地质与勘探2017，Vol.53Issue(4)：780-787,8.
砂岩热物理性质的温度作用效应试验研究
An Experimental Study on Thermal Physical Properties of Sandstone Under High-Temperature Heating
摘要
Abstract
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 engineering associated with heat flow transmission.In this work,we used a hot disk thermal constant analyzer and high temperature furnace to perform an experiment to study thermal physical properties of sandstone after high temperature heating.The results show that the thermal conductivity of the sandstone decreases 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℃ to 100℃.When the temperature goes up from 100℃ to 400℃,the thermal conductivity and thermal diffusivity of the sandstone change gently.In contrast,the specific heat decreases quickly because of the reduction of water content.The thermal conductivity,specific heat,and thermal diffusivity of the sandstone decline with the evaporation of crystal water and structure water and phase transition of quartz,leading to the development and extension of micro-fractures after 400℃.In the stage of 600℃ to 900℃,thermal cracking is further intensified and expands due to mineral decomposition and melt rupture in the sandstone.So the thermal conductivity and specific heat of the sandstone decrease rapidly.However,the thermal diffusivity is basically stable when the thermal conductivity and specific heat decline.关键词
砂岩/高温作用/热导率/比热/热扩散率Key words
sandstone/high temperature/thermal conductivity/specific heat/thermal diffusivity分类
天文与地球科学引用本文复制引用
吕超,孙强,邓舒,张卫强,耿济世..砂岩热物理性质的温度作用效应试验研究[J].地质与勘探,2017,53(4):780-787,8.基金项目
国家自然科学基金面上项目(编号:41672279)资助. （编号:41672279）
