理论研究 2024年 第53卷 第21期

DOI: 10. 7672 / sgjs2024210064

盾构隧道长距离联络通道冻结设计优化研究

夏正茂

作者简介:

夏正茂,副总经理,总工程师,高级工程师, E⁃mail:438963557@ qq. com

作者单位:

中电建(广州)轨道交通建设有限公司,广东广州 510330

基金项目:

∗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。

English:

Long⁃distance contact channel freezing soil range is huge, the freezing cycle is long, at thesame time, the excessive frost heaving and thaw settlement displacement needs a lot of tracking groutingreinforcement, the construction cost is high, and the chemical additives in the grouting material maycause groundwater pollution. Therefore, based on the contact channel project of Zhengzhou Subway Line8, a heat⁃force coupling three⁃dimensional calculation model is established, according to the calculationresults of temperature field and displacement field, the freezing design optimization measures of thecontact channel are proposed. It can achieve more accurate formation reinforcement control, avoidexcessive thaw settlement grouting, and improve economic and environmental benefits. The researchresults show that by reducing the dispersion angle of the freezing pipes at the top and bottom of the contactchannel arch, the thickness of the freezing wall can be reduced during the freezing process, so as toreduce the frost heaving displacement, and at the same time, it can ensure the effective thickness of thefreezing wall and the frozen soil average temperature.