南通饱和粉砂地层地铁联络通道冻结法的水-热-力耦合研究

王长虹; 张海东; 董济涵; 李飞; 何红员

doi:10.3973/j.issn.2096-4498.2023.06.005

隧道建设 >

2023 , Vol. 43 >Issue 6: 948 - 958

DOI: https://doi.org/10.3973/j.issn.2096-4498.2023.06.005

研究与探索

南通饱和粉砂地层地铁联络通道冻结法的水-热-力耦合研究

王长虹 ,
张海东 ,
董济涵 ,
李飞 ,
何红员

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（1. 上海大学力学与工程科学学院土木工程系, 上海 200444； 2. 中铁隧道集团三处有限公司, 广东深圳 518000）

王长虹（1978—），男，湖南衡山人，2008年毕业于同济大学，隧道及地下建筑工程专业，博士，特聘教授，现从事随机岩土力学-贝叶斯方法研究工作。Email: ch_wang@shu.edu.cn。 *通信作者：张海东， Email: hd_zhang1@163.com。

网络出版日期: 2023-07-14

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HydroThermoMechanical Coupling Study on Freezing Method for Metro Connecting Gallery in Saturated Silt Sand Strata in Nantong, China

WANG Changhong ,
ZHANG Haidong ,
DONG Jihan ,
LI Fei ,
HE Hongyuan

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(1. Department of Civil Engineering, School of Mechanics and Engineering Sciences, Shanghai University, Shanghai 200444, China; 2. The 3rd Engineering Co., Ltd. of China Railway Tunnel Group, Shenzhen 518000, Guangdong, China)

Online published: 2023-07-14

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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。

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

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王长虹 , 张海东 , 董济涵 , 李飞 , 何红员 . 南通饱和粉砂地层地铁联络通道冻结法的水-热-力耦合研究[J]. 隧道建设, 2023 , 43(6) : 948 -958 . DOI: 10.3973/j.issn.2096-4498.2023.06.005

Abstract

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.

Key words： metro connecting gallery; freezing method; saturated silt sand strata; thermohydromechanical multifield coupling; numerical simulation

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