中南大学学报（自然科学版）2025，Vol.56Issue(5)：1944-1956,13.DOI:10.11817/j.issn.1672-7207.2025.05.021
富水粉细砂层环形排布冻结管冻结温度场及"群管效应"
Temperature distribution and"group pipes effect"of annulary arranged freezing pipes in water-rich fine sand
摘要
Abstract
To investigate the characteristics of artificial freezing in water-rich fine sand,a horizontal artificial freezing experiment with freezing pipes annularly arranged was designed and conducted.The development of the temperature field and frost heave forces were explored during freezing processes,and the influence of the"group-pipe effect"on freezing process was also analyzed.The results show that the annular arrangement freezing process can be divided into 4 phases:initial freezing,the closure of frozen wall,"group pipes effect"freezing and complete frozen of soil inside the ring.After the closure of the frozen wall,the cryogenic energy is constantly superimposed towards the soil inside the ring due to the"group pipes effects".It accelerates the freezing front to expand towards soil inside the freezing pipe ring and the soil frozen temperature inside the freezing pipe ring is obviously lower than that of outside the ring.Compared with the soil in the ring top,the"group pipes effects"is not obvious at the ring bottom,which implies that increasing the freezing pipe distance will reduce the"group pipes effects".The closure time of the frozen wall at the ring bottom is 2.2 times of that of the ring top.The average temperature of the frozen wall and the final freezing temperature of the soils within the freezing pipe ring for the cup bottom are 6.1℃and 6.7℃,respectively.The frost heave forces for the soils around the pipe ring increase with the increase of the freezing time.The closer the distance to the freezing pipes,the greater the frost heave force,with symmetrical distribution about the center of the pipe circle.The frost frozen force between adjacent pipes rapidly increases during the frozen wall developing process and it is greater than the frost frozen force around the pipe ring.关键词
人工地层冻结法/模型试验/冻结温度场/群管效应/富水粉细砂层/冻胀力Key words
artificial ground freezing method/experimental test/freezing temperature field/group pipes effect/water-rich fine sand stratum/frost heave force分类
土木建筑引用本文复制引用
丁明睿,梁荣柱,李忠超,吴文兵,白天麒,肖铭钊,汪亦显,黄栋,刘海锐..富水粉细砂层环形排布冻结管冻结温度场及"群管效应"[J].中南大学学报（自然科学版）,2025,56(5):1944-1956,13.基金项目
国家自然科学基金资助项目(41807262) （41807262）
武汉市市政集团科研项目(wszky201819)(Project(4807262)supported by the National Natural Science Foundation of China （wszky201819）
Project(wszky201819)supported by Research Project of Wuhan Municipal Construction Group) （wszky201819）
