基坑上跨既有地铁隧道施工扰动效应研究  

Study on Disturbance Effect Caused by Excavation of Foundation Pit Across Existing Subway Tunnel

作　　者：郑刚强[1] 殷洪波[1] 郭永发[1] 刘正初[1] ZHENG Gang-qiang;YIN Hong-bo;GUO Yong-fa;LIU Zheng-chu(Kunming Survey,Design and Research Institute Co.Ltd.ofCREEC,Kunming 650200,China)

机构地区：[1]中铁二院昆明勘察设计研究院有限责任公司,昆明650200

出　　处：《工程建设与设计》2022年第1期114-117,共4页Construction & Design for Engineering

基　　金：云南省科技计划项目(2018BC008)。

摘　　要：为了探究基坑上跨既有地铁隧道施工过程中基坑结构、地表和既有隧道的变形规律,以某过江通道上跨既有地铁隧道为工程背景,运用FLAC 3D软件建立三维数值分析模型,对基坑施工进行动态模拟。结果表明:基坑上跨既有地铁隧道施工完成后,隧道整体产生隆起变形,尤其是在隧道拱顶部位,最大隆起量达到19.72 mm;地表沉降值处于沉降安全范围以内,但在距基坑3~4 m位置处,最大沉降值达到16.47 mm。研究成果可为工程实践提供理论支撑和技术指导。In order to explore the deformation law of the foundation pit structure, the surface and the existing tunnel in the construction process of the existing subway tunnel across the foundation pit, taking the existing subway tunnel across the river passage as the engineering background,the numerical analysis model is established by using FLAC3 D software, and the foundation pit construction is dynamically simulated. The results show that after the construction of the existing subway tunnel over the foundation pit is completed, the overall uplift deformation of the tunnel occurs, especially the maximum uplift amount of the tunnel vault reaches 19.72 mm. The surface settlement value is basically within the safe settlement range, but the maximum settlement value reaches 16.47 mm at the position 3 ~ 4 m from the ground connecting wall.

关 键 词：基坑工程 地铁隧道 地表沉降 变形规律 

分 类 号：TU753.1[建筑科学—建筑技术科学]