上海淤泥质黏土层－50 ℃深冷冻结温度场多参数协同优化模型试验研究

doi:10.3724/1000-6915.jrme.2025.0073

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摘要在人工地层冻结法施工中，冻结温度场的高效形成受制于多参数的协同作用。为探究低温冷媒温度（－30 ℃～－60 ℃）、冷媒流量（1～7 m3/h）及冻结管间距（0.8～1.2 m）对－50 ℃深冷冻结温度场演化的协同调控机制，通过研制－50 ℃深冷冻结物理模型试验系统，对上海淤泥质黏土层开展单因素试验研究。结果表明：当冷媒温度从－30 ℃降低至－50 ℃时，冻结壁交圈时间缩短26.8%，等效冻结壁厚度形成时间缩减55.6%，等效界面冻结壁平均温度冻结时间减少71.5%；在－50 ℃冷媒温度与5 m3/h流量工况下，冻结管间距由1.2 m缩减至0.8 m时，交圈时间锐减58.8%，主面冻结壁最大厚度提升16.7%，界面平均温度降幅达33.4%；冷媒流量参数存在3 m3/h临界阈值，超限后冻结效率增益不足4.8%。研究成果首次揭示－50 ℃深冷冻结温度场演化机制，建立的参数敏感性等级量化体系为深冷冻结工艺多参数协同优化与高强度冻结帷幕快速构建提供理论支撑与工程决策依据。

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	李闻勃1
	2
	高伟1
	2
	韩圣铭1
	2
	温汉宏2
	丁航2
	黄宝龙2
	宁方波2

关键词 ：土力学, 人工冻结, 温度场, 深冷冻结, 模型试验, 交圈时间, 冻结壁厚度, 冻结壁平均温度

Abstract： In the engineering application of the artificial ground freezing method, the effective establishment of a freezing temperature field is influenced by the synergistic effects of multiple parameters. To investigate the synergistic regulatory mechanisms of cryogenic coolant temperature (ranging from －30 ℃ to －60 ℃), coolant flow rates (1–7 m3/h), and freeze-pipe spacing (0.8–1.2 m) on the evolution of the cryogenic freezing temperature field at －50 ℃, a physical model test system was developed for －50 ℃ cryogenic freezing. A single-factor experimental study was conducted on silty clay strata in Shanghai. The results indicated that as the coolant temperature decreased from －30 ℃ to －50 ℃, the freezing wall closure time was reduced by 26.8%, the time required to achieve an equivalent frozen wall thickness decreased by 55.6%, and the duration to reach the equivalent average interface temperature in the frozen walls was compressed by 71.5%. Under operational conditions with a coolant temperature of －50 ℃ and a flow rate of 5 m3/h, reducing the freezing pipe spacing from 1.2 m to 0.8 m resulted in a significant 58.8% reduction in closure time, a 16.7% increase in the maximum thickness of the main surface frozen wall, and a 33.4% decrease in the average interface temperature. Moreover, the coolant flow rate exhibited a critical threshold at 3 m3/h, beyond which the gain in freezing efficiency remained below 4.8% under cryogenic conditions. These results elucidate the evolution mechanism of the temperature field during －50 ℃ cryogenic freezing. The established quantitative system for parameter sensitivity grading offers theoretical support and serves as a foundation for engineering decision-making regarding the multi-parameter collaborative optimization of the cryogenic freezing process and the rapid construction of high-strength freezing curtains.

Key words： soil mechanics artificial ground freezing temperature field cryogenic freezing model test closure time frozen wall thickness mean temperature of frozen wall

引用本文:

李闻勃1，2，高伟1，2，韩圣铭1，2，温汉宏2，丁航2，黄宝龙2，宁方波2. 上海淤泥质黏土层－50 ℃深冷冻结温度场多参数协同优化模型试验研究[J]. 岩石力学与工程学报, 2025, 44(8): 2232-2248.
LI Wenbo1, 2, GAO Wei1, 2, HAN Shengming1, 2, WEN Hanhong2, DING Hang2, HUANG Baolong2, NING Fangbo2. Multi-parameter collaborative optimization modeling of temperature fields in －50 ℃ cryogenic freezing of Shanghai?s silty clay layer. , 2025, 44(8): 2232-2248.

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https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2025.0073 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/I8/2232

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