超长地铁联络通道水平冻结温度场变化规律分析*
崔灏
Temperature Field Variation Law of the Horizontal Freezing in Ultra-long Subway Connecting Aisle
CUI Hao
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作者信息:北京中煤矿山工程有限公司，100013，北京
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Affiliation:Beijing Coal Mine Construction Co., Ltd.， 100013, Beijing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2019.08.012
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中图分类号/CLCN:U231.4
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栏目/Col:研究报告
摘要:
掌握了超长地铁联络通道冻结温度场的变化规律，就能够预测分析地层冻结温度场，可提前判断冻结壁发展状况。以福州地铁2号线某区间超长联络通道冻结施工为例，建立三维有限元数值计算模型，通过对比分析冻结阶段的数值模拟分析结果与实测数据，验证了计算模型的准确性。基于该数值计算模型，研究了初始地温、导热系数、比热容对该温度场影响的规律。结果表明：冻结温度场变化主要分为温度快速下降与相变阶段、温度下降、土体温度稳定3个阶段；冻结壁交圈时间与初始地温、比热容近似呈线性递增关系，初始地温每升高5 ℃，交圈时间延长2d，交圈时间随比热容增加而延长；冻结壁交圈时间与导热系数呈负相关，导热系数每增高10%，交圈时间缩短1d。
Abstracts:
With a mastery of the temperature field variation law of the freezing connecting aisle in an ultra-long subway tunnel, the temperature field of the frozen stratum can be predicted and analyzed, and the development of frozen wall be judged in advance. Taking the freezing construction of the ultra-long connecting aisle on Fuzhou metro Line 1 as the background, a 3D finite element numerical calculation model is established, and the accuracy of the calculation model is verified by comparing the numerical analysis at the freezing stage with the measured data. Based on the numerical calculation model, the influence of initial ground temperature, thermal conductivity and specific heat capacity on the temperature field is studied. The results show that the variation law of freezing temperature field can be divided into three stages: rapid temperature drop and phase transformation stage; temperature drop stage and soil temperature stability stage. The intersection time of freezing wall increases linearly with the initial ground temperature and specific heat capacity. When the initial ground temperature increases 5℃, the intersection time will be extended to 2 days, and the intersection time will be prolonged with the increase of specific heat capacity. Negative correlation exists between the intersection time of freezing wall and the coefficient of heat conductivity, for every 10% increase in the later, the intersection time will be shortened by 1 day.
引文 / Ref:
崔灏.超长地铁联络通道水平冻结温度场变化规律分析[J].城市轨道交通研究，2019，22(08):54.
CUI Hao.Temperature field variation law of the horizontal freezing in ultra-long subway connecting aisle[J].Urban Mass Transit，2019，22(08)：54.
CUI Hao.Temperature field variation law of the horizontal freezing in ultra-long subway connecting aisle[J].Urban Mass Transit，2019，22(08)：54.
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