SHI Kaiwen^a，ZUO Yujun^a，SUN Wenjibin^a，LIU Hao^a，WU Zhonghu^b，LIN Jianyun^a，LI Taotao^a

(a. Mining College; b. College of Civil Engineering, Guizhou University, Guiyang 550025, China)

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

中图分类号： TU451

文献标志码：A

文章编号：1008-5548(2021)06-0050-10

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。