临近高架桥地铁基坑支护与开挖施工技术  

Construction techniques for supporting and excavating metro foundation pits near elevated bridges

作　　者：郭东生 GUO Dong-sheng

机构地区：[1]中铁十九局集团轨道交通工程有限公司,北京101300

出　　处：《建筑机械》2025年第2期148-153,M0003,共7页Construction Machinery

摘　　要：沈阳地铁1号线东延线工程的东大营街站基坑北侧紧邻东陵路高架桥,其车站基坑的支护与开挖施工面临较大风险。为解决该施工难点,文章借助FLAC3D软件对车站基坑进行三维建模与数值模拟计算,旨在提前为基坑支护体系的设计、开挖方案的选定及周边结构变形的监测提供科学依据。基于模拟计算结果,选择采用钻孔灌注桩+内支撑体系为基坑支护结构,以及明挖法+局部盖挖法为土方开挖的施工方法。为进一步验证这些措施的有效性,还利用有限元软件Plaxis对高架桥的地表沉降与墩台沉降进行了深入分析。结合计算结果与实际工程监测数据的综合研判,研究结果表明:在基坑开挖与支护过程中,高架桥桥桩的沉降变形均被严格控制在预设的安全范围内,充分证明现场所采取的基坑支护与开挖技术能够有效地控制高架桥桥桩的沉降,从而确保地铁施工安全。The East Dayingjie station of the eastern extension project of Shenyang Metro Line 1 is located right next to the Dongling road viaduct on the north side of the station's foundation pit.The construction of the station's foundation pit support and excavation faces significant risks.To address this construction challenge,this paper selects the bored pile and internal support system as the foundation pit support structure and the open cut excavation method and local top-down excavation method as the construction method for earthwork excavation.To further verify the effectiveness of these measures,the finite element software Plaxis is also used to conduct an in-depth analysis of the surface settlement of the viaduct and the settlement of the piers and abutments.

关 键 词：临近高架桥 开挖与支护 FLAC3D建模 Plaxis有限元 施工技术 

分 类 号：U455.56[建筑科学—桥梁与隧道工程]