喀斯特地貌区超浅埋拱盖法暗挖车站主体与附属结构接口优化设计  

Optimal Design of Interface Between Main Body and Subsidiary Structure of Super⁃Shallow Buried Underground Excavation Station with Arch⁃Cover Method in Karst Landform

作　　者：齐少轩 王非 朱培 王安东[1] QI Shaoxuan;WANG Fei;ZHU Pei;WANG Andong(China Railway Eryuan Engineering Group Co.Ltd.,Chengdu 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道建筑》2020年第6期73-77,共5页Railway Engineering

基　　金：国家自然科学基金(51378435);中铁二院工程集团有限责任公司科研项目(ZTCZ-工-KJKF-2015-02,KYY2020029(20-23)。

摘　　要：为降低喀斯特地貌区上软下硬地层超浅埋拱盖法车站主体与附属结构接口处的开挖风险,依托贵阳2号线油榨街暗挖车站,基于土力学及结构设计基本原理,应用有限元法建立地层-结构静力计算模型,分析了接口优化前后红黏土地表沉降规律以及接口处变形和受力,并结合现场监测数据验证优化方案的可行性。结果表明:红黏土地层暗挖接口的地表沉降规律符合Peck公式;采用弧形拱顶+直墙+仰拱+拱盖接口时,初期支护阶段接口变形及地面沉降相较传统接口减少56%~64%,增加拱盖环框梁后最终变形量减小61%~83%,二次衬砌厚度减少50%~54%,配筋减少6%~25%。In order to reduce the excavation risk at the interface between the main body and subsidiary structure of the super-shallow buried station with arch-cover method in the upper soft and lower hard stratum of karst landform,this paper used the finite element method to establish a stratum-structure static numerical model of the underground excavation station of the Youzha Street of Guiyang Line 2 based on the basic principles of soil mechanics and structural design.The surface subsidence laws of the red clay soil before and after interface optimization,as well as the deformation and stress at the interface,were analyzed,and the feasibility of the optimization scheme was verified by combining the field monitoring data.The results show that the surface subsidence law of the underground excavation interface in the red clay layer accords with Peck formula.When the combination of the arc arch,straight sidewall,invert and arch cover interface is used,compared with the traditional interface,the interface deformation and surface subsidence at the initial support stage are reduced by 56%~64%.After adding the arch cover ring frame beam,the final deformation is reduced by 61%~83%,the thickness of the secondary lining is reduced by 50%~54%,and the reinforcement is reduced by 6%~25%.

关 键 词：地铁 接口设计 数值模拟 暗挖车站 拱盖法 喀斯特地层 超浅埋 

分 类 号：U231.3[交通运输工程—道路与铁道工程]