冻结法在强扰动地层地铁联络通道施工中的应用

结合广州地铁二、八线延长线工程南浦站-洛溪站区间联络通道冻结法施工，简述了冻结施工中关键节点--冻结施工前准备、开挖及后期融沉控制等的注意事项，并对冻结全过程的冻结盐水温度、冻土温度、卸压孔压力、冻胀压力等进行跟踪监测。通过对监测结果进行分析，获得冻结盐水温度、冻土温度、卸压孔压力、冻胀压力等变化规律，据此为联络通道冻结施工提出建议，并将本工程与常规冻结法施工进行对比，指出了卸压孔压力、冻胀压力及冻胀融沉变形等变化规律与常规地层的冻结不同。本工程的成功经验可供其他相似工程参考。

Application of Freezing Method in Construction of Connection Galleries of Metro Works in Intensely-disturbed Ground

The key points of the freezing in the construction of the connection gallery of the running tunnel from Nanpu Station to Luoxi Station on the extended section of No.2 and No.8 line of Guangzhou Metro,such as pre-freezing preparation,excavation and settlement control,are presented.The brine water temperatures,the frozen soil temperatures,the pressures in the pressure-releasing boreholes and the frost-heaving pressures are monitored.The variation rules of the brine water temperatures,the frozen soil temperatures,the pressures in the pressure-releasing boreholes and the frost-heaving pressures are obtained by means of analysis on the monitoring results and advices are made on the construction of the connection gallery.Comparison and contrast are made between this project and other conventional freezing projects and the differences in terms of the pressures in the pressure-releasing boreholes,the frost-heaving pressure and the deformation induced by the frost-heaving and thaw settlement are described.The successful experience achieved in the project can provide reference for similar projects in the future.