下连续墙支护。运用理正深基坑软件对地下连续墙的内力、位移、地表沉降计算，并对其进行了整体稳定性、抗倾覆和抗管涌验算。现场监测结果表明边坡位移量较小，地铁轨道位移控制在了3 mm以内，总方案经济合理、技术可行。

The supporting scheme design about a deep foundation pit adjacent to subway tunnel

Abstract: A deep foundation pit project of Beijing is adjacent to the operating metro line 10, the distance of a subway tunnel lining segment recently distance is 5.0 m, in order to ensure the safety of subway operation, orbit requirements caused by foundation pit excavation displacement is less than 3 mm. To solve these problems and according to the planned excavation engineering itself characteristics and the surrounding environment and hydrogeology condition, deep foundation pit supporting choose the upper for composite soil nail wall and lower as the underground continuous wall. Use li-zheng deep foundation pit software to calculate internal force and displacement of underground continuous wall, surface settlement, and carries on the overall stability, resistance to overturning and piping resistance calculation, calculation results conform to the requirements of the specification. The field monitoring results show that the slope displacement is small, the rail displacement control within 3 mm, the total scheme is reasonable in the economy and feasible in the technology.