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随着轨道交通工程的快速发展和城市交通导改的要求限制,在城市繁华地带、主要道路下方,暗挖施工成为一个必要的选择。但因施工中场地环境、地下管线错综复杂,如何防止施工过程中土方坍塌并有效控制地表和管线沉降是城市浅埋暗挖工程施工中经常遇到的难题之一。地铁九号线丰台东大街站2号风道位于砂卵石层中,覆跨比达到1:2.6。本工程的中洞法施工在无水砂卵石超浅覆土中的施工经验和监控量测信息反馈机制,可为今后类似的工程施工提供借鉴指导。
With the rapid development of rail transit projects and the restrictions on the demand for urban traffic guidance, underground excavation has become a necessary choice in the bustling urban areas and under major roads. However, due to the complexity of site environment and underground pipelines in construction, how to prevent the earthwork from collapsing and effectively control the settlement of surface and pipeline during the construction is one of the most frequently encountered problems in the construction of urban shallow-buried excavation. Subway Line No. 9 Fengtai East Street Station on the 2nd channel is located in sand and gravel layer, span ratio of 1: 2.6. The construction experience and monitoring information feedback mechanism of the middle hole method construction of the project in the ultra-shallow casing of the water-free sand, pebble and sandstone can provide reference guidance for similar projects in the future.