本文選題：砂巖 + 高溫作用　； 參考：《地質(zhì)與勘探》2017年04期

【摘要】：高溫作用會導(dǎo)致巖石內(nèi)部結(jié)構(gòu)發(fā)生變化,并對其熱物理性質(zhì)有著顯著影響。因此,研究高溫作用后巖石熱物理性質(zhì)的變化規(guī)律對地?zé)嵯到y(tǒng)及存在熱流傳播問題的地下工程具有指導(dǎo)意義。試驗(yàn)利用高溫爐和Hot Disk熱常數(shù)分析儀研究了高溫作用后砂巖熱物理性質(zhì)的變化特征。研究表明:砂巖的熱導(dǎo)率、比熱、熱擴(kuò)散率隨溫度整體呈下降趨勢,可分為25℃~100℃,100℃~400℃,400℃~600℃,600℃~900℃四個階段;25℃~100℃,砂巖熱導(dǎo)率、比熱、熱擴(kuò)散率因附著水蒸發(fā)急劇減小;100℃~400℃,砂巖熱導(dǎo)率、熱擴(kuò)散率變化平緩,比熱因含水量的降低減小得較快;400℃~600℃,砂巖中結(jié)晶水、結(jié)構(gòu)水的蒸發(fā)及石英的相變導(dǎo)致微裂隙發(fā)育、延伸,進(jìn)而引起熱導(dǎo)率、比熱、熱擴(kuò)散率持續(xù)下降;600℃~900℃,砂巖中礦物發(fā)生分解、熔融破裂,熱破裂進(jìn)一步增加與擴(kuò)展,這個階段內(nèi)熱導(dǎo)率、比熱迅速下降,但熱擴(kuò)散率基本穩(wěn)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，

本文編號：1735477