直剪过程中砂岩渐进损伤及渗透演化的离散元模拟

doi:10.13722/j.cnki.jrme.2023.0122

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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 words： rock 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.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0122 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/IS1/3161

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