Effect of cyclic wetting-drying on tensile mechanical behavior and microstructure of clay-bearing sandstone
作者机构：State Key Laboratory for Geo-Mechanics and Deep Underground EngineeringBeijing 100083China School of MechanicsArchitecture and Civil EngineeringChina University of Mining and TechnologyBeijing 100083China Tang Steel International Engineering Technology CorpTangshan 063000China China Henan Geological and Mineral Resources Construction Engineering(Group)Co.LtdZhengzhou 450007China
出 版 物：《International Journal of Coal Science & Technology》 (国际煤炭科学技术学报（英文）)
年 卷 期：2021年第8卷第5期
页 面：956-968页
核心收录：
学科分类：081901[工学-采矿工程] 0819[工学-矿业工程] 08[工学]
基 金：Funding for this work was provided by Natural Science Foundation of China(41941018 41402273) the Yue Qi Scholar Program of China University of Mining and Technology.The authors wish to thank the reviewers for careful and constructive suggestions
主 题：Sandstone Wetting-drying cycle Tensile strength Weakening mechanism Failure characteristics
摘 要：The understanding of the weakening mechanism of tensile strength of rock subjected to cyclic wetting-drying is critical for rock *** strength tests were conducted on a total of 35 sandstone specimens with different wetting-drying *** crack propagation process and acoustic emission characteristics of the tested samples were obtained through a high-speed camera and acoustic emission *** results indicate that the tensile strength is observably reduced after cyclic wetting-drying,and the extent of the reduction is not only related to the number of wettingdrying cycle,but also closely related to the clay mineral content of the *** addition,as the cycles of wetting-drying increase,the effect of each single cycle on tensile strength get reduced until it becomes ***,the crack initiation and penetration time is prolonged as the number of wetting-drying cycle increases,which indicates that cyclic wetting-drying weakens the rock stiffness and enhances the ductility of ***,the acoustic emission characteristics of the tested samples further confirmed the ductile behaviour of the sandstone samples with increasing wetting-drying ***,through the analysis of the microstructure and mineral composition of the samples with different wetting-drying cycles,it is concluded that the main weakening mechanisms of sandstones containing clay minerals are frictional reduction,chemical and corrosive deterioration.
维普期刊数据库