深厚强透水地层下基坑水平封底方案研究  

Research on Horizontal Bottom Sealing Scheme for Excavation in Deep and Strong Permeable Strata

作　　者：田红梅 TIAN Hong-mei(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi′an 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《价值工程》2024年第18期60-62,共3页Value Engineering

摘　　要：本文以长沙地铁某项目为依托,针对深厚强透水卵石地层下的地铁深基坑工程,通过对悬挂式止水帷幕与水平封底方案不同止水方案的分析,确定悬挂式止水帷幕与基坑水平封底隔渗帷幕的设计参数。最后,通过三维有限元模型对车站深基坑水平封底方案进行分析,进一步分析基坑深层水平封底隔渗帷幕的性能。研究结果表明:基坑水平封底帷幕整体隔渗性能较好,基坑内部水位降深能够满足施工要求,且基坑外水位降深基本无变化。Based on a certain project of Changsha Metro,this article analyzes the design parameters of the suspended water stop curtain and the horizontal bottom sealing impermeable curtain for the deep foundation pit project of the subway under the deep and strong permeable pebble layer.Through the analysis of different water stop schemes of the suspended water stop curtain and the horizontal bottom sealing impermeable curtain of the foundation pit,the design parameters of the suspended water stop curtain and the horizontal bottom sealing impermeable curtain are determined.Finally,a three-dimensional finite element model was used to analyze the horizontal bottom sealing scheme of the deep foundation pit of the station,and further analyze the performance of the deep horizontal bottom sealing and impermeable curtain of the foundation pit.The research results indicate that the overall impermeability performance of the horizontal bottom sealing curtain of the foundation pit is good,and the internal water level drop of the foundation pit can meet the construction requirements,while the external water level drop of the foundation pit remains basically unchanged.

关 键 词：深基坑 强透水层 悬挂式止水帷幕 水平封底 

分 类 号：U231.3[交通运输工程—道路与铁道工程]