A coupled cryogenic thermo-hydro-mechanical model for frozen medium:Theory and implementation in FDEM  

作　　者：Lei Sun Xuhai Tang Kareem Ramzy Aboayanah Qi Zhao Quansheng Liu Giovanni Grasselli 

机构地区：[1]Department of Civil and Mineral Engineering,University of Toronto,Toronto,ON,M5S 1A4,Canada [2]School of Civil Engineering,Wuhan University,Wuhan,430072,China [3]Department of Civil and Environmental Engineering,The Hong Kong Polytechnic University,Hung Hom,Hong Kong,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第11期4335-4353,共19页岩石力学与岩土工程学报（英文）

基　　金：supported by the Natural Sciences and Engineering Research Council of Canada (NSERC)Discovery Grants 341275,NSERC CRDPJ 543894-19,and NSERC/Energi Simulation Industrial Research Chair program;funding he received from Lassonde International Graduate Scholarship in Mining at the University of Toronto;supported by the FCE Start-up Fund for New Recruits at the Hong Kong Polytechnic University (P0034042);the Early Career Scheme and the General Research Fund Scheme of the Research Grants Council of the Hong Kong SAR,China (Project Nos.PolyU 25220021 and PolyU 15227222).

摘　　要：This paper presents the development of a coupled modeling approach to simulate cryogenic thermo-hydro-mechanical(THM)processes associated with a freezing medium,which is then implemented in the combined finite-discrete element method code(FDEM)for multi-physics simulation.The governing equations are deduced based on energy and mass conservation,and static equilibrium equations,considering water/ice phase change,where the strong couplings between multi-fields are supplemented by critical coupling parameters(e.g.unfrozen water content,permeability,and thermal conductivity).The proposed model is validated against laboratory and field experiments.Results show that the cryogenic THM model can well predict the evolution of strongly coupled processes observed in frozen media(e.g.heat transfer,water migration,and frost heave deformation),while also capturing,as emergent properties of the model,important phenomena(e.g.latent heat,cryogenic suction,ice expansion and distinct three-zone distribution)caused by water/ice phase change at laboratory and field scales,which are difficult to be all revealed by existing THM models.The novel modeling framework presents a gateway to further understanding and predicting the multi-physical coupling behavior of frozen media in cold regions.

关 键 词：Thermo-hydro-mechanical(THM)coupling Low temperature Heat transfer Water migration Frost heave Combined finite-discrete element method(FDEM) 

分 类 号：P314[天文地球—固体地球物理学]