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首页> 外文期刊>Engineering analysis with boundary elements >Micro-mechanism study on rock breaking behavior under water jet impact using coupled SPH-FEM/DEM method with Voronoi grains
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Micro-mechanism study on rock breaking behavior under water jet impact using coupled SPH-FEM/DEM method with Voronoi grains

机译：SPH-FEM / DEM与Voronoi颗粒耦合的水力作用下岩石破碎行为的微观机制研究

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摘要

In this study, a two-dimensional SPH-FEM/DEM coupled model is developed to investigate rock breaking behavior under water jet impact based on the LS-DYNA software, where the SPH method is adopted to model the water jet and the FEM/DEM method is adopted to simulate rock breaking response, respectively. To better approximate the micro-structure of rock, a Voronoi tessellation technique is adopted to generate the random polygonal grains. A zero-thickness cohesive element is inserted along the boundaries of the Voronoi grains to model the mechanical interaction between grains as well as the breaking process of rock. Numerical water jet impact tests on sandstone are firstly conducted to verify the proposed method as well as calibrate the corresponding micro-parameters. Then, using the verified method, the effects of micro-structure and micro-mechanical properties on the rock breaking performance under water jet impact are systematically investigated. The numerical results show that the rock breaking performance is greatly affected by grain size and irregularity, ductility, microscopic strength and the heterogeneity of micro-parameters, whereas the contact stiffness ratio has little effect on the rock breaking performance under water jet impact.
机译：在这项研究中，基于LS-DYNA软件，开发了二维SPH-FEM / DEM耦合模型来研究水射流冲击下的岩石破碎行为，其中采用SPH方法对水射流和FEM / DEM进行建模方法分别模拟了岩石破碎响应。为了更好地近似岩石的微观结构，采用了Voronoi镶嵌技术来生成随机的多边形晶粒。沿着Voronoi晶粒的边界插入零厚度的粘结元素，以模拟晶粒之间的机械相互作用以及岩石的破裂过程。首先对砂岩进行了水射流冲击试验，以验证所提出的方法并校准相应的微参数。然后，利用验证的方法，系统地研究了微结构和微机械性能对水射流冲击下岩石破碎性能的影响。数值结果表明，岩石的破碎性能受晶粒尺寸，不规则度，延展性，微观强度和微观参数的不均匀性影响很大，而接触刚度比对水射流冲击下的岩石破碎性能影响很小。

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