浅埋暗挖隧道下穿综合管廊施工技术研究

Research on construction technology of shallow-buried excavation tunnel undercrossing utility tunnel

近年来城市地下工程不断发展,地铁隧道开挖过程中受地质条件以及周边环境的影响,施工事故常发生。以佛山市某下挖隧道暗穿综合管廊DK18+416~DK18+426.8段为背景,对隧道在淤泥质粉质黏土以及粗砂地层中近距离下穿综合管廊时,为控制管廊沉降,保障施工安全采取的施工措施进行介绍,包括施工参数、施工工艺、施工部署、加固技术、监测技术等。根据监测数据显示,采用"地表垂直加固+水平旋喷超前加固+管廊底部超前注浆"方案,不仅可以保护管廊,还能有效控制沉降,保障施工安全。

In recent years,urban underground engineering has been developing constantly.In the process of subway tunnel excavation,construction accidents often occur due to the influence of geological conditions and surrounding environment.Taking the DK18+416~DK18+426.8 section of the underground tunnel through the utility tunnel in Foshan as the background,this paper introduces the construction measures taken to control the settlement of the pipe gallery and ensure the safety of construction when the tunnel undercrossing the utility tunnel at a close distance in the muddy silty clay and coarse sand.These measures are including construction parameters,construction technology,construction deployment,and reinforcement technology,and monitoring technology,etc.According to the monitoring data,the"surface vertical reinforcement+preceding reinforcement of horizontal rotary jet grouting+preceding grouting at the bottom of the utility tunnel"scheme can not only protect the utility tunnel,but also effectively control the settlement and ensure the safety.