摘要
为研究滨海饱和粉砂地层中冻结法联络通道在渗流-盐分共同作用下的冻结效应,以南通地铁1号线永兴大道站—深南路站区间4#联络通道为工程背景,提出渗流-盐分共同作用下的水-热-力三维多场耦合分析方法。首先,根据工程概况,开展现场监测工作,分析监测结果;其次,建立三维数值分析模型;最后,采用多物理场仿真软件COMSOL Multiphysics,模拟饱和粉砂土体的冻结过程。结果表明:1)数值模拟结果与现场监测数据吻合度较高,建立的数值计算模型可靠;2)渗流和盐分的共同作用会延迟人工冻结时长,最大延缓时间为7.36 d;3)水头差导致冻结壁呈现非对称状,上游冻结温度下降过缓,形成的冻结壁较薄,下游冻结壁较厚;4)土中盐分仅减缓了人工冻结降温速率。
In coastal saturated silt sand strata,the freezing effect of the connecting gallery is significantly affected by the interaction between seepage and salinity.To address this problem,a three-dimensional thermo-hydro-mechanical multifield coupling method under the interaction of seepage and salinity is proposed based on a case study regarding the#4 connecting gallery between the Yongxing Avenue Station and Shennan Road Station of Nantong metro line 1 constructed using artificial freezing method.First,in-situ monitoring results are analyzed.Then,a three-dimensional numerical analysis model is established.Finally,the commercial software COMSOL Multiphysics is used to simulate the freezing process of saturated silt sand strata.The outcomes of the study show that:(1)The numerical simulation results are in good agreement with the field monitoring data and the established numerical calculation model is highly reliable.(2)The combined effects of seepage and salinity will delay the artificial freezing time,and the maximum delayed time is 7.52 days.(3)The difference in waterhead causes an asymmetrical frozen wall.Hence,the upstream freezing temperature drops very slowly,resulting in a thinner frozen wall and a thicker downstream frozen wall.(4)Furthermore,the salinity can only slow down the cooling rate of the artificial freezing method.
作者
王长虹
张海东
董济涵
李飞
何红员
WANG Changhong;ZHANG Haidong;DONG Jihan;LI Fei;HE Hongyuan(Department of Civil Engineering,School of Mechanics and Engineering Sciences,Shanghai University,Shanghai 200444,China;The 3rd Engineering Co.,Ltd.of China Railway Tunnel Group,Shenzhen 518000,Guangdong,China)
出处
《隧道建设（中英文）》
CSCD
北大核心
2023年第6期948-958,共11页
Tunnel Construction
基金
上海高校特聘教授岗位计划(TP2018042)
上海市浦江人才计划(18PJ1403900)
上海市社会发展科技攻关项目(21DZ1204300)。
关键词
地铁联络通道
冻结法
饱和粉砂地层
水-热-力多场耦合
数值模拟
metro connecting gallery
freezing method
saturated silt sand strata
thermo-hydro-mechanical multifield coupling
numerical simulation
