Surface crack evolution patterns in freeze-thaw damage of fissured rock bodies

作     者：KANG Zhiqiang WANG Zhilei SHAO Luhang FENG Jiangjiang YAO Xulong KANG Zhiqiang;WANG Zhilei;SHAO Luhang;FENG Jiangjiang;YAO Xulong

作者机构：College of Mining EngineeringNorth China University of Science and TechnologyTangshan 063200China Green Intelligent Mining Technology Innovation Center of Hebei ProvinceNorth China University of Science and TechnologyTangshan 063210China Luannan Macheng Mining Co.Ltd.Shougang Group Co.LtdLuannan CountyTangshan 063500China 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2024年第21卷第9期

页      面：3094-3107页

核心收录：

学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(Project No.52074123) 

主　　题：Freeze‒thaw cycles Fissured sandstone Particle flow software Rock mechanics Crack extension pattern DIC technique 

摘      要：To explore the effects of freeze‒thaw cycles on the mechanical properties and crack evolution of fissured sandstone,biaxial compression experiments were carried out on sandstone subjected to freeze‒thaw cycles to characterize the changes in the physical and mechanical properties of fissured sandstone caused by freeze‒thaw *** crack evolution and crack change process on the surface of the fissured sandstone were recorded and analysed in detail via digital image technology(DIC).Numerical simulation was used to reveal the expansion process and damage mode of fine-scale cracks under the action of freeze‒thaw cycles,and the simulation results were compared and analysed with the experimental data to verify the reliability of the numerical *** results show that the mass loss,porosity,peak stress and elastic modulus all increase with increasing number of freeze‒thaw *** an increase in the number of freeze‒thaw cycles,a substantial change in displacement occurs around the prefabricated cracks,and a stress concentration appears at the crack *** new cracks continue to sprout at the tips of the prefabricated cracks until the microcracks gradually penetrate into the main cracks,the displacement cloud becomes obviously discontinuous,and the contours of the displacement field in the crack fracture damage area simply intersect with the prefabricated cracks to form an obvious *** damage patterns of the fractured sandstone after freeze‒thaw cycles clearly differ,forming a symmetricalL-shaped damage pattern at zero freeze‒thaw cycles,a symmetricalV-shaped damage pattern at 10 freeze‒thaw cycles,and aV-shaped damage pattern at 20 freeze‒thaw *** 20 freeze‒thaw cycles,aV-shaped destruction pattern andL-shaped destruction pattern are formed;after 30 freeze‒thaw cycles,anN-shaped destruction pattern is *** shows that the failure mode of fractured sandstone gradually becomes more complicated with an increasing number of freeze‒t