浅埋暗挖车站施工对周边建筑等环境变形的控制

Environmental Deformation Control of Surrounding Buildings Induced by Shallow Embedded Station Construction

为了研究城市复杂地质条件下的暗挖车站结构设计及施工对上部结构等周边环境的影响,以徐州地铁1号线车站为工程背景,通过数值模拟计算CRD工法施工过程引起的隧道及地表沉降变形,同时基于隧道拱顶以及上部地表竖向位移监测数据,分析影响地表沉降因素,结果表明:当隧道开挖下穿已有上覆建筑结构时,上覆结构会明显抑制由隧道开挖引起的地表沉降量,约降低30%~50%;地表沉降达到稳定所需时间也有显著降低;在洞内采用CRD工法分断面施工以减小对周边环境的变形影响,暗法隧道施工采取适当措施能有效控制地层沉降,对上部建筑结构和周边地层影响可以控制在允许范围内。

In order to analyze the influence of the construction of the underground shallow embedded station on the surrounding environment in a complex geological conditions in urban area. This paper took Xuzhou Metro Line 1 station as the engineering background, the deformation of tunnel and surface settlement caused by the CRD construction process is calculated by numerical simulation. On the other hand, the factors affecting surface subsidence are analyzed based on the tunnel vault and the upper surface vertical displacement monitoring data. The results show that when shallow embedded tunnel beneath the existing building structure, the results show that the structure will significantly inhibit the amount of surface subsidence caused by tunnel excavation, which is reduced by about 30 to 50%. The CRD method is used in cross-section construction to reduce the influence on the surrounding environment. It took appropriate measures, the dark tunnel construction could effectively control the settlement, and the effects on the upper building structure and surrounding strata can be controlled within the allowable range.