徐永福, 奚悦, 冯兴波, 朱洪高, 褚飞飞. 2015: 岩石单颗粒压缩破碎的数值模拟分析. 工程地质学报, 23(4): 589-596. DOI: 10.13544/j.cnki.jeg.2015.04.001
    引用本文: 徐永福, 奚悦, 冯兴波, 朱洪高, 褚飞飞. 2015: 岩石单颗粒压缩破碎的数值模拟分析. 工程地质学报, 23(4): 589-596. DOI: 10.13544/j.cnki.jeg.2015.04.001
    XU Yongfu, XI Yue, FENG Xingbo, ZHU Honggao, CHU Feifei. 2015: SIMULATION OF ROCK GRAIN BREAKAGE USING PFC2D. JOURNAL OF ENGINEERING GEOLOGY, 23(4): 589-596. DOI: 10.13544/j.cnki.jeg.2015.04.001
    Citation: XU Yongfu, XI Yue, FENG Xingbo, ZHU Honggao, CHU Feifei. 2015: SIMULATION OF ROCK GRAIN BREAKAGE USING PFC2D. JOURNAL OF ENGINEERING GEOLOGY, 23(4): 589-596. DOI: 10.13544/j.cnki.jeg.2015.04.001

    岩石单颗粒压缩破碎的数值模拟分析

    SIMULATION OF ROCK GRAIN BREAKAGE USING PFC2D

    • 摘要: 岩石颗粒破碎是影响粒状材料剪切强度和变形的最主要因素, 岩石颗粒破碎并不是想象的那么难, 像花岗岩颗粒有时在很小的压应力作用下就可以破碎。岩石单颗粒破碎的物理试验结果常常很离散, 完成大量单颗粒破碎的物理试验费时费力不现实, 采用离散单元法(Discrete element method, DEM)PFC软件模拟单颗粒压缩破碎试验, 既能克服单颗粒破碎物理试验的缺陷, 又能解决单颗粒破碎物理试验工作量大的难题, 是研究单颗粒破碎的理想选择。基于DEM的软件PFC2D, 将粒径为0.075~0.1245mm的基本粒子捆绑成不同粒径的单颗粒, 模拟岩石单颗粒压缩破碎试验, 观察颗粒破碎演化过程, 统计单颗粒破碎强度。计算单颗粒压缩破碎后颗粒分布的分维, 验证单颗粒破碎强度的分形模型和单颗粒破碎强度的尺寸效应。文中引用玄武岩单颗粒破碎试验结果, 与单颗粒破碎的离散单元模拟结果进行比较, 验证单颗粒破碎强度的尺寸效应和修正的Weibull理论的离散单元模拟结果。

       

      Abstract: The most important engineering properties of coarse granular materials such as stress-strain and strength behavior, volume change and shear strength depend on the amount of grain breakages that occur when the stresses imposed on soil particles exceed their strength. Grain breakages(such as granite grains may occur even at relatively low compressive stresses) depend on the character of the individual rock grains. Experiments of grain breakages usually lead scatter data, and are time consuming to perform. A good method based on discrete element method(DEM)gives a potentially useful tool to study single grain breakage. A number of basical particles with diameters of 0.075~0.1245mm are bundled up a grain aggregate using PFC2D.Grain aggregates are used to simulate rock grain. Fractal model and size effect of breakage strength are analysed using grain aggregate based on PFC2D.Experimental data of basalt grain crushing are cited to verify the DEM simulation of the size effect of crushing strength and the modified Weibull modle.

       

    /

    返回文章
    返回