|Table of Contents|

Experimental study on thermophysical parameters and heat conduction model of low liquid limit clay during freezing(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年06期
Page:
181-190
Research Field:
岩土工程
Publishing date:

Info

Title:
Experimental study on thermophysical parameters and heat conduction model of low liquid limit clay during freezing
Author(s):
GAO Chong
(China Railway 19th Bureau Group Corporation Limited, Beijing 101300, China)
Keywords:
subway contact channel;  artificial freezing method;  thermophysical parameter;  heat conduction model;  nuclear magnetic resonance
PACS:
TU443
DOI:
10.19815/j.jace.2023.08011
Abstract:
In order to study the influence of saturation, specific heat capacity, latent heat of phase change and unfrozen water content on the artificial freezing method under different temperature conditions, the low liquid limit clay in the area was taken as the research object to carry out the experiment based on the freezing method construction of Kunming subway contact passage, and the variation law of unfrozen water content and thermophysical parameters was explored. An orthogonal ball-missing contact heat conduction model was established and verified by laboratory test results. The results show that when the temperature continues to drop to a certain temperature range(from -15 ℃ to -8 ℃), the content of unfrozen water in soil does not change much, so the cooling plan can be optimized. In the negative temperature section, the unfrozen water content of the samples with different saturation is negatively correlated with the latent heat of phase transition, and the saturation is positively correlated with the latent heat of phase transition. The change of thermal conductivity and specific heat capacity with temperature is manifested in two stages, and decreases rapidly in the temperature range from 0 ℃ to -10 ℃ and then becomes stable. The established orthogonal spherical contact heat conduction model can calculate the amount of unfrozen water at any time and predict the change trend of thermal physical parameters, which can provide reference for reducing the measurement workload of thermal physical parameters in freezing work.

References:

