单向冻结时开放条件下饱和砂岩冻胀试验及THM耦合冻胀模型

吕志涛; 夏才初; 李强; 王岳嵩

doi:10.11779/CJGE201908007

单向冻结时开放条件下饱和砂岩冻胀试验及THM耦合冻胀模型 English Version

吕志涛^1,2,
夏才初^1,2, ,,
李强^1,2,
王岳嵩^1,2

1. 同济大学土木工程学院地下建筑与工程系,上海 200092;
2. 同济大学岩土及地下工程教育部重点实验室,上海 200092

基金项目: 国家自然科学基金项目（41472248,51778475）

详细信息

作者简介:
吕志涛(1990— ),男,博士研究生,主要从事寒区岩体力学及寒区工程方面的研究工作。E-mail: lvzhitao90@126.com。

通讯作者:
夏才初，E-mail：tjxiaccb@126.com

中图分类号: TU45
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出版历程
- 收稿日期: 2018-07-01
- 发布日期: 2019-08-24

Frost heave experiments on saturated sandstone under unidirectional freezing conditions in an open system and coupled THM frost heave model

1. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China;
2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China

摘要

摘要: 为研究寒区岩石在梯度温度场中补水条件下的冻胀变形规律,进行了单向冻结时开放条件下饱和砂岩冻胀试验。试验结果表明,单向冻结时开放条件下饱和岩石冻胀过程中,沿冻结方向的冻胀位移变化过程可分为冷缩阶段、原位冻胀阶段、分凝冻胀阶段3个阶段。分凝冻胀阶段冻结锋面趋于稳定,冻胀变形持续增长,与时间基本呈线性关系。此外,分凝冻胀阶段补水量换算的迁移水分凝冻胀位移与冻结方向冻胀位移比较接近。随着平均温度梯度增大,分凝冻胀变形速率增大,且分凝冰位置与平均温度梯度线性相关。然后,建立了考虑孔隙水原位冻胀与迁移水分凝冻胀的THM耦合冻胀模型。模型中,孔隙水原位冻胀计算基于未冻水含量,并引入约束系数表征岩石骨架对孔隙水冻胀约束程度;迁移水分凝冻胀计算基于分凝势理论,水分迁移速率与冻结缘处的温度梯度成正比。模型计算结果与试验结果对比表明,建立的THM耦合冻胀模型能够比较准确地计算单向冻结时开放条件下饱和岩石冻胀位移,并能够模拟出分凝冻胀时分凝冰层引起的位移突变及分凝冰位置,可用于寒区冻胀敏感性岩石开放条件下冻胀变形计算。
- 岩石 /
- 冻胀试验 /
- 开放条件 /
- 分凝冻胀 /
- THM耦合冻胀模型
Abstract: To study the frost heave of rocks in cold regions under temperature gradient with water supply, the frost heave experiments on saturated sandstone under unidirectional freezing conditions are conducted in an open system. The results show that the variation process of the frost heave parallel to freezing direction can be divided into three stages during the freezing process of rocks under unidirectional freezing conditions in an open system, namely, thermal contraction stage, in-situ frost heave stage, and segregation frost heave stage. During the segregation frost heave stage, the frost front tends to be stable, and the frost heave increases continuously in an approximately linear relationship with time. Moreover, the frost heave calculated by water migration amount is close to the measured frost heave parallel to freezing direction during the segregation frost heave stage. The segregation frost heave rate increases with the increase of the average temperature gradient, and the location of the segregation ice is in a linear relationship with the average temperature gradient. Furthermore, a coupled THM frost heave model considering the in-situ frost heave of pore water and the segregation frost heave of migrating water is proposed. In the model, the calculation of the in-situ frost heave is based on the unfrozen water content, and a constraint coefficient is introduced to consider the constraint extent of the rock skeleton to the frost heave of the pore ice. Besides, the calculation of the segregation frost heave is based on the segregation potential theory. Comparisons between the experimental and calculated results show that the proposed THM frost heave model is reliable to calculate the frost heave of rocks under unidirectional freezing conditions in an open system, and to simulate the displacement mutation due to segregation ice layer. Therefore, the proposed THM frost heave model is applicable to the frost heave calculation of rock with frost susceptibility in cold regions.
- rock /
- frost heave experiment /
- open system /
- segregation frost heave /
- coupled THM frost heave model

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参考文献(25)

