新型管幕冻结法温度场影响参数分析

新型管幕冻结法中冻结管周围温度场的发展状况是这一工法施工的技术重点，为研究这一工法中温度场的发展变化规律，在模型中选取2条路径，并在路径上布设分析点，通过分析土体导热系数、容积热容量、相变潜热、原始地温这4个因素对温度场发展规律的影响，形成如下结论:与港珠澳拱北隧道管幕冻结法相比，新型管幕冻结法支护形式更加灵活多样，受地形制约更小；土体导热系数对温度场有显著的影响，导热系数越大，温度下降越快，且幅度越大；容积热容量对温度场的影响效果较大，容积热容量越小，温度下降越快，且幅度越大；土体相变潜热对温度场变化几乎没有影响；原始地温越低，达到相同温度所需要的冻结时间越短。所得结果可供今后类似工程参考。 

Analysis of influencing parameters of temperature field in a new pipe-roofing freezing method

The development status of the temperature field around the freezing pipe in the method of pipe roofing freezing is the technical focus of this construction method. In order to study the development of the temperature field in this method, two paths are selected in the model, and analysis points are placed on the path. By analyzing the effects of soil thermal conductivity, volumetric heat capacity, latent heat of phase change, and original ground temperature on the development law of the temperature field, the following conclusion was drawn:Compared with the method of freezing the pipe curtain of the Gongbei tunnel in Hong Kong-Zhuhai-Macau, the new method of pipe freezing was adopted. Supporting forms are more flexible and diverse, and are less constrained by the terrain; soil thermal conductivity has a significant effect on the temperature field, the greater the thermal conductivity, the faster the temperature drop, and the greater the magnitude; the volumetric heat capacity has a greater effect on the temperature field, the smaller the volumetric heat capacity, the faster the temperature drop, and the greater the magnitude; the latent heat of soil phase change has almost no effect on the change of temperature field; the lower the original ground temperature, the shorter the freeze time required to reach the same temperature. The results obtained can be used as reference for similar projects in the future.