地铁联络通道冻结法施工冻融全过程温度场发展特性及影响因素分析
黄洁1何亮1陈军浩2
Analysis of Development Characteristics and Influencing Factors of Temperature Field during Metro Cross Passage Thawing Full Process
HUANG JieHE LiangCHEN Junhao
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作者信息:1.1.中煤科工集团南京设计研究院有限公司， 210031， 南京;
2.2.地下工程福建省高校重点实验室，350108， 福州
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Affiliation:China Coal Technology & Engineering Group Nanjing Design & Research Institute Co., Ltd., 210031, Nanjing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.12.018
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中图分类号/CLCN:TU472.9∶U231.+3;TU472.9
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栏目/Col:研究报告
摘要:
以福州地铁金山站—金祥站区间联络通道冻结法施工为工程背景，通过现场实测与有限元数值计算相结合方法，开展冻结温度场冻融全过程发展特性及影响因素分析研究。研究结果表明：冻结管内侧土体降温速率为外侧土体降温速率的1.26倍；受冻结管布置影响，喇叭口处冻结壁呈马蹄形，而通道处冻结壁呈类矩形状；正常通道段积极冻结阶段末期，冻结壁有效厚度平均值为2.62 m，平均温度为-11.3 ℃；维护冻结阶段结束时，冻结壁有效厚度增加0.23 m，平均温度降低0.2 ℃，自然解冻阶段的外侧土体温度回升速率明显高于内侧土体温度回升速率；联络通道冻结温度场发展受不同因素影响较大，在积极冻结阶段早期主要受地层初始地温度影响，积极冻结阶段后期主要受土层导热系数影响。
Abstracts:
Taking the frozen cross passage at Jinshan Station-Jinxiang Station interval of Fuzhou Metro as the engineering background, by combining field measurement and finite element numerical calculation, the development characteristics and influencing factors of frozen temperature field thawing full process are analyzed and studied. Research results show that the cooling rate of soil inside the frozen pipe is 1.26 times that of soil outside. Affected by the frozen pipe arrangement, the frozen wall at bell mouth is shaped like a horse foot, while the frozen wall at passage presents a rectangular. At the end of active freezing in normal passage section, the average effective thickness of frozen wall is 2.62 m, and the average temperature is -11.3 ℃. At the end of maintenance freezing, the effective thickness of the frozen wall increases by 0.23 m, and the average temperature decreases by 0.2 ℃. During natural thawing, the soil temperature on the outer side rises significantly faster than that on the inner side. The development of freezing temperature field in cross passage is greatly affected by different factors. The influence of initial ground temperature is mainly at the early active freezing stage, and the influence of soil thermal conductivity is mainly at the late active freezing stage.
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