文献类型：期刊文献

中文题名：Two-step numerical analysis of thermal stress in fractured granite under complex laboratory heating conditions

作者：Dong-Joon Youn Changlun Sun Li Zhuang

第一作者：Dong-Joon Youn

机构：[1]Korea Electric Power Research Institute,Daejeon,South Korea;[2]School of Mining Engineering,Guizhou Institute of Technology,Guizhou,China;[3]School of Resources and Safety Engineering,Chongqing University,Chongqing,China

第一机构：Korea Electric Power Research Institute,Daejeon,South Korea

年份：2025

卷号：1

期号：3

起止页码：213-227

中文期刊名：Earth Energy Science

外文期刊名：地球能源科学(英文)

基金：supported by the International Collaborative Research Program(fundamental research,2021-2023);funded by Korea Institute of Civil Engineering and Building Technology.L.Zhuang was financially supported under grant CSTB2024YCJH-KYXM0092;startup funding from the National Natural Science Foundation of China.

语种：英文

中文关键词：Granite;Heating experiment;Thermal stress;Thermo-mechanical coupling;Deep geological repository

摘要：For the purpose of understanding how heat and thermal stress are generated in fractured granite in the context of a high-level radioactive waste repository,laboratory heating experiments on cubic specimens were designed using a polyaxial testing equipment.Heat conduction along the heated surfaces rapidly increases the temperature,while significant thermal energy is lost through other surfaces due to air convection and conduction into the loading machine.To simplify thermal-mechanical coupling analysis on fractured rock with particular focus on precise prediction of thermal stress,a two-step numerical analysis is proposed.First,a three-dimensional finite element-based model is used to numerically reproduce the heating experiment,and the model is validated through comparisons of spatial-temporal evolution of temperature.Second,an integrated model is developed to investigate thermal stresses in fractured rock masses with different fracture properties,for the given heating conditions.The most crucial factors influencing the heating experiment are analyzed and summarized.In addition,local temperature and stress fields in a sawcut and a rough fracture are compared based on numerical modeling results,and the thermal stress heterogeneity in rough fractures is analyzed.