盖挖逆作大跨地下四层车站板开孔应力集中的分析研究  

Analytical study on stress concentration in slab openings of a cover-cut reverse excavated large-span underground four-story station

作　　者：汪子豪 周丹 武卫星 WANG Zihao;ZHOU Dan;WU Weixing(Changjiang Institute of Survey,Planning,Design and Research,Wuhan Hubei 430010,China)

机构地区：[1]长江勘测规划设计研究有限责任公司,湖北武汉430010

出　　处：《现代城市轨道交通》2025年第4期26-31,共6页Modern Urban Transit

摘　　要：为研究盖挖逆作地下车站各层结构板在施工过程中的不利受力及变形情况,以武汉市长江一级阶地某深度为30.6 m、宽度为50.7 m的地下车站为工程背景,采用三维有限元模拟方法,重点分析盾构端结构板大面积开孔对大跨四层地下车站逆作基坑的结构受力和变形影响。在此基础上,进一步探究在常规盾构吊装孔尺寸条件下,于开孔角点处设置临时角撑、临时对撑等措施对优化结构受力状态与变形控制效果的有效性和工程实用性。研究结果表明,采取此类简单的临时支撑措施,可有效缓解孔周应力集中。该研究成果可为后续复杂地质条件下逆作车站结构设计提供参考和启示。To study the unfavorable force and deformation of the structural slabs in each layer of the cover-cut reverse excavated underground stations during the construction process,a three-dimensional finite element simulation method is adopted to focus on the analysis of the impact of large opening of the structural slabs at the shield end on structural force and deformation of the large-span,four-story reverse excavated pit of the underground station with a depth of 30 m and a width of 50 m located at a Yangtze River first-level terrace in Wuhan municipality as the engineering background.On this basis,the effectiveness and engineering practicability of measures such as setting corner braces and temporary buttresses at structural corners to optimize the structural stress and deformation control effect under the condition of conventional shield lifting hole size are further investigated.The research results show that such simple temporary support measures can effectively relieve the stress concentration around the hole.The research results provide reference and inspiration for the subsequent structural design of reverse excavated stations under complex geological conditions.

关 键 词：城市轨道交通 盖挖逆作法 有限元分析 大面积开孔 应力集中分析 

分 类 号：TU318[建筑科学—结构工程]