寇玉冬,刘春.基于高精度光纤测温的水热耦合试验[J].河南理工大学学报（自然科学版）,2023,42(3):88-94.

KOU Y D, LIU C.Water-heat coupling test based on optical fiber temperature measurement with high-precious[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(3):88-94.

基于高精度光纤测温的水热耦合试验

寇玉冬1, 刘春1,2

1.南京大学 地球科学与工程学院，江苏 南京  210023;2.南京大学（苏州） 高新技术研究院，江苏 苏州  215123

摘要:为探究城市浅层地表下的水热耦合过程和影响因素，设计高精度传感器监测室内试验平台，开展考虑温度-渗流-覆盖层的水热耦合试验，以实现分布式温度场监测。结果表明：渗流参与时土体温度场变化剧烈，渗流速率更大，升温速率可提高数十倍以上；水温越高，与土体温差越大，温度场变化越明显；不同覆盖层下土体升温过程不同，聚乙烯板下土体温度升温最慢，且低于其他材料的；土层性质相同，温度变化速率较一致，渗透性高有利于渗流与传热；减弱覆盖层渗流流动，改变渗流场，进而影响温度场分布；渗流为热能载体，扰动初始热对流状态，温度场将重新分布；温度影响渗流黏滞系数等，改变渗流场；三者耦合决定了土体温度场。

关键词:地下水渗流;覆盖层;水热耦合;高精度传感器

doi:10.16186/j.cnki.1673-9787.2021030040

基金项目:国家自然科学基金资助项目（41761134089，41977218）；江苏省自然科学基金资助项目（BK20170393）

收稿日期:2021/03/10

修回日期:2021/06/04

出版日期:2023/05/25

Water-heat coupling test based on optical fiber temperature measurement with high-precious

KOU Yudong1, LIU Chun1,2

1.School of Earth Science and Engineering，Nanjing University，Nanjing  210023，Jiangsu，China;2.High-tech Research Institute，Nanjing University（Suzhou），Suzhou  215123，Jiangsu，China

Abstract:In order to study the water-heat coupling process and its influence factors in urban subsurface，an indoor test platform with high-precision sensors was designed to operate the water-heat coupling test considering temperature，seepage and coverage types herein to recognize distributed monitoring of temperature field.Results indicated that：The change of soil temperature field under seepage was more intensive，the larger flow rate makes heat rate increase by dozens of times；The higher temperature or temperature difference between soil and flow，the greater temperature field changed；Heating process of the soil under different coverage was distinct，the heat rate of the soil under polyethylene board was the lowest；The heating rate was same with the same soil properties，especially higher permeability was benefit to heat and flow transmission；The covering types weakened the seepage’s diffusion，disturbed seepage field，affected the distribution of temperature field；The seepage，carrying heat，disturbed the initial state of heat convection and motivated a new temperature field to appear；Heat affected the viscosity coefficient of seepage and changed seepage field，those of three factors were coupled to determine the soil temperature field.

Key words:seepage of groundwater;coverage type;water-heat coupling;high precision sensor

基于高精度光纤测温的水热耦合试验_寇玉冬.pdf