以港珠澳大桥珠海连接线拱北隧道为工程实例，研究管幕冷冻法工艺中地层的冻胀控制原理和技术。基于热力耦合原理，采用有限元预测人工冷冻过程中的土体温度变化及地表冻胀位移，比较和分析管幕周围土体预注浆和采用限位管模式对地表冻胀的控制效果。结果表明： 管幕周围土体的预注浆降低了土体的渗透系数及冻胀率，抑制了土中水分迁移，是冻胀控制技术的主体；限位管有效地降低了冻土的发展速率，加强了冻胀控制效果，是冻胀控制技术的有效补充。通过对现场地表冻胀实测数据与有限元模拟结果的比较分析，从地层温度和地表位移分布规律说明了冻胀控制技术的工作原理。研究结果为拱北隧道的顺利实施提供了技术保障，提高了我国复杂条件下超大断面隧道建造的总体技术，还可为类似人工冷冻法隧道施工提供技术参考。

The ground frost heave control technology used in Gongbei Tunnel on Zhuhai Connetcting Line of Hong KongZhuhaiMacao Bridge constructed by pipe roof and ground freezing method is analyzed. And then the soil temperature and ground surface displacement are predicted by finite element simulation based on thermalmechanical coupling theory; the control effects of the frost heave by using pregrouting around pipe curtain and frozen depth limiting tubes are compared and analyzed. The results show that: (1) The permeability, frost heave rate and water transfer of the ground are reduced by pregrouting around pipe curtain, which plays a critical role in the frost heave control. (2) The frozen depth limiting tubes can relieve the development rate of the frozen soil, strengthen the effect of frost heave control, and as well, serve as an effective supplementary of the frost heave control. The comparison between simulated ground surface displacement and the field monitoring results is made; and the frost heave control principle is explained from the aspects of distribution of ground temperature and ground surface displacement. The results can provide technical support for successful construction of Gongbei Tunnel, improve the construction technique of the superlarge crosssection tunnel under complex conditions in China, and provide valuable reference for the construction of tunnels using similar artificial ground freezing method in the future.