Analysis of freezing temperature field in connecting #br#
passage of cement improved soil layer
Huang Jianhua1,2 Yan Gengming1 Yang Luming1
1. College of Civil Engineering, Fujian University of Technology, Fuzhou 350118, China;
2. Fujian Province Key Laboratory in University of Underground Engineering, Fujian University of Technology, Fuzhou 350118, China
Abstract：In the construction of connecting passages in subway projects, most of the researches on the temperature field of artificially frozen soil layers are currently concentrated on the natural soil layer, while less attention is paid to the development and characteristics of the frozen temperature field in the cementimproved soil layer. This paper systematically studies the effect of cement improvement on the freezing temperature field of the connecting passage, and a three-dimensional numerical model of the freezing excavation of the connecting passage is established. Considering the thermal conductivity, specific heat capacity, latent heat of phase change and other influencing factors, comprehensively measured data and experiments, the development and distribution of the freezing temperature field in natural soil layers and cement-improved soil layers is analyzed. The research results indicates that compared with the natural silty soil layer, the cement-modified soil has faster development of freezing temperature field and weaker freezing effect. In the first 33 days of the active freezing period, the freezing temperature field develops fast, but develops slowly after the adjacent freezing fronts intersect. After the cement is improved, the development of the soil freezing temperature field is most sensitive to the change of thermal conductivity. The heat capacity and the latent heat of phase also have influence to some extent. The research results verify that the measurement integrating the artificial freezing combined with the cement improvement has a significant reinforcement effect on the silty soil layer.
黄建华 严耿明 杨鹿鸣. 水泥改良土地层联络通道冻结温度场分析[J]. 土木工程学报, 2021, 54(5): 108-116.
Huang Jianhua Yan Gengming Yang Luming. Analysis of freezing temperature field in connecting #br#
passage of cement improved soil layer. 土木工程学报, 2021, 54(5): 108-116.
