徐永福. 2018: 基于颗粒破碎的粗粒土剪切强度的模拟分析. 工程地质学报, 26(6): 1409-1414. DOI: 10.13544/j.cnki.jeg.2017-432
    引用本文: 徐永福. 2018: 基于颗粒破碎的粗粒土剪切强度的模拟分析. 工程地质学报, 26(6): 1409-1414. DOI: 10.13544/j.cnki.jeg.2017-432
    XU Yongfu. 2018: PFC2D SIMULATION OF ROCKFILL SHEAR STRENGTH BASED ON PARTICLE FRAGMENTATION. JOURNAL OF ENGINEERING GEOLOGY, 26(6): 1409-1414. DOI: 10.13544/j.cnki.jeg.2017-432
    Citation: XU Yongfu. 2018: PFC2D SIMULATION OF ROCKFILL SHEAR STRENGTH BASED ON PARTICLE FRAGMENTATION. JOURNAL OF ENGINEERING GEOLOGY, 26(6): 1409-1414. DOI: 10.13544/j.cnki.jeg.2017-432

    基于颗粒破碎的粗粒土剪切强度的模拟分析

    PFC2D SIMULATION OF ROCKFILL SHEAR STRENGTH BASED ON PARTICLE FRAGMENTATION

    • 摘要: 颗粒破碎在岩土工程领域是很常见的现象,土工试验中无法显示颗粒破碎过程及其影响,本文采用离散单元软件PFC2D模拟了考虑颗粒破碎影响的粗粒土的直剪试验,给出了考虑颗粒破碎的粗粒土直剪试验的模拟方法,分析粗粒土的剪应力-剪切位移关系、剪胀和剪切强度等宏观力学行为,探讨基本颗粒间黏聚力、单颗粒孔隙率和粗粒土试样的孔隙率对剪切强度的影响。结果表明:颗粒破碎对剪切强度的破碎准则有影响,颗粒不破碎试样的剪切强度符合Mohr-Coulomb准则;颗粒破碎试样的强度包络线是幂函数关系。

       

      Abstract: PFC2D code is used to simulate the direct shear tests of rockfills, taking into consideration of the particle crushing. The methods to establish the model of the rockfill sample and conduct the tests are given. The results obtained from the numerical simulation are analyzed from several aspects, such as the characteristics of stress-strain relationship, volume strain and shear strength. The effect of the contact-bond strength between basic particles, the porosity of the single rock particle and the porosity of the rockfill material on the shear strength of the rockfills are also discussed.

       

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