深大基坑施工对紧邻地铁盾构区间影响的分析  

Impact of a Large Deep and Large Excavation on the Adjacent Subway Shielded Tunnel Section

作　　者：张红章 范卫琴 谢昭宇 熊宗海 谢武军 ZHANG Hongzhang;FAN Weiqin;XIE Zhaoyu;XIONG Zonghai;XIE Wujun(Wuhan Fengda Geological Engineering Co.Ltd.,Wuhan 430074;Wuchang University of Technology,Wuhan 430223;Hubei Daoze Survey and Design Institute Co.Ltd.,Wuhan 430074;China University of Geosciences,Wuhan 430074)

机构地区：[1]武汉丰达地质工程有限公司,武汉430074 [2]武昌理工学院,武汉430223 [3]湖北道泽勘测设计院有限公司,武汉430074 [4]中国地质大学(武汉),武汉430074

出　　处：《土工基础》2025年第1期29-34,共6页Soil Engineering and Foundation

摘　　要：某深大基坑紧邻规划地铁区间,采用排桩+桩外双排水泥搅拌桩进行支护。应用MIDAS/GTS NX分别对基坑开挖对地铁区间的影响及地铁区间施工对已建建筑结构的影响进行数值分析,计算得出:当地铁区间施工完成后再实施拟建项目时,地铁区间结构向基坑方向发生的最大水平位移为8.8 mm,最大沉降为6.6 mm;当拟建项目完成后再实施地铁区间时,隧道施工引起基坑支护结构及地表变形均很小。两种情况下结构均安全,但第一种情况下地铁结构位移接近预警值,为减小基坑开挖对地铁结构的影响,基坑开挖必须先于轨道交通线区间结构施工,否则应更换支护方式。基坑施工前可采用数值计算对基坑支护与紧邻地铁盾构区间之间的影响进行分析,以此评估设计及施工方案的合理性,达到事前预控的目的。A deep excavation is adjacent to the planned subway section and is supported by soldier piles and double row cement mixing columns outside the soldier piles.By using MIDAS/GTS NX,the numerical analysis was conducted to study the impact of the deep excavation on subway sections and the impact of the subway section construction on existing building structures.The analytical results indicated that,when the proposed project is started after the completion of the subway section construc-tion,the maximum horizontal displacement of the subway section structure towards the deep excavation direction is 8.8mm and the maximum settlement is 6.6mm;When the proposed project is completed before the subway section,the tunnel construction causes minimal deformation of the deep excavation support structure and surface.In both cases,the tunnel structure is safe,but in the first case,the displacement of the subway structure is close to the warning threshold value.To reduce the impact of the excavation on the subway structure,the excavation of the foundation must be constructed before the interval structure of the rail transit line construction,otherwise the supporting method should be changed.Before the construction of the deep exca-vation,numerical simulations can be used to analyze the impact between the deep excavation support and the adjacent subway shield interval,in order to evaluate the adequacy of the design and construction plan.

关 键 词：深大基坑 数值分析 地铁区间 位移 

分 类 号：TU443[建筑科学—岩土工程]