201 8年 12月下
第47卷 第 24期
施 丁 技 术
C0NSTRUCTl0N|rECHN0LOGY 29
DOI:1 0.7672/sgjs20 1 8240029
下 伏 溶 洞 对 穿 越 上 砂 下 黏 地 层 隧 道 管 片
变 形 影 响 分 析 木
李 萍 ,李 威 ,文 武 双 ,高 诗 明 ,陈 建 平
(1.ee国地质大学(武汉)工程学院,湖北 武汉 430074;
2.中铁十一局集团城市轨道x-程有限公司,湖北 武汉 430074)
[摘要]以武汉地铁 6号线 Ⅱ标段“前马区间”为.【=程背景,针对其上砂下黏且下伏灰岩溶洞发育的地质条件 ,运用
有限差分软件 FLAC3D 5.0建立三维数值分析模型,在考虑流同耦合效应的基础上,研究下伏溶洞对穿越上砂下黏
地层盾构隧道管片变形的影响。针对不同的溶洞距基岩面距离 d、溶洞直径 D、跨度 w、溶洞充填率 ∞,分析隧道管
片水平及竖直方向变形。结果表明:溶洞距基岩面距离 d越大、溶洞直径 D越小 、跨度 w越小、溶洞充填率 越大,
隧道管片的变形越接近无溶洞情况;下伏溶洞的存在一定程度上抑制管片的水平位移收敛变形; 从 0.75增大到
1.00时,管片竖向变形大幅度减小,进行溶洞处理时需充分注浆。
[关键词]隧道工程;溶洞;数值模拟 ;变形;施工技术
[中图分类号]U455.43 [文献标识码]A [文章编号]l002-8498(2018)24—0029~5
Analysis of the Influence of the Underlying K arst Cave on the
D eform ation of the Tunnel Tube Going Through Upper
Sand Lower Clay Stratum
LI Ping ,LI Wei:,WEN Wushuang ,GAO Shiming ,CHEN Jianping
(1.FfJf’uh)o/’Engineering,China I/nit ersit)oJ Geosl⋯it f,s(Wuhan),Wuh,n,Hubei 430074.China;
2.China Railu_fj、1 1 th Bureau Grout~C Rail Enginet,ring Co..Ltd.. ’uhun.Hubei 430074,Chinn)
Abstract:This paper regards the‘‘front horse section’’of section II of Wuhan Subway line 6 as the
engineering background.According to the geological conditions of upper sand lower clay and development
karst cave in underlying limestone,this paper uses finite difference software FLAC3 D 5.0 to establish the
three—dimensional nunmrieal analysis mode1.On the basis of considering the fluid—solid coupling effect,
the influence of the underlying karst cave off the deformation of the shield tunnel tube going through upper
sand lower clay stratum is studied.For different distances from karst cave to bedrock surface,diameter
and filling rate of karst cave,this paper analyzes the horizontal and vertical deformation of the tunnel
tube.The resuits show that the distance fronl karst cave to bedrock surface is greater,the karst cave’s
diameter is smaller,the karst cave’s span is smaller and the karst cave’s filling rate is greater,the
deformati0n()f tunne1 tube is closer to insoluble hole.The exist of the underlying karst cave is inhibited to
the horizontal displacement convergent deformation of the tube to a certain extent.When the filling ratio
of karst eave increases from 0.75 to 1.00,the vertical deformation of the tube is greatly reduced,it
suggests that sufficient grouting is required for cavern treatment.
Key words:tunnels;karst cave;simulation;deformation;construction
0 引言
上砂 下黏 组合 地 层 含 水 量 丰 富
下伏溶洞对穿越上砂下黏地层隧道管片变形影响分析(论文).pdf