辽宁工程技术大学学报（自然科学版）2025，Vol.44Issue(3)：293-302,10.DOI:10.11956/j.issn.1008-0562.20240301
基于XT-DIC的冻融裂隙砂岩裂纹扩展规律及损伤演化特征
Crack propagation law and damage evolution characteristics of freeze-thaw fractured sandstone based on XT-DIC
摘要
Abstract
Aiming at the problem that rock mechanical properties in cold regions are prone to deterioration under freeze-thaw cycle,the intact sandstone specimens and the prefabricated sandstone specimens with crack inclination angles of 0°,45° and 90°,respectively,were studied by combining uniaxial compression test and three-dimensional XT-digital image correlation(XT-DIC)to analyze their mechanical behaviors and failure characteristics after freeze-thaw damage.The research results indicate that prefabricated cracks and freeze-thaw cycles significantly degrade the mechanical properties of sandstone,and the cumulative damage of freeze-thaw specimens lags significantly behind that of unfrozen specimens.The peak strength is linearly negatively correlated with the number of freeze-thaw cycles,the apparent stiffness is exponentially negatively correlated with the number of freeze-thaw cycles,and the time required for crack propagation is positively correlated with the number of freeze-thaw cycles.The evolution of crack principal strain under uniaxial compression goes through three stages:approximate horizontal variation,slow growth,and rapid growth.The final failure mode of the specimen is mainly affected by the pre-crack inclination angle.The research results can provide reference for rock mass engineering design in cold regions.关键词
冻融循环/单轴压缩/预制裂隙砂岩/数字图像技术/裂纹扩展规律/损伤演化特征Key words
freeze-thaw cycle/uniaxial compression/pre-cracked sandstone/digital image correlation/crack propagation law/damage evolution mechanism分类
矿业与冶金引用本文复制引用
张春阳,胡凯兵,赵尔丞,谭涛..基于XT-DIC的冻融裂隙砂岩裂纹扩展规律及损伤演化特征[J].辽宁工程技术大学学报（自然科学版）,2025,44(3):293-302,10.基金项目
国家自然科学基金项目(52174088) （52174088）
