黄土地区PBA法暗挖车站快速施工关键技术研究  

Study on Key Technology of Rapid Construction of Underground Excavation Station with PBA Method in Loess Area

作　　者：商学旋 徐岩军 黄开雷 杨焜 刘义 席宇 李伟 SHANG Xuexuan;XU Yanjun;HUANG Kailei;YANG Kun;LIU Yi;XI Yu;LI Wei(Railway Construction Engineering Department,Shaanxi Construction Engineering Group Co.,Ltd.,Xi’an,Shaanxi710004,China;Institute of Underground Space Engineering,Shaanxi Architecture Science Research Institute Co.,Ltd.,Xi’an,Shaanxi710082,China)

机构地区：[1]陕西建工集团股份有限公司铁建工程部,陕西西安710004 [2]陕西省建筑科学研究院有限公司地下空间工程研究所,陕西西安710082

出　　处：《施工技术（中英文）》2024年第1期80-86,共7页Construction Technology

基　　金：陕西省科学技术厅重点研发计划(2021SF-459);陕西省建筑科学研究院有限公司科研项目(2021h-13-379)。

摘　　要：西安地铁何家营站是首次将“上四下二”六导洞PBA开挖工法应用于黄土地区的地下暗挖车站。群洞开挖本身具有较高的安全风险,而本项目工期紧张,需加快施工进度。利用MIDAS GTS NX对原导洞开挖方案进行优化,采用了上、下部导洞同时开挖、错距进行的方法。通过对比分析,结果表明:采用优化方案开挖时,地表沉降较小;上部边导洞的拱顶竖向变形明显增大,其余导洞的竖向变形均略小于原方案;上部边导洞的初支结构弯矩有小幅增长,其他导洞初支结构弯矩略有减小。通过技术经济指标对比分析,优化开挖方案在确保安全的前提下,能够极大提高施工效率,有效节约工期和费用。现场按优化方案开挖完成后,实测地表沉降未超出施工控制要求,且与计算结果较为吻合。The Hejiaying Station of the Xi’an Metro is the first underground excavation station that applies the PBA excavation method of the“upper four lower two”six-pilot tunnel to the loess area.The excavation of group holes itself has a high risk,furthermore,the construction period of this project is tight.Therefore,it is necessary to speed up the construction progress.MIDAS GTS NX was used to optimize the excavation scheme of the original pilot tunnel,and the method of simultaneous excavation of the upper and lower pilot tunnels and alternate distance was adopted.Through comparative analysis,the results show that the surface settlement is small when the optimization scheme is used for excavation.The vertical deformation of the vault of the upper side pilot tunnel is obviously increased,and the vertical deformation of the other pilot tunnels is slightly smaller than that of the original scheme.The bending moment of the primary support structure of the upper side guide hole increases slightly,and the bending moment of the primary support structure of other guide holes decreases slightly.Through the comparative analysis of technical and economic indicators,the optimized excavation scheme can greatly improve construction efficiency and effectively shorten the construction period and cost while ensuring safety.After the excavation is completed according to the optimized scheme,the measured surface settlement does not exceed the construction control requirements,and it is in good agreement with the calculation results.

关 键 词：地铁车站 黄土地区 导洞 PBA工法 数值模拟 沉降 

分 类 号：U231[交通运输工程—道路与铁道工程]