2025年7月26日 星期六
岩石力学与工程学报  2024, Vol. 43 Issue (S1): 3161-3174    DOI: 10.13722/j.cnki.jrme.2023.0122
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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
陈  旭1,2,余飞阳2,汤明高1,2,肖  义2,曾  鹏1,2,钟志彬1,2
(1. 成都理工大学 地质灾害防治与地质环境保护国家重点实验室,四川 成都  610059;2. 成都理工大学 环境与土木工程学院,四川 成都  610059)
DEM simulation of progressive damage and permeability evolution of sandstone during direct-shearing
CHEN Xu1,2,YU Feiyang2,TANG Minggao1,2,XIAO Yi2,ZENG Peng1,2,ZHONG Zhibin1,2
(1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu,Sichuan 610059,China;2. College of Environment and Civil Engineering,Chengdu University of Technology,
Chengdu,Sichuan 610059,China)
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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PFC2D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。
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陈 旭1
2
余飞阳2
汤明高1
2
肖 义2
曾 鹏1
2
钟志彬1
2
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    
Abstract:In order to investigate progressive damage and permeability evolution of sandstone under direct- shearing conditions,a group of numerical models based on physical experiments are established using the particle flow code in two-dimension(PFC2D). 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.
Key wordsrock mechanics    direct-shear test    progressive damage    permeability evolution    particle flow code    discrete element method
    
引用本文:   
陈 旭1,2,余飞阳2,汤明高1,2,肖 义2,曾 鹏1,2,钟志彬1,2. 直剪过程中砂岩渐进损伤及渗透演化的离散元模拟[J]. 岩石力学与工程学报, 2024, 43(S1): 3161-3174.
CHEN Xu1,2,YU Feiyang2,TANG Minggao1,2,XIAO Yi2,ZENG Peng1,2,ZHONG Zhibin1,2. DEM simulation of progressive damage and permeability evolution of sandstone during direct-shearing. , 2024, 43(S1): 3161-3174.
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