盾构隧道长距离联络通道冻结设计优化研究  

Freezing Design Optimization of Long-distance Contact Channel of Shield Tunnel

作　　者：夏正茂 XIA Zhengmao(China Electric Power Construction(Guangzhou)Rail Transit Construction Co.,Ltd.,Guangzhou,Guangdong 510330,China)

机构地区：[1]中电建(广州)轨道交通建设有限公司,广东广州510330

出　　处：《施工技术（中英文）》2024年第21期64-70,共7页Construction Technology

基　　金：国家自然科学基金面上项目(52178398)。

摘　　要：长距离联络通道冻结土体范围大,冻结周期长,同时过大的冻胀、融沉位移需进行大量的跟踪注浆加固,施工成本高,且注浆材料中的化学添加料可能造成地下水污染。因此,以郑州地铁8号线联络通道工程为依托,通过建立热-力耦合三维计算模型,基于温度场与位移场计算结果,提出联络通道冻结设计优化措施,实现更精准的地层加固控制,避免过多的融沉注浆,提高经济与环保效益。研究结果表明,通过减小联络通道拱顶与底部冻结管仰角,可减小冻结过程中的冻结壁厚度,从而减小冻胀位移,同时可保证冻结壁有效厚度与冻土平均温度。Long-distance contact channel freezing soil range is huge,the freezing cycle is long,at the same time,the excessive frost heaving and thaw settlement displacement needs a lot of tracking grouting reinforcement,the construction cost is high,and the chemical additives in the grouting material may cause groundwater pollution.Therefore,based on the contact channel project of Zhengzhou Subway Line 8,a heat-force coupling three-dimensional calculation model is established,according to the calculation results of temperature field and displacement field,the freezing design optimization measures of the contact channel are proposed.It can achieve more accurate formation reinforcement control,avoid excessive thaw settlement grouting,and improve economic and environmental benefits.The research results show that by reducing the dispersion angle of the freezing pipes at the top and bottom of the contact channel arch,the thickness of the freezing wall can be reduced during the freezing process,so as to reduce the frost heaving displacement,and at the same time,it can ensure the effective thickness of the freezing wall and the frozen soil average temperature.

关 键 词：隧道 联络通道 管片 冻结壁 冻胀 融沉 

分 类 号：U455[建筑科学—桥梁与隧道工程]