Effect of cyclic wetting-drying on tensile mechanical behavior and microstructure of clay-bearing sandstone
Pingye Guo1
Juan Gu2
Yi Su1
Jiong Wang1
Zhanwen Ding3
1.State Key Laboratory for Geo-Mechanics and Deep Underground Engineering,Beijing 100083,China;School of Mechanics,Architecture and Civil Engineering,China University of Mining and Technology,Beijing 100083,China2.Tang Steel International Engineering Technology Corp,Tangshan 063000,China3.China Henan Geological and Mineral Resources Construction Engineering (Group) Co.,Ltd,Zhengzhou 450007,China
摘要：The understanding of the weakening mechanism of tensile strength of rock subjected to cyclic wetting-drying is critical for rock engineering.Tensile strength tests were conducted on a total of 35 sandstone specimens with different wetting-drying cycles.The crack propagation process and acoustic emission characteristics of the tested samples were obtained through a high-speed camera and acoustic emission system.The 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 wetting-drying cycle,but also closely related to the clay mineral content of the sample.In addition,as the cycles of wetting-drying increase,the effect of each single cycle on tensile strength get reduced until it becomes constant.Moreover,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 sandstone.Meanwhile,the acoustic emission characteristics of the tested samples further confirmed the ductile behaviour of the sandstone samples with increasing wetting-drying cycle.Furthermore,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.
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论文发表日期：2021-10-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：13( 956-968 )
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