砂岩热物理性质的温度作用效应试验研究

发布时间：2018-04-11 09:50

  本文选题：砂岩 + 高温作用　； 参考：《地质与勘探》2017年04期

【摘要】：高温作用会导致岩石内部结构发生变化,并对其热物理性质有着显著影响。因此,研究高温作用后岩石热物理性质的变化规律对地热系统及存在热流传播问题的地下工程具有指导意义。试验利用高温炉和Hot Disk热常数分析仪研究了高温作用后砂岩热物理性质的变化特征。研究表明:砂岩的热导率、比热、热扩散率随温度整体呈下降趋势,可分为25℃~100℃,100℃~400℃,400℃~600℃,600℃~900℃四个阶段;25℃~100℃,砂岩热导率、比热、热扩散率因附着水蒸发急剧减小;100℃~400℃,砂岩热导率、热扩散率变化平缓,比热因含水量的降低减小得较快;400℃~600℃,砂岩中结晶水、结构水的蒸发及石英的相变导致微裂隙发育、延伸,进而引起热导率、比热、热扩散率持续下降;600℃~900℃,砂岩中矿物发生分解、熔融破裂,热破裂进一步增加与扩展,这个阶段内热导率、比热迅速下降,但热扩散率基本稳定。
[Abstract]:The high temperature will lead to the change of the internal structure of the rock and have a significant influence on the thermal physical properties of the rock.Therefore, the study of the variation of the thermal physical properties of rocks after high temperature action is of great significance to the geothermal system and underground engineering with heat flux propagation problems.The variation characteristics of thermal physical properties of sandstone after high temperature action were studied by means of high temperature furnace and Hot Disk thermal constant analyzer.The thermal diffusivity decreases sharply because of the evaporation of attached water, and the thermal conductivity and thermal diffusivity of sandstone change slowly, and the specific heat decreases rapidly by 400 鈩，

本文编号：1735477