花岗岩非稳态传热破坏过程能量演变规律研究  

Energy evolution pattern in destructive process of unsteady state heat transfer in granite

作　　者：贾鹏[1] 郤保平[1,2] 李晓科 解瑾 蔡佳豪 高鹏利 JIA Peng;XI Bao-ping;LI Xiao-ke;XIE Jin;CAI Jia-hao;GAO Peng-li(College of Mining Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;Key Laboratory of In-situ Property Improving Mining of Ministry of Education,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)

机构地区：[1]太原理工大学矿业工程学院,山西太原030024 [2]太原理工大学原位改性采矿教育部重点实验室,山西太原030024

出　　处：《岩土力学》2024年第10期3013-3023,3036,共12页Rock and Soil Mechanics

基　　金：国家自然科学基金面上项目(No.51874207);山西省自然科学基金(No.202303021211042,No.202303011222006)。

摘　　要：热作用下花岗岩损伤的定量描述是个亟待解决的问题。从能量角度出发,对600℃范围内高温花岗岩试件非稳态传热过程的温度状态进行测定,借助冷却法分析了花岗岩正规状况阶段热物理参数演变规律,讨论了花岗岩非稳态传热过程能量吸收、释放及耗散特性,揭示了热作用下花岗岩性能损伤与能量演变规律的内在联系。结果表明:不同高温状态下的花岗岩试件自然冷却时正规状况阶段比热变化分两个阶段,分别为比热平稳变化阶段与比热大幅变化阶段;随着初始高温状态的降低,整个非稳态传热过程中所耗散的能量也在随之降低,且在同一冷却模式下,输入的能量越大,耗散能所占比例也越大;非稳态传热过程中耗散能的大小与高温热作用后花岗岩宏观力学性能的劣化有较强的相关性,耗散能的大小与最大热冲击因子有显著的线性关系。Quantitatively characterizing damage in granite under thermal conditions is a significant challenge.This study approaches the issue from an energetic perspective by measuring the temperature during the unsteady-state heat transfer process of granite specimens at elevated temperatures,specifically within the range of 600°C.The evolution of thermophysical parameters during the regular state stage was systematically analyzed using a cooling method.This investigation explores the characteristics of granite undergoing unsteady state heat transfer,focusing on energy absorption,release,and dissipation.It reveals the intrinsic connection between performance damage and energy evolution laws of granite under thermal action.The findings reveal that granite specimens in different high-temperature states undergo natural cooling in two distinct phases of specific heat change during the regular state stage:steady change and significant change in specific heat.As the initial high-temperature state decreases,the energy dissipated during the whole unsteady state heat transfer process also decreases.In the same cooling mode,the larger the input energy,the larger the proportion of dissipated energy.The amount of dissipated energy in the unsteady state heat transfer process strongly correlates with the deterioration of the macro-mechanical parameters of granite after high-temperature thermal action.The amount of the dissipated energy and the maximum thermal shock factor have a significant linear relationship.

关 键 词：岩石力学 非稳态传热 能量释放 能量耗散 比热 

分 类 号：TU45[建筑科学—岩土工程]