PBA法地铁车站全过程沉降规律及控制优化研究  

The Whole Process Settlement Law and Control Optimization of Subway Station by PBA Method

作　　者：苏志刚 SU Zhigang(China Railway 21st Bureau Group Rail Transit Engineering Co.,Ltd.,Jinan,Shandong250000,China)

机构地区：[1]中铁二十一局集团轨道交通工程有限公司,山东济南250000

出　　处：《施工技术（中英文）》2024年第8期48-53,65,共7页Construction Technology

基　　金：中铁二十一局集团科研计划项目:富水区域砂卵石地层地铁PBA施工及降水成套关键技术研究(202300002)。

摘　　要：以沈阳某地铁车站工程为依托,建立三维数值模型,对PBA法六导洞双跨地铁车站施工全过程沉降规律展开研究,采取相应措施控制地表沉降。研究表明,地表沉降随着施工进度推进而增大,随着与车站中心距离的增大而减小;沉降曲线以车站中线为轴呈对称状态,影响范围为车站中线两侧40m左右。整个施工阶段导洞开挖对地表沉降的影响最大,扣拱施工次之,两者引发的地表沉降比例高达89.21%。导洞施工顺序在施工过程中引起的沉降最小;导洞开挖进尺越短对地层扰动越小,施工过程中引起的地表沉降越小。Based on a subway station project in Shenyang,a three-dimensional numerical model was established to study the settlement law of the whole construction process of the six-guide hole double-span subway station with PBA method,and corresponding measures were taken to control the surface settlement.The research shows that the surface settlement increases with the construction progress and decreases with the increase of the distance from the center of the station.The settlement curve is symmetrical with the central line of the station as the axis,and the influence range is about 40m on both sides of the central line of the station.During the whole construction stage,the guide hole excavation has the greatest influence on the surface settlement,followed by the arch construction,and the proportion of surface settlement caused by the both is as high as 89.21%.In the construction process,the settlement caused by the construction sequence is the smallest.The shorter the excavation footage of the guide hole,the smaller disturbance to the stratum,and the smaller surface settlement caused in the construction process.

关 键 词：地铁车站 PBA法 导洞 开挖 沉降 位移 施工技术 

分 类 号：U231.3[交通运输工程—道路与铁道工程]