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直剪过程中砂岩渐进损伤及渗透演化的离散元模拟 被引量:6

DEM simulation of progressive damage and permeability evolution of sandstone during direct-shearing
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摘要 为探究砂岩在直剪作用过程中的渐进损伤和渗透演化规律,在物理试验的基础上,采用离散元软件PFC^(2D)建立砂岩试样的颗粒流数值模型,开展4种不同法向应力条件下的直剪渗流数值模拟研究,讨论砂岩在直接剪切破坏过程中的细观裂纹扩展规律、能量耗散机制以及渗透率演化特征。结果表明:(1)直剪过程中,细观裂纹表现出由萌生、扩展、合并、连接、形核到最终形成宏观贯通剪切带的渐进特征,破坏产生的裂纹总数随着法向应力的增大而增加。(2)峰前阶段输入的总能量主要以颗粒间黏结键应变能的形式储存,峰后阶段耗散能快速增加,最终岩样破坏时的耗散能接近总能量的40%。(3)直剪作用下岩样渗透率的变化受控于内部优势渗流通道,渗透率的突增是剪切过程中“孔隙流”转化为“裂隙流”的表现。 In order to investigate progressive damage and permeability evolution of sandstone under directshearing conditions,a group of numerical models based on physical experiments are established using the particle flow code in two-dimension(PFC^(2D)).Four different levels of normal stresses are set to discuss meso-crack propagation features,energy dissipation mechanism,and permeability evolution characteristics of sandstone in the process of direct-shearing.The results show that the mesoscopic cracks gradually expanding,merging,connecting,nucleating,and finally forming an obvious macroscopic shear band,and the total number of cracks after failure increases with the increase of the normal stress.In addition,the total energy input in the pre-peak stage is mainly stored in the form of the strain energy of interparticle bonding bonds,and the dissipated energy increases rapidly in the post-peak stage.The dissipated energy is close to 40%of the total energy when the numerical rock samples fail completely.Furthermore,the permeability variation is governed by the preferred seepage channels in the rock sample,and the sudden increase of permeability is the manifestation of the transformation of“pore flow”into“fracture flow”during direct shearing process.
作者 陈旭 余飞阳 汤明高 肖义 曾鹏 钟志彬 CHEN Xu;YU Feiyang;TANG Minggao;XIAO Yi;ZENG Peng;ZHONG Zhibin(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu,Sichuan 610059,China;College of Environment and Civil Engineering,Chengdu University of Technology,Chengdu,Sichuan 610059,China)
出处 《岩石力学与工程学报》 EI CAS CSCD 北大核心 2024年第S01期3161-3174,共14页 Chinese Journal of Rock Mechanics and Engineering
基金 国家自然科学基金资助项目(42107208,51808458) 四川省科技计划(应用基础研究)(2021YJ0394)
关键词 岩石力学 直剪试验 渐进损伤 渗透演化 颗粒流 离散元 rock mechanics direct-shear test progressive damage permeability evolution particle flow code discrete element method
作者简介 陈旭(1988-),男,2019年毕业于东北大学采矿工程专业,现任副教授、硕士生导师,主要从事岩石损伤力学及渗流特性方面的教学与研究工作。E-mail:chenxu@cdut.edu.cn;通讯作者:汤明高(1978-),男,现任教授、博士生导师。E-mail:tomyr2008@163.com
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