[1]	张俊儒, 仇文革. 昆仑山隧道冻胀力现场测试及其数据分析[J]. 岩土力学, 2006, 27(增刊1): 564-568. (ZHANG Jun-ru, QIU Wen-ge.In-situ test and data analysis of frost-heave force of Kunlun Mountain Tunnel[J]. Rock and Soil Mechanics, 2006, 27(S1): 564-568. (in Chinese))
[2]	陶履彬. 岩石冻胀性与其含水率关系的试验研究[C]//第一届华东岩土工程学术大会论文集. 无锡, 1990: 387-396. (TAO Lü-bing.Experimental study of the relationship between the frost heave ratio and the water content of the rock[C]// Proceedings of the First Session of the East China Geotechnical Conference. Wuxi, 1990: 387-396. (in Chinese))
[3]	康永水, 刘泉声, 赵军, 等. 岩石冻胀变形特征及寒区隧道冻胀变形模拟[J]. 岩石力学与工程学报, 2012, 31(12): 2518-2526. (KANG Yong-shui, LIU Quan-sheng, ZHAO Jun, et al.Research on frost deformation characteristics of rock and simulation of tunnel frost deformation in cold region[J]. Chinese Journal of Rock Mechanics and Engineering, 2012, 31(12): 2518-2526. (in Chinese))
[4]	MELLOR M.Phase composition of pore water in cold rocks[R]. Hanover: Cold Regions Research and Engineering Laboratory, 1970.
[5]	夏才初, 黄继辉, 韩常领, 等. 寒区隧道岩体冻胀率的取值方法和冻胀敏感性分级[J]. 岩石力学与工程学报, 2013, 32(9): 1876-1885. (XIA Cai-chu, HUANG Ji-hui, HAN Chang-ling, et al.Evaluation of the frost-heave ratio and classification of the frost heave susceptibility for rock mass around cold region tunnel[J]. Chinese Journal of Rock Mechanics and Engineering, 2013, 32(9): 1876-1885. (in Chinese))
[6]	MATSUOKA N.Mechanisms of rock breakdown by frost action:an experimental approach[J]. Cold Regions Science and Technology, 1990, 17(3): 253-270.
[7]	刘泉声, 黄诗冰, 康永水, 等. 低温饱和岩石未冻水含量与冻胀变形模型研究[J]. 岩石力学与工程学报, 2016, 35(10): 2000-2012. (LIU Quan-sheng, HUANG Shi-bing, KANG Yong-shui, et al.Study of unfrozen water content and frost heave model for saturated rock under low temperature[J]. Chinese Journal of Rock Mechanics and Engineering, 2016, 35(10): 2000-2012. (in Chinese))
[8]	LÜ Z, XIA C, LI Q.Experimental and numerical study on frost heave of saturated rock under uniform freezing conditions[J]. Journal of Geophysics and Engineering, 2018, 15(2): 593-612.
[9]	夏才初, 李强, 吕志涛, 等. 各向均匀与单向冻结条件下饱和岩石冻胀变形特性对比试验研究[J]. 岩石力学与工程学报, 2018, 37(2): 274-281. (XIA Cai-chu, LI Qiang, LÜ Zhi-tao, et al.Comparative experimental study on frost deformation characteristics of saturated rock under uniform freezing and uni-directional freezing conditions[J]. Chinese Journal of Rock Mechanics and Engineering, 2018, 37(2): 274-281. (in Chinese))
[10]	AKAGAWA S, FUKUDA M.Frost heave mechanism in welded tuff[J]. Permafrost and Periglacial Processes, 1991, 2(4): 301-309.
[11]	HALLET B, WALDER J, STUBBS C.Weathering by segregation ice growth in microcracks at sustained subzero temperatures: verification from an experimental study using acoustic emissions[J]. Permafrost and Periglacial Processes, 1991, 2(4): 283-300.
[12]	MURTON J, COUTARD J, LAUTRIDOU J, et al.Physical modelling of bedrock brecciation by ice segregation in permafrost[J]. Permafrost and Periglacial Processes, 2001, 12(3): 255-266.
[13]	MURTON J, PETERSON R, OZOUF J.Bedrock fracture by ice segregation in cold regions[J]. Science, 2006, 314: 1127-1129.
[14]	AKAGAWA S, SATOH M, KANIE S, et al.Effect of tensile strength on ice lens initiation temperature[C]//Cold Regions Engineering 2006. Orono, 2006: 1-12.
[15]	NAKAMURA D, GOTO T, SUZUKI T, et al.Basic study on the frost heave pressure of rocks: dependence of the location of frost heave on the strength of the rock[C]//Cold Regions Engineering 2012: Sustainable Infrastructure Development in a Changing Cold Environment. Quebec City, 2012: 124-133.
[16]	NEAUPANE K, YAMABE T, YOSHINAKA R.Simulation of a fully coupled thermo-hydro-mechanical system in freezing and thawing rock[J]. International Journal of Rock Mechanics and Mining Sciences, 1999, 36(5): 563-580.
[17]	KANG Y, LIU Q, HUANG S.A fully coupled thermo-hydro- mechanical model for rock mass under freezing/thawing condition[J]. Cold Regions Science and Technology, 2013, 95: 19-26.
[18]	DUCA S, ALONSO E, SCAVIA C.A permafrost test on intact gneiss rock[J]. International Journal of Rock Mechanics and Mining Sciences, 2015, 77: 142-151.
[19]	EVERETT D.The thermodynamics of frost damage to porous solids[J]. Transactions of the Faraday Society, 1961, 57: 1541-1551.
[20]	O’NEILL K, MILLER R. Exploration of a rigid ice model of frost heave[J]. Water Resources Research, 1985, 21(3): 281-296.
[21]	KONRAD J.Sixteenth Canadian Geotechnical Colloquium: Frost heave in soils: concepts and engineering[J]. Canadian Geotechnical Journal, 1994, 31(2): 223-245.
[22]	ZHOU J, WEI C, WEI H, et al. Experimental and theoretical characterization of frost heave and ice lenses[J]. Cold Regions Science and Technology, 2014, 104/105: 76-87.
[23]	TAN X, CHEN W, TIAN H, et al.Water flow and heat transport including ice/water phase change in porous media: Numerical simulation and application[J]. Cold Regions Science and Technology, 2011, 68(1/2): 74-84.
[24]	MICHALOWSKI R, ZHU M.Frost heave modelling using porosity rate function[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2006, 30(8): 703-722.
[25]	KONRAD J.Prediction of freezing-induced movements for an underground construction project in Japan[J]. Canadian Geotechnical Journal, 2002, 39(6): 1231-1242.