理論研究 2024年 第53卷 第21期

DOI: 10. 7672 / sgjs2024210064

盾構隧道長距離聯絡通道凍結設計優化研究

夏正茂

作者簡介：

夏正茂，副總經理，總工程師，高級工程師， E?mail:438963557@ qq. com

作者單位：

中電建（廣州）軌道交通建設有限公司，廣東廣州 510330

基金項目：

?國家自然科學基金面上項目（52178398）

摘要：

長距離聯絡通道凍結土體范圍大，凍結周期長，同時過大的凍脹、融沉位移需進行大量的跟蹤注漿加固，施工成本高，且注漿材料中的化學添加料可能造成地下水污染。因此，以鄭州地鐵 8 號線聯絡通道工程為依托，通過建立熱?力耦合三維計算模型，基于溫度場與位移場計算結果，提出聯絡通道凍結設計優化措施，實現更精準的地層加固控制，避免過多的融沉注漿，提高經濟與環保效益。研究結果表明，通過減小聯絡通道拱頂與底部凍結管仰角，可減小凍結過程中的凍結壁厚度，從而減小凍脹位移，同時可保證凍結壁有效厚度與凍土平均溫度。

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.