地铁车站多跨一次扣拱暗挖逆作法施工及工序优化研究  

STUDY ON MULTI-SPAN TOP-DOWN BORED EXCAVATION WITH CAST-IN-SITU ARCH FOR UNDERGROUND CONSTRUCTION OF SUBWAY STATION AND PROCESS OPTIMIZATION

作　　者：黄耀飞 HUANG Yao-fei(The Third Engineering Co.,Ltd.,of the China Railway 18th Bureau Group,072750,Zhuozhou,Hebei,China)

机构地区：[1]中铁十八局集团第三工程有限公司,河北涿州072750

出　　处：《建筑技术》2024年第22期2749-2751,共3页Architecture Technology

摘　　要：大跨暗挖车站施工方法对施工安全至关重要,本研究依托长春市城市轨道交通7号线东南湖大路站工程项目,采用FLAC 3D软件对地铁车站一次扣拱暗挖逆作法施工全过程进行数值模拟分析,以地表沉降为控制指标,对导洞的施工工序进行优化。结果表明:导洞开挖是整个施工过程的关键步骤,其产生的拱顶沉降和地表沉降均占比总沉降值70%以上;不同导洞施工工序引起的地表沉降总量不同,最优导洞施工工序为先后依次开挖上、下导洞内外侧,后开挖下导洞剩余中部。The construction method is crucial to the safety of long-span underground construction.Taking the Dongnanhu Dalu Station of the Urban Rail Transit Line 7 in Changchun as an example,the whole construction process of top-down bored excavation with cast-in-situ arches for underground construction of subway stations was numerically simulated and analyzed with FLAC 3D software.With the surface settlement as a control index,the pilot tunnel construction process was optimized.Results show that the pilot tunnel excavation is critical in the whole construction process,and its vault and surface settlement accounts for more than 70%of the total settlement;and the total surface settlement arising from different pilot tunnel construction processes varies.The optimal construction process consists of excavation of the inner and outer sides of upper and lower pilot tunnels and then the remaining middle part of lower pilot tunnels.

关 键 词：地铁车站 一次扣拱暗挖逆作法 FLAC 3D 施工工序优化 

分 类 号：TU74[建筑科学—建筑技术科学]