Dynamic behaviors of water-saturated and frozen sandstone subjected to freeze-thaw cycles
作者机构：School of Resources and Safety EngineeringCentral South UniversityChangsha410083China Research Center for Mining Engineering and Technology in Cold RegionsCentral South UniversityChangsha410083China Department of Aerospace and Mechanical EngineeringThe University of ArizonaTucsonAZ85721USA
出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)
年 卷 期：2023年第15卷第6期
页 面：1476-1490页
核心收录：
学科分类：081401[工学-岩土工程] 08[工学] 0818[工学-地质资源与地质工程] 0814[工学-土木工程]
基 金：supported by the Hunan Provincial Natural Science Foundation of China(Grant No.2020JJ4704) the Fundamental Research Funds for the Central Universities of Central South University,China(Grant Nos.2021zzts0881 and 2021zzts0279)
主 题：Freeze-thaw(F-T)cycle damage Dynamic properties Split Hopkinson pressure bar(SHPB) Increasing rate of porosity
摘 要：In high-altitude cold areas,freeze-thaw(F-T)cycles induced by day-night and seasonal temperature changes cause numerous rock mass slope engineering *** investigate the dynamic properties of rock in the natural environment of a high-altitude cold area,standard specimens were drilled from the slope of the Jiama copper mine in Tibet,and dynamic compression tests were performed on watersaturated and frozen sandstone with different numbers of F-T cycles(0,10,20,30,and 40)by the split Hopkinson pressure bar(SHPB)system with a cryogenic control *** influence of water-saturated and frozen conditions on the dynamic performance of sandstone was *** following conclusions are drawn:(1)With increasing strain rate,the attenuation factor(la)of water-saturated sandstone and the intensifying factor(li)of frozen sandstone linearly *** the number of F-T cycles increases,the dependence factor(ld)of water-saturated sandstone linearly decreases,whereas the ld of frozen sandstone linearly increases.(2)The prediction equation of the dynamic compressive strength of water-saturated and frozen sandstone is obtained,which can be used to predict the dynamic compressive strength of sandstone after various F-T cycles based on the strain rate.(3)The mesoscopic mechanism of water-saturated and frozen sandstone’s dynamic compressive strength evolution is *** water softening effect causes the dynamic compressive strength of water-saturated sandstone to decrease,whereas the strengthening effect of pore ice causes it to increase.(4)The decrease in the relative dynamic compressive strength of water-saturated sandstone and the increase in the relative dynamic compressive strength of frozen sandstone can be attributed to the increased porosity.
维普期刊数据库