Abstract： With the increasing demand for urban mass transit technology, there is a massive market for construction of subway in modern cities in China. In addition, connecting passages, as the necessary structures of subway, of which the construction has close relationship with geological conditions of section, generally needs to be constructed with ground improvements, such as the artificial ground freezing method. The characteristics of red sandstone formation when encountering water is poor, and it is immature, both for theory and experience, to construct connecting passages in such formation. Based on the Lanzhou Metro Line 1 project,the temperature field of single freezing pipe in the tertiary water-rich fine sandstone was studied and an improved formula for calculating the steady-state freezing temperature field of a single freezing pipe was presented. Furthermore, this paper conducted the numerical simulation, and also discussed the applicability of the improved calculation formula of transient temperature field and the steady-state temperature field. The results show that: with the increase of time, the transient temperature field gradually approaches the steady-state temperature field with the same freezing front radius. When the freezing time reaches a certain maximum, the distribution form of the two temperature fields will be consistent. The calculation formula of transient temperature field is high reliable, and so can be used in some practical engineering cases. The steady-state temperature field calculation formula can be regarded as a special form of the transient temperature field formula, which can be combined with the empirical value of the thickness of the frozen wall; the actual reliability of this steadystate temperature field calculation formula is validated to be high.
向亮 王飞 靳宝成 欧阳奥辉. 红砂岩地层联络通道冻结法施工温度场分布研究[J]. 土木工程学报, 2020, 53(S1): 306-311.
Xiang Liang Wang Fei Jin Baocheng Ouyang Aohui. The distribution of temperature field with the construction of connecting #br#
passage in red sandstone formation by freezing method. 土木工程学报, 2020, 53(S1): 306-311.
