砂卵石地层中浅埋暗挖出入口施工技术

CONSTRUCTION TECHNOLOGY OF SHALLOW-BURIED UNDERGROUND EXCAVATION ENTRANCE IN SANDY COBBLE STRATUM

地铁昌平线二期北邵洼车站出入口采用暗挖法施工,施工过程中存在大管棚角度偏差控制难度大、注浆效果差、小导管打设困难、开挖遇大直径漂石、地表沉降控制困难等问题,从环境调查、设计优化、施工控制、监控量测等施工全过程,讨论无水环境下松散砂卵石地层中浅埋暗挖法出入口的施工技术,为以后工程建设提供借鉴。

Entrance/exit of Beishaowa Station in Phase II Changping Line adopts the tunneling method and encounters high difficulty in angle deflection control of large pipe shed,poor grouting effects,difficulty in small duct laying,large-diameter boulder during excavation,difficulty in surface settlement control,and such difficulties during construction.This paper discusses the construction technology of shallow tunneling of entrance/exit in loose sand-pebble strata free from water,in terms of whole process including environmental survey,design optimization,construction control and monitoring survey etc.,so as to lay a foundation for future construction.