新型管幕工法修建地铁车站地层变形特性及参数优化  

Ground Deformation Characteristics and Parameter Optimization of Metro Stations Constructed by Novel Pipe Roofing Method

作　　者：邱建 赵文[1] 路博 孙旭 QIU Jian;ZHAO Wen;LU Bo;SUN Xu(School of Resources&Civil Engineering,Northeastern University,Shenyang 110819,China;The Fourth Engineering Co.,Ltd.of China Railway Ninth Bureau Group,Shenyang 110000,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]中铁第九集团第四工程有限公司,辽宁沈阳110000

出　　处：《东北大学学报(自然科学版)》2024年第11期1645-1655,共11页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51878127)。

摘　　要：针对传统管幕工法承载力低及施工工序复杂等难题,提出了一种新型管幕工法—小直径管幕顶板工法,并应用于沈阳地铁和平南大街站工程.首先,参照实际工程构建了三维有限差分模型,对施工过程中地层变形特性进行研究;然后,阐明了管幕参数对车站施工结束后跨中最大地表沉降、管幕施工造成的地层扰动、管幕刚度以及造价4个指标的影响规律;最后,结合模糊数学理论优化了管幕参数.研究结果表明:小直径管幕顶板工法修建地铁车站时,拆除导洞壁施作顶板阶段是施工过程中控制地层变形的关键阶段,影响上述4个指标的最关键参数为钢管直径,优化后的最佳参数组合:钢管直径为400 mm、钢管间距为800 mm、钢管壁厚为10 mm、管内混凝土为C40、钢管采用Q390钢.In response to the challenges of low bearing capacity and complex construction procedures in traditional pipe roofing method,a novel pipe roofing method,namely small‑diameter pipe roofing method is proposed,which is applied in the construction of the Heping South Street Station of Shenyang Metro.A three‑dimensional finite difference model for this project is established,to investigate the ground deformation characteristics during the construction.The influence of pipe‑roof parameters on four indicators:maximum surface settlement at the mid‑span after the station construction,ground disturbance caused by pipe roofing construction,pipe roofing stiffness,and cost is clarified.Finally,the pipe‑roof parameters are optimized using fuzzy mathematics theory.The research results show that when constructing a subway station using the small‑diameter pipe roofing method,the stage of removing the pilot tunnel wall and constructing the roof is the critical for controlling ground deformation.The most critical parameter affecting the above four indicators is the steel tube diameter.The optimized combination of parameters is steel tube diameter of 400 mm,steel tube center distance of 800 mm,steel tube wall thickness of 10 mm,concrete strength grade inside the tube is C40,and the steel tube strength grade is Q390.

关 键 词：小直径管幕工法 变形特性 参数优化 地铁车站 模糊数学 

分 类 号：TU93[建筑科学—结构工程]