山地城市隧道开挖对既有建筑物的影响研究

发布时间：2018-05-13 20:15

本文选题：浅埋 + 大跨度双连拱隧道　；参考：《地下空间与工程学报》2017年S1期

【摘要】：城市浅埋暗挖隧道施工下穿既有建筑物的工程安全问题越来越受到重视。以重庆曾家岩嘉陵江大桥工程南侧主线隧道下穿、侧穿市政府办公楼,邻近戴笠公馆等建筑物为工程背景,通过FLAC3D建立了三维办公楼框架模型、三维地质地层模型和三维曲线连拱隧道模型,对双连拱隧道开挖过程中的邻近建筑物的变形规律及开挖后地表建筑物的变形和受力进行了分析。研究表明:下穿隧道开挖过程中,框架结构桩基的沉降变形值受距隧道轴线的距离及开挖步的影响较大,而水平变形值受开挖步的影响较大,受距隧道轴线距离的影响较小;隧道开挖将使框架结构底部地基梁的轴向力和弯矩发生较大变化,使桩的轴向力略微增加,弯矩略微变化。
[Abstract]:More and more attention has been paid to the engineering safety of shallow-buried tunnels under the construction of existing buildings. In the background of Chongqing Zengjiayanyan Jialing River Bridge Project, which runs through the main tunnel of the south side of the city government office building and adjacent to the Daili residence, a three-dimensional office building frame model is established through FLAC3D. In this paper, the deformation law of adjacent buildings in the excavation process of double-arch tunnel and the deformation and force of the surface buildings after excavation are analyzed by using the three-dimensional geological and stratigraphic model and the three-dimensional curved multi-arch tunnel model. The results show that the settlement deformation value of pile foundation of frame structure is greatly affected by the distance from the tunnel axis and the excavation step, while the horizontal deformation value is greatly affected by the excavation step, and the influence of the distance from the tunnel axis line to the settlement deformation value of the frame structure pile foundation is less. The excavation of the tunnel will change the axial force and bending moment of the foundation beam at the bottom of the frame structure, and make the axial force of the pile increase slightly and the bending moment change slightly.
【作者单位】：招商局重庆交通科研设计院有限公司;国家山区公路工程技术研究中心;公路隧道建设技术国家工程实验室;
【基金】：国家自然科学基金(41601574) 重庆市基础与前沿研究计划项目(cstc2014jcyj A30020)
【分类号】：U456.3

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