砂岩热物理性质的温度作用效应试验研究

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...

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Published in地质与勘探 Vol. 53; no. 4; pp. 780 - 787
Main Author 吕超 孙强 邓舒 张卫强 耿济世
Format Journal Article
LanguageChinese
Published 中国矿业大学资源与地球科学学院,江苏徐州,221116%徐州市国土资源局,江苏徐州,221000 2017
Subjects
比热
热导率
热扩散率
砂岩
高温作用
热扩散率
比热
高温作用
砂岩
热导率
thermal conductivity
thermal diffusivity
sandstone
high temperature
specific heat
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ISSN0495-5331

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Summary: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。
Bibliography:The internal structure and thermal physical properties of rocks can change under high temperature heating. Therefore, the research on the changes of the thermal physical properties of rocks after high temperature heating can provide guidance to the geothermal system and underground engineer- ing associated with heat flow transmission. In this work, we used a hot disk thermal constant analyzer and high temperature furnace to perform an experi- ment to study thermal physical properties of sandstone after high temperature heating. The results show that the therma] conductivity of the sandstone de- creases with the increasing temperature as a whole, which can be divided into four stages： 25℃ to 100℃ , 100℃ to 400℃ ,400℃ to 600℃ and 600℃ to 900℃. The thermal conductivity, specific heat, and thermal diffusivity of the sandstone decrease sharply due to the evaporation of attached water when the temperature rises from 25＂C to 100℃. When the temperature goes up from 100℃ to 400℃ , the thermal conductivity and thermal
ISSN:0495-5331