兰州地铁联络通道人工冻结法温度场分析

Analysis of Temperature Field in Lanzhou Subway Cross-passage Excavation Using Artificial Ground Freezing Method

本文以兰州地铁2号线定西路站至五里铺站区间联络通道冻结法施工为背景,根据冻结法设计方案对温度场变化进行了监测,并利用ABAQUS软件对该联络通道的冻结法的冻结过程进行了数值模拟,对冻结温度场模拟数据与现场实测数据进行对比和验证,并在此基础上对冷冻液温度变化和土层变化对温度场形成的影响进行了研究。研究表明:冷冻液的温度越低,冻结温度场形成速度越快,冻结壁温度也越低;不同土层的热物理系数不同对冻结温度场的发展速度和冻结壁温度有较大的影响。

In this paper,the artificial freezing method applied in the excavation of cross-passage between Dingxi Road station and Wulipu station,Lanzhou subway line2 is taking as the research object.According to the ground freezing method design plan.the change of the soil temperature field was measured.The ground freezing process of the excavation of cross-passage was numerically simulated using ABAQUS software,and the freezing temperature field simulation data were compared and verified with the field measured data.On this basis,the influence of the change of freezing coolant temperature and the change of soil thermal physical coefficient on the formation of temperature field was studied.The results show that the lower the freezing coolant temperature,the faster the formation of the freezing temperature field,and the lower the freezing wall temperature.The different thermal physical coefficients of different soil layers have a greater influence on the development speed of the freezing temperature field and the freezing wall temperature.