82
施 工 技 术
C0NSTRUCT10N TECHN0L0GY
2017年 9月上
第 46卷 第 l7期
DOI:10.7672/s鲥s2017170082
新 建 隧 道 穿 越 既 有 车 站 地 下 连 续 墙 围 护 结 构
洞 门 稳 定 性 分 析 术
李 文 峰 ,俞 蔡 城 ,杜 江 涛 。
(1.苏州轨道交通集团有限公司,江苏 苏州 215000;2.苏州大学城市轨道交通学院,江苏 苏州 215000;
3.广州地铁设计研究院有限公司,广东 广州 510000)
[摘要]新建地铁隧道下穿既有地铁车站工程中通常需要穿越车站两端的地下连续墙围护结构,如果地下连续墙
没有预留玻璃纤维筋,盾构隧道难以直接穿越,需要人工凿除地下连续墙,凿除过程中洞门附近土体产生变形,影
响既有车站的安全运营,需对土体进行加固,以保证土体稳定性和减小既有车站变形。以苏州拟建 8号线地铁隧
道下穿既有 1号线华池街站和地下连续墙围护结构为例,提出采用水平人工冷冻加固洞门附近土体 ,采用极限平
衡理论推导了洞门土体稳定性的计算公式,分析了土体稳定性的影响因素,比较了在有无土体加固情况下的土体
稳定性系数,同时采用三维有限元对地下连续墙凿除过程进行数值模拟,数值模拟和理论公式计算的土体稳定性
系数吻合良好。
[关键词]地铁 ;地下连续墙;土体稳定性;安全系数;数值模拟
[中图分类号]U231.3 [文献标识码]A [文章编号]1002—8498(2017)17-0082—05
Stability Analysis of Soil Body Adjacent to Concrete Diaphragm W all
Breakage During Tunneling Under Existing Subway Station
LI Wenfeng ,YU Caicheng ,DU diangtao
(1.Suzhou Rail Transit Croup,Suzhou,Jiangsu 215000,China;2.School ofRail and Urban Transportation,Soochow
University,Suzhou,Jiangsu 215000,China;3.Guangzhou Metro Design&Research Institute Co.,Ltd.,
Cuangzhou.Guangdong 5 1 0000。China)
Abstract:Tunneling beneath existing subway station typically requires passing through concrete
diaphragm walls used as excavation support during construction of the station. When the concrete
diaphragm walls were not reinforced by fiber glass,it is difficult for the shield machine to tunnel through
them which have to be broken by man—power.The breakage of concrete diaphragm walls induces
deformation of soil body beneath the existing subway station and impacts the normal operation of the
station.As such,soil improvement is required to protect the stability of the soils.This paper deals with
the stability analysis of the soil body during the breakage of concrete diaphragm walls using the Suzhou
metro line 8 passing beneath existing metro line 1 Huachi Street station as an example.A theoretical
formulation is developed for predicting the soil stability. The factors impacting the soil stability are
analyzed and the stability number with and without ground improvement are compared.Three dimensional
finite element analyses are performed to simulate the process of concrete diaphragm wall breakage.The
simulation results were compared with the theoretical analysis results.
Key words:subways;diaphragm wall;soil stability;safety factors;simulation
国家自然科学青年基金资助项目(51508503);江苏省普通高校研 究生科研创新计划项目(KYLXI5—1238) [
新建隧道穿越既有车站地下连续墙围护结构洞门稳定性分析(论文).pdf