史开文^a，左宇军^a，孙文吉斌^a，刘 镐^a，邬忠虎^b，林健云^a，李涛涛^a

（贵州大学 a. 矿业学院； b. 土木工程学院，贵州 贵阳 550025）

DOI:10.13732/j.issn.1008-5548.2021.06.006

收稿日期： 2021-04-12，修回日期：2021-07-06，在线出版时间：2021-10-18 16:30。

基金项目：国家自然科学基金项目，编号：51964007，51774101；贵州省高层次创新型人才培养项目，编号：黔科合人才[2016]4011号；贵州省矿山动力灾害预警与控制技术科技创新人才团队项目，编号：黔科合平台人才[2019]5619。

第一作者简介：史开文(1992—)，男，硕士研究生，研究方向为岩石破碎及破裂机理、模拟方法. E-mail：shikaiwen1123@163.com。

通信作者简介：左宇军，(1965—)，男，博士，教授，博士生导师，研究方向为岩石力学及采矿工程。E-mail：zuo_yujun@163.com。

摘要：采用数字图像技术及三维岩石破裂过程分析(RFPA3D)程序,建立基于真实细观结构的不规则砂岩单颗粒数值模型,模拟单轴压缩作用下不同形状砂岩颗粒的力学特性及变形破坏规律,研究不同形状及细观非均匀性对砂岩力学行为及破裂过程的影响。结果表明:不同形状砂岩颗粒在单轴压缩条件下存在脆性-延性转变过程;随着应力的增大,其内部拉伸破坏单元的积累导致试件中部形成宏观剪切破裂带;随着不同圆滑度系数k值的增加,不同形状砂岩试件峰值强度逐渐减小;此外,砂岩颗粒的断裂强度具有明显的形状效应,砂岩的细观非均质性决定其裂纹扩展路径。

关键词：数字图像；不规则颗粒；破裂过程；细观结构

Abstract：The irregular shape of the sample can significantly affect the compression process. This paper aimed to establish the three-dimensional numerical model based on real meso-structure using Rock Failure Process Analysis. We simulated the mechanical properties and deformation failure law of sandstone particles with different shapes under uniaxial compression. The effects of different shapes and heterogeneity on the mechanical behavior and fracture process of sandstone were studied. Our results show that the stress-strain curve of the specimens has brittleness-ductility under uniaxial compression. Meanwhile,as stress increases,tensile failure accumulates in rocks,resulting in the macroscopic shear crack zone. The peak strength of sandstone specimens with different shapes decreases by increasing the k value. Moreover,the specimen fracture showed an obvious shape effect,and the heterogeneity in the breaking process determines the crack propagation path. The current findings may play an important role in the crushing method and energy-saving of rock mining.

Keywords：digital image; irregular particle; failure process; meso-structure

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