[1] 骆维斌,乔 雄,倪伟淋,等.隧道新型装配式临时支撑结构研发及技术研究[J].建筑科学与工程学报,2022,39(5):262-273.
LUO Weibin,QIAO Xiong,NI Weilin,et al.Development and technical research of new prefabricated temporary support structure for tunnel[J].Journal of Architecture and Civil Engineering,2022,39(5):262-273.
[2]邓 碧,张俊伟,诸葛绪松,等.软土地层并行曲线隧道施工顺序对既有隧道的影响[J].建筑科学与工程学报,2021,38(6):170-176.
DENG Bi,ZHANG Junwei,ZHUGE Xusong,et al.Influence of construction sequence of parallel curved tunnels on existing tunnels in soft soil stratum[J].Journal of Architecture and Civil Engineering,2021,38(6):170-176.
[3]张立鑫,陈丽俊,陈建勋,等.单斜构造软硬互层围岩隧道变形特征及控制对策[J].建筑科学与工程学报,2021,38(6):186-196.
ZHANG Lixin,CHEN Lijun,CHEN Jianxun,et al.Deformation characteristics and treatment measures of tunnels in soft and hard interbedded surrounding rock with tilted stratum[J].Journal of Architecture and Civil Engineering,2021,38(6):186-196.
[4]鲁先龙,陈湘生,陈 曦.人工地层冻结法风险预控[J].岩土工程学报,2021,43(12):2308-2314.
LU Xianlong,CHEN Xiangsheng,CHEN Xi.Risk prevention and control of artificial ground freezing(AGF)[J].Chinese Journal of Geotechnical Engineering,2021,43(12):2308-2314.
[5]刘志强,洪伯潜,龙志阳.矿井建设科研成就60年[J].建井技术,2017,38(5):1-6.
LIU Zhiqiang,HONG Boqian,LONG Zhiyang.60 years science and research achievements of mine construction[J].Mine Construction Technology,2017,38(5):1-6.
[6]HU X D,DENG S J.Ground freezing application of intake installing construction of an underwater tunnel[J].Procedia Engineering,2016,165:633-640.
[7]刘志强.矿井建设技术发展概况及展望[J].煤炭工程,2018,50(6):44-46,50.
LIU Zhiqiang.Overview and outlook on development of mine construction technologies[J].Coal Engineering,2018,50(6):44-46,50.
[8]汪仁和,王 伟.冻结孔偏斜下冻结壁温度场的形成特征与分析[J].岩土工程学报,2003,25(6):658-661.
WANG Renhe,WANG Wei.Analysis for features of the freezing temperature field under deflective pipes[J].Chinese Journal of Geotechnical Engineering,2003,25(6):658-661.
[9]张 婷,杨 平,王效宾.浅表土人工冻土冻胀特性的研究[J].南京林业大学学报(自然科学版),2010,34(4):65-68.
ZHANG Ting,YANG Ping,WANG Xiaobin.Experimental research on the frost heave behavior of shallow top soil[J].Journal of Nanjing Forestry University(Natural Science Edition),2010,34(4):65-68.
[10]KOZLOWSKI T.Soil freezing point as obtained on melting[J].Cold Regions Science and Technology,2004,38(2/3):93-101.
[11]KURYLYK B L,WATANABE K.The mathematical representation of freezing and thawing processes in variably-saturated,non-deformable soils[J].Advances in Water Resources,2013,60:160-177.
[12]WATANABE K,OSADA Y.Simultaneous measurement of unfrozen water content and hydraulic conductivity of partially frozen soil near 0 ℃[J].Cold Regions Science and Technology,2017,142:79-84.
[13]KOZLOWSKI T,NARTOWSKA E.Unfrozen water content in representative bentonites of different origin subjected to cyclic freezing and thawing[J].Vadose Zone Journal,2013,12(1):1-11.
[14]CHAI M T,ZHANG J M,ZHANG H,et al.A method for calculating unfrozen water content of silty clay with consideration of freezing point[J].Applied Clay Science,2018,161:474-481.
[15]MU Q,NG C,ZHOU C,et al.A new model for capturing void ratio-dependent unfrozen water characteristics curves[J].Computers and Geotechnics,2018,101:95-99.
[16]ZHOU J Z,WEI C F,LAI Y M,et al.Application of the generalized Clapeyron equation to freezing point depression and unfrozen water content[J].Water Resources Research,2018,54(11):9412-9431.
[17]TARNAWSKI V R,GORI F.Enhancement of the cubic cell soil thermal conductivity model[J].International Journal of Energy Research,2002,26(2):143-157.
[18]TARNAWSKI V R,LEONG W H.Thermal conductivity of soils at very low moisture content and moderate temperatures[J].Transport in Porous Media,2000,41(2):137-147.
[19]DONG Y,MCCARTNEY J S,LU N.Critical review of thermal conductivity models for unsaturated soils[J].Geotechnical and Geological Engineering,2015,33(2):207-221.
[20]SADEGHI M,GHANBARIAN B,HORTON R.Derivation of an explicit form of the percolation-based effective-medium approximation for thermal conductivity of partially saturated soils[J].Water Resources Research,2018,54(2):1389-1399.
[21]张 涛,刘松玉,张 楠,等.土体热传导性能及其热导率模型研究[J].建筑材料学报,2019,22(1):72-80.
ZHANG Tao,LIU Songyu,ZHANG Nan,et al.Research of soil thermal conduction properties and its thermal conductivity model[J].Journal of Building Materials,2019,22(1):72-80.
[22]JOHANSEN O.Thermal conductivity of soils[D].Trondheim:University of Trondheim,1975.
[23]原喜忠,李 宁,赵秀云,等.非饱和(冻)土导热系数预估模型研究[J].岩土力学,2010,31(9):2689-2694.
YUAN Xizhong,LI Ning,ZHAO Xiuyun,et al.Study of thermal conductivity model for unsaturated unfrozen and frozen soils[J].Rock and Soil Mechanics,2010,31(9):2689-2694.

Memo

Memo:
-
Last Update: 2023-12-01