A novel shear damage model of the shear deformation and failure process of gas hydrate-bearing sediments  

作　　者：Hui WANG Bo ZHOU 

机构地区：[1]College of Pipeline and Civil Engineering,China University of Petroleum(East China),Qingdao 266580,China [2]Institute of Water Engineering Sciences,Wuhan University,Wuhan 430072,China

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2025年第2期151-165,共15页浙江大学学报(英文版)A辑(应用物理与工程)

基　　金：supported by the Independent Innovation Research Program of China University of Petroleum(East China)(No.27RA2215005)。

摘　　要：A novel shear damage model based on homogenization theory and a modified Mohr-Coulomb criterion is proposed to predict the full deformation process of gas hydrate-bearing sediments(GHBSs)during shearing by analyzing micro-mechanisms of shear deformation and failure characteristics.Then,the physical significance of the model's parameters is explored.Finally,the damage evolution and shear stress partition inside GHBSs during the shearing process are analyzed in detail.The results show that model parameters have clear physical meaning,and the shear damage model is capable of reflecting the nonlinear deformation and strain softening characteristics of GHBSs due to its ability to better describe the damage evolution and shear stress partition mechanisms inside GHBSs during the shearing process.Comparisons of experimental and theoretical results show that the global performance of the novel shear damage model is satisfactory.The model is expected to be widely adopted to analyze submarine landslide instability due to hydrate dissociation.

关 键 词：Gas hydrate-bearing sediments(GHBSs) Shear damage model Homogenization theory Modified Mohr-Coulomb(MC)criterion Damage evolution 

分 类 号：TG1[金属学及工艺—金属学]