软土地层同区间不同地铁联络通道冻结施工温度场发展规律
陈军浩1,2连立锦1庄言1李彧翰1朱浩霖1
Development Law of Temperature Fields during Freezing Construction for Different Metro Link Passages within Same Interval in Soft Soil Strata
CHEN Junhao1,2LIAN Lijin1ZHUANG Yan1LI Yuhan1ZHU Haolin1
-
作者信息:1.福建理工大学土木工程学院， 350118， 福州；
2.福建理工大学地下工程福建省高校重点实验室， 350118， 福州
-
Affiliation:1.College of Civil Engineering, Fujian University of Technology, 350118, Fuzhou, China;
2.Key Laboratory of Underground Engineering of Fujian Province University, Fujian University of Technology, 350118, Fuzhou, China
-
关键词:
-
Key words:
-
DOI:10.16037/j.1007-869x.20231227
-
中图分类号/CLCN:TU472.9; U231.3
-
栏目/Col:土建工程
摘要:
［目的］冻结法已广泛应用于联络通道工程建设中，其实施效果在不同地质与周边环境条件下存在一定差异，有必要进一步研究滨海软土地层中地铁联络通道冻结温度场的发展情况。［方法］以上海轨道交通15号线某区间内2条联络通道为研究背景，采用ANSYS软件建立三维有限元数值模型，基于冻结法施工过程中地层温度的变化分析冷量损失对冻结温度场发展的影响，并将数值模拟计算结果与现场实测数据进行对比验证，以分析同一地层下同区间联络通道冻结温度场的发展情况。［结果及结论］同区间2条相邻联络通道温度场发展规律相似，但由于存在盐水循环冷量损失，1号联络通道土体温度下降速度低于2号联络通道土体温度下降速度。1号联络通道冻结效率低于2号联络通道冻结效率，但2条联络通道的温度场发展差异随冻结时间的增加而逐渐减小。冻结45 d时，1号联络通道薄弱断面处四周冻结帷幕厚度均已达2.2 m，平均温度为-10.23 ℃。砂质粉土层冻结效果优于灰色粉土层冻结效果，砂质粉土层冻结发展速度为31.05 mm/d，灰色粉土层冻结发展速度为28.53 mm/d。
Abstracts:
［Objective］ The freezing method has been widely applied in link passage projects. Its implementation effects vary to some extent across different stratigraphical and surrounding environmental conditions, necessitating further research on the development of freezing temperature fields in metro link passages within coastal soft soil strata. ［Method］ Taking two link passages in an interval of Shanghai Rail Transit Line 15 as the research background, a three-dimensional finite element numerical model is established using ANSYS software. The influence of cooling capacity loss on freezing temperature field development is analyzed based on stratum temperature changes during freezing construction. Numerical simulation calculation results are compared and validated against field-measured data to examine the temperature field development in link passages within the same stratum and interval. ［Result & Conclusion］ Two adjacent link passages in the same interval exhibited similar temperature field development law. However, due to cooling capacity loss in the brine circulation system, the soil temperature decrease rate in No.1 link passage is lower than that in No.2 link passage. The freezing efficiency of No.1 link passage is inferior to that of No.2 passage, though the difference in temperature field development of the two link passages gradually diminishes with prolonged freezing duration. After 45 days of freezing, the freezing curtain thickness around No.1 link passage weak sections reaches 2.2 m, with an average temperature of -10.23℃. The freezing effect in silty sand layer surpasses that in gray silt layer, exhibiting freezing development speeds of 31.05 mm/day and 28.53 mm/day in silty sand layer and gray silty layer respectively.
- 上一篇: 大直径地铁盾构隧道全预制中隔墙顶部节点同步拼装
- 下一篇: -
过刊浏览
资料下载
友情链接