Model test and numerical simulation of frost heave during twin-tunnel construction using artificial ground-freezing technique
Model test and numerical simulation of frost heave during twin-tunnel construction using artificial ground-freezing technique
复制标题
人工地冻技术双隧道施工冻胀模型试验与数值模拟
DOI：
10.1016/j.compgeo.2019.103155
复制
发表时间：
2019
影响因子：
5.3
通讯作者：
Cheng Hua
中科院分区：
文献类型：
--
作者：
Cai Haibing;Li Sheng;Liang Yu;Yao Zhishu;Cheng Hua
本文结合上海地铁中国段双隧道冻结工程的实际情况，建立了一套能够模拟水平冻结的模型试验系统，对隧道内的温度分布和冻胀位移进行了研究。模型试验结果表明，土体的冻胀位移与冻结壁的关闭时间密切相关。在模型试验中采用顺序冻结模式时，受水迁移影响，下行隧道冻结期的冻胀位移小于上行隧道冻结期的冻胀位移。考虑上行和下行隧道顺序冻结和同时冻结两种不同的冻结模式，对双隧道水平冻结进行了数值模拟。与同步冻结法相比，顺序冻结法能更大程度地减小冻胀位移。该研究可为采用人工冻土技术的双洞隧道设计和施工提供参考。
Based on the actual twin-tunnel freezing project of the Shanghai Metro in China, this study aims to establish a model test system that can simulate horizontal ground freezing, and the temperature distribution and frost heave ‘displacement are investigated. The model test results show that the frost heaving displacement of the soil was closely related to the closure time of the frozen wall. When the sequential freezing mode was adopted in the model test, the frost heaving displacement during the freezing period of the downlink tunnel was smaller than that during the freezing period of the uplink tunnel under the influence of water migration. Considering two different freezing modes, namely, sequential freezing and simultaneous freezing of uplink and downlink tunnels, we conducted a numerical simulation of the horizontal ground freezing of the twin tunnels. Compared with simultaneous freezing, sequential freezing can reduce frost heave displacement to a larger extent. This study can provide a reference for the design and construction of twin tunnels using artificial ground-freezing technique.