大面积开洞盾构井结构力学特性分析  

Analysis of Mechanical Characteristics of Large-area Open Shield Well

作　　者：胡日成 HU Richeng(Guangzhou Metro Design and Research Institute Co.,Ltd.,Guangzhou 510010,China)

机构地区：[1]广州地铁设计研究院股份有限公司,广州510010

出　　处：《广东土木与建筑》2024年第12期73-76,共4页Guangdong Architecture Civil Engineering

摘　　要：为满足地铁盾构施工要求,盾构工作井需对各层板大面积开洞,导致工作井两阶段(阶段Ⅰ:施工阶段,阶段Ⅱ:使用阶段)受力存在显著差异。文章依托实际工程案列,分析了盾构井结构两阶段受力及变形特点,得出以下结论供设计参考:①施工阶段环框梁对侧墙约束刚度较弱,侧墙受力较大,其配筋由阶段Ⅰ控制;②阶段Ⅰ侧墙为双向板,需加强板双向配筋,且中板位置侧墙竖向内侧受拉,建议竖向内侧钢筋通长布置;③端墙开洞会减小结构受荷面积,导致端墙受力显著减小。In order to meet the requirements of metro shield construction,the shield well needs to open a large area of each layer plate,resulting in a significant difference in the stress of the two stages of the working well(stage I:construction stage,stage II:use stage).Based on the actual engineering case,analyzes the two-stage force and deformation characteristics of the shield shaft structure,and obtains the following conclusions for design reference:①In the construction stage,the constraint stiffness of the ring frame beam to the side wall is weak,and the side wall is stressed greatly,and its reinforcement is controlled by stage I;②stage I the side wall is a twoway slab,the two-way reinforcement of the slab needs to be reinforced,and the side wall at the middle plate position is tensile vertically inward,and it is recommended that the vertical inboard reinforcement be arranged through length;③The opening of the end wall will reduce the load area of the structure,resulting in a significant reduction of the stress on the end wall.

关 键 词：盾构井 大面积开洞 侧墙 数值模拟 受力分析 

分 类 号：U45[建筑科学—桥梁与隧道工程]