颗粒离散元法工程应用的三大问题探讨

doi:10.13722/j.cnki.jrme.2019.0977

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摘要颗粒离散元法常用于岩土试样的宏微观特性研究。在模拟工程问题时，需要用较大的单元来代表岩土块体，并赋以相应的力学性质。颗粒离散元法的工程应用面临着三大问题：(1) 难以直接得到特定力学性质的堆积模型，其建模困难；(2) 计算量巨大，限制了大规模工程应用；(3) 多场和流固耦合理论以及软件还不完善。在分析这些问题本质和研究进展的基础上，提出宏微观转换公式和自动训练方法来快速建模；基于矩阵离散元计算法来实现高性能的数值计算；引入孔隙密度流法以实现快速的多场和流固耦合模拟。基于这些解决思路，从零开始研发了高性能离散元软件MatDEM，实现了综合大变形、多场和流固耦合数值模拟。最后，探讨了亟待解决的关键科学和技术问题。

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	刘春1
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	乐天呈1
	施斌1
	朱遥1

关键词 ：岩土工程, 离散元, 工程应用, MatDEM

Abstract：The particle discrete element method(DEM) is generally used in the macro-micro investigations of rock and soil samples. In order to simulate engineering problems，it is necessary to use larger elements to represent the rock and soil masses and to assign corresponding mechanical properties. However，there are three problems in the application of the DEM：(1) it is difficult to directly get the packing model with specific mechanical properties，i.e. the modeling is difficult，(2) large-scale engineering applications are limited by the huge computational cost and (3) the multi-field and fluid-solid coupling theory and software are not perfect. On the basis of analyzing the essence and research progress of these problems，macro-micro conversion formulas and an automatic training method are proposed for fast modeling. High performance numerical calculations can be completed based on the matrix discrete element method and the pore density flow method is introduced to realize fast multi-field and fluid-solid coupling simulations. Based on these solutions，a high-performance discrete element software MatDEM was developed from scratch，and large deformation，multi-field and fluid-solid coupling numerical simulations were realized. Finally，key science and technology problems in the future researches were discussed.

Key words： geotechnical engineering discrete element method engineering application MatDEM

引用本文:

刘春1，2，乐天呈1，施斌1，朱遥1. 颗粒离散元法工程应用的三大问题探讨[J]. 岩石力学与工程学报, 2020, 39(6): 1142-1152.
LIU Chun1，2，LE Tiancheng1，SHI Bin1，ZHU Yao1. Discussion on three major problems of engineering application of the particle discrete element method#br#. , 2020, 39(6): 1142-1152.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0977 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I6/1142

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