江汇, 周元德, 池昌江, 张宇. 2015: 颗粒料层侧限受压破碎模式的试验和数值模拟研究. 工程地质学报, 23(s1): 70-76. DOI: 10.13544/j.cnki.jeg.2015.s1.011
    引用本文: 江汇, 周元德, 池昌江, 张宇. 2015: 颗粒料层侧限受压破碎模式的试验和数值模拟研究. 工程地质学报, 23(s1): 70-76. DOI: 10.13544/j.cnki.jeg.2015.s1.011
    JIANG Hui, ZHOU Yuande, CHI Changjiang, ZHANG Yu. 2015: ON THE BREAKAGE PATTERN OF PARTICLE BEDS UNDER CONFINED COMPRESSION:TEST AND NUMERICAL STUDY. JOURNAL OF ENGINEERING GEOLOGY, 23(s1): 70-76. DOI: 10.13544/j.cnki.jeg.2015.s1.011
    Citation: JIANG Hui, ZHOU Yuande, CHI Changjiang, ZHANG Yu. 2015: ON THE BREAKAGE PATTERN OF PARTICLE BEDS UNDER CONFINED COMPRESSION:TEST AND NUMERICAL STUDY. JOURNAL OF ENGINEERING GEOLOGY, 23(s1): 70-76. DOI: 10.13544/j.cnki.jeg.2015.s1.011

    颗粒料层侧限受压破碎模式的试验和数值模拟研究

    ON THE BREAKAGE PATTERN OF PARTICLE BEDS UNDER CONFINED COMPRESSION:TEST AND NUMERICAL STUDY

    • 摘要: 高速碎屑流滑坡运动过程复杂, 其中快速滑体的剧烈内部变形及其与周围山体的快速碰撞都可能导致滑体的进一步解体以及内部碎屑岩块的渐进损伤破碎。研究碎屑岩块的渐进破碎机理及其对滑体宏观变形力学行为的影响有着重要的意义。本文以松散颗粒堆积体的渐进破碎模式为研究对象, 选取典型球状陶泥颗粒, 基于室内侧限压缩试验开展了系列准静态压碎试验研究, 分析和讨论了变化粒径组合工况下颗粒破碎模式和机制。并建立了考虑球状颗粒随机堆放的三维数值模型, 考虑颗粒之间法向和切向接触行为, 基于连续介质损伤模型开展了颗粒破碎模拟研究。结果表明, 在侧限压载作用下球状颗粒堆积料层的张拉破碎模式占优, 改变初始颗粒粒径分布将触发不同的颗粒破碎模式, 基于建立的数值模型分析得颗粒破碎模式和试验结果符合较好, 可拓展应用于分析不规则松散岩块堆积体的渐进损伤破碎行为。

       

      Abstract: Rock avalanche is characterized by complex kinematic process where drastic deformation and frequent collision with surrounding mountains of high-speed sliding rock mass may contribute to further dynamic fragmentation and progressive breakage of internal clastic rock fragments. It is of great significance to investigate the underlying mechanism of progressive breakage of rock fragments and its effects on macro deformation and mechanical behavior of sliding rock mass. This paper aims at the study of the progressive breakage failure of particle beds. Firstly, a series of confined compression tests were conducted on a type of spherical ceramic particle chosen to simulate quasi-brittle rock materials, and the comminution patterns and the mechanism behind were analyzed. Secondly, a three-dimensional numerical model was established which is capable of incorporating random deposition of spherical particles of prescribed size distribution and the frictional contact interaction between adjacent particles. The potential damage and fracture within a particle was simulated by a continuum damage material model. The test results demonstrate that tension splitting fracture dominates the size reduction performance of spherical particles under confined compression, and the variation of size distribution of the feed can mobilize different comminution patterns. The numerical results of particle breakage pattern compare favorably with the test results, and the numerical model can be extended for future applications in the progressive damage and disintegration behavior of particle assemblies made up of irregular rock fragments.

       

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