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| Generation and application of rockfill based on the Minkowski difference and the optimized advance front method#br# |
| LIU Xinrong1，2，DU Libing1，2，DENG Zhiyun1，2，GAO Guofu1，2 |
(1. School of Civil Engineering，Chongqing University，Chongqing 400045，China；2. National Joint Engineering Research Center for Prevention and Control of Environmental Geological Hazards in the TGR Area， Chongqing 400045，China) |
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Abstract A new conditional algorithm for generating granular packing is proposed，by which the granular has the same complex geometries with the realistic granular and follows the target particle size，orientation angle and aspect ratio distributions. Firstly，amounts of morphology information of realistic granular is obtained through original particle image and a database is established. Secondly，by using the Minkowski difference for collision detection，the particle overlap check and the new particle packing could be carried out efficiently. Finally，in combination with the optimized advance front method，a particle packing model is generated，particle-by-particle. Compared with the existing methods，the granular generated by the developed method has the same complex geometries as the realistic particles and can consider arbitrary particle size，orientation angle and aspect ratio distributions. In addition，the granular packing model generated has a higher packing rate and packing volume ratio，for instance，respectively more than 800/s and 75% for rectangle particles in the MATLAB environment. A generation of complex granular material demonstrates the particle packing generated by the method can represent the same geometries and microstructure of realistic granular. Three direct shear test simulations carried out by the discrete element software of UDEC reveal that the developed method can be widely used in the analysis of mechanical properties of granular materials.
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2020, Vol. 39 
