一次扣拱管廊暗挖施工优化方案研究  

Research on the optimisation scheme of concealed excavation construction of once-buckled arch pipe gallery

作　　者：盖文 张鹏 易领兵 霍正威 李俊昊 GAI Wen;ZHANG Peng;YI Lingbing;HUO Zhengwei;LI Junhao(Zhongsheng Design Group Co.,Ltd.,Jilin Branch,Changchun 100088,Jilin,China;China Railway Tunnel Bureau Group(Shanghai)Special High-Tech Company Limited,Shanghai 201306,China;CCCC Rail Transit Division,Beijing 100088,China;China Construction Seventh Engineering Company Limited,Zhengzhou 450000,Henan,China)

机构地区：[1]众生设计集团有限公司吉林省分公司,吉林长春130021 [2]中铁隧道局集团(上海)特种高新技术有限公司,上海201306 [3]中国交建轨道交通事业部,北京100088 [4]中国建筑第七工程局有限公司,河南郑州450000

出　　处：《工程建设》2024年第10期31-37,共7页Engineering Construction

基　　金：河南省科技厅自然科学基金资助项目(162102210188);河南省建筑业协会科研开发项目(YJX-2023-K01、YJX-2023-K02)。

摘　　要：为研究一次扣拱管廊暗挖施工引起的变形特征,以某侧穿高架桥地下管廊施工项目为工程背景,采用有限元软件Midas GTS对一次扣拱暗挖施工过程进行数值模拟,分析一次扣拱暗挖管廊施工对拱顶、地表及桥梁承台的沉降变形影响。通过改变扣拱顺序及扣拱进尺建立不同的数值模型,对比相同监测点位沉降值,对施工方案进行优化,得到最佳的扣拱顺序和扣拱进尺,并将数值计算结果与现场监测数据对比,验证数值模型的准确性。结果表明:在实际施工过程中,从中部向两端依次扣拱对沉降影响较小,沉降量比正序施工小5%~10%;采用6 m进尺方案扣拱施工对地表及桥墩均有影响,地表沉降最大值增大3.7 mm,拱顶沉降量达到2.2 mm。本文结果可为类似工程提供一定的借鉴和参考。In order to study the deformation characteristics caused by the concealed excavation of a once-buckled arch pipe gallery, the construction project of an underground pipe gallery on a side piercing viaduct is taken as the engineering background, the finite element software Midas GTS is adopted to numerically simulate the construction process of the once-buckled arch concealed excavation, and the effects of the once-buckled arch concealed excavation pipe gallery construction on the settlement deformation of the vault, the ground surface and the bridge abutment are analyzed.Different numerical models are established by changing the buckling arch sequence and buckling arch feed, comparing the settlement values of the same monitoring points, optimizing the construction scheme, and obtaining the best buckling arch sequence and buckling arch feed, and comparing the numerical calculation results with the on-site monitoring data to verify the accuracy of the numerical model.The results show that: in the actual construction process, from the middle to the ends of the sequential buckling arch on the settlement impact is small, settlement is smaller than the positive order of the construction of 5%~10%;using 6 m footage program buckling arch construction on the surface and abutments have an impact on the surface of the surface settlement of the maximum increase of 3.7 mm, the top of the arch settlement amount reached 2.2 mm.the results of this paper can be a certain reference and reference for similar projects.

关 键 词：PBA法 管廊 一次扣拱 侧穿桥桩 变形 

分 类 号：TU990.3[建筑科学—市政工程]