富水砂层零覆土地铁车站抗浮技术措施研究  

Research on Anti Floating Technical Measures for Subway Stations with Zero Cover Soil in Water Rich Sand Layer

作　　者：万尊坤 张伟 李雪洋 WAN Zunkun;ZHANG Wei;LI Xueyang(Suzhou Zhongtong Planning and Design Co.Ltd.,Suzhou Jiangsu 215133,China;China Railway Fifth Survey and Design Institute Group Co.Ltd.,Beijing 102600,China)

机构地区：[1]苏州众通规划设计有限公司,江苏苏州215133 [2]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《铁道建筑技术》2024年第2期134-137,共4页Railway Construction Technology

基　　金：苏州市科技计划项目(SS202048);中铁第五勘察设计院集团有限公司科技研发计划项目(T5Y2020-C14)。

摘　　要：为制定适合富水砂层零覆土地铁车站抗浮、内力及变形改善,且经济性较好的方案,结合零覆土地铁车站工程实例,在围护墙参与车站抗浮的前提下,利用有限元软件对底板下设置抗拔桩、底板设置折线仰拱、顶板设置夹层压载三种方案下的车站抗浮稳定性、内力及变形、工程经济性等进行对比分析。结果表明,各方案均可使车站结构变形及内力得到大幅改善,且有利于车站抗浮,各方案对结构的作用效应分别与抗拔桩桩径、桩长、底板折线仰拱矢高、顶板覆土压载厚度相关;底板下设置抗拔桩方案不利于全包防水层敷设,而折线仰拱、顶板压载方案避免了该问题;设置抗拔桩与底板设置折线仰拱方案经济性较差,而顶板压载法经济性较好,对车站结构内力及变形改善效果与其他两方案基本接近。In order to find a solution that is suitable for improving the anti floating,internal force,and deformation of subway stations with zero cover soil in water rich sand layers,and has good economic efficiency,this article combines the engineering example of a subway station with zero cover soil.Under the premise of the participation of the retaining wall in the anti floating of the station,finite element software is used to make a comparative analysis on the anti floating stability,internal force,and deformation of the station under the three schemes of setting uplift piles under the bottom plate,setting broken line inverted arches under the bottom plate,and setting interlayer compression on the top plate.The results show that under the action of the above three schemes,the deformation and internal force of the station structure have been greatly improved,and all of them are beneficial for the station′s anti floating.The effect of each scheme on the structure is related to the diameter and length of the uplift pile,the height of the bottom plate broken line inverted arch,and the thickness of the top plate soil pressure;setting uplift piles under the bottom plate is not conducive to the laying of the entire waterproof layer,and the broken line inverted arch scheme and top plate compression scheme avoid this problem;the scheme of setting uplift piles and setting broken line inverted arches on the bottom plate has poor economic efficiency,while the top plate compression method has good economic efficiency.It can also achieve a similar effect on improving the internal force and deformation of the station structure.

关 键 词：零覆土地铁车站 抗拔桩 折线仰拱 压载 抗浮技术 方案比选 

分 类 号：U231.4[交通运输工程—道路与铁道工程] U452[建筑科学—桥梁与隧道工程]