颗粒流数值模拟在月壤岩土问题研究中的应用概况

Application of particle flow code numerical simulation in research of geotechnical behavior of lunar soil

总结颗粒流数值模拟在月壤岩土问题研究中的应用,取得的主要成果:考虑粒间作用力及低重力的影响对月壤颗粒接触力学模型进行修正;确定模型的细观参数及其对宏观力学性质的影响;利用"Clump"命令生成颗粒簇对月壤/模拟月壤的颗粒形状进行模拟;进行月壤基本力学性质的模拟研究及其与地面土壤的对比研究;分析月面低重力场对月壤-车轮相互作用机理及牵引性能的影响;进行月壤基本岩土工程问题的模拟仿真及数值耦合分析.随着计算机技术的发展,选择合适的颗粒接触模型,考虑月壤颗粒的实际形状和低重力场等的影响,耦合其他数值模拟方法实现多尺度模拟分析是今后对月壤岩土问题进行颗粒流数值模拟研究的主要方向,也是技术难点所在.

Aiming at the application of particle flow code（PFC）numerical simulation in the research of geotechnical behavior of lunar soil,main research achievements were briefly introduced.The particle contact model was modified by considering the particle interaction and the effect of low gravity.The micro-parameters of particle contact model was determination,as well as the effect on macroscopic mechanical properties of lunar soil.Make cluster of particles to simulate the particle shape of lunar soil/lunar soil simulant by using the command＂Clump＂.Take simulation study of the macroscopic mechanical properties of lunar soil and take comparative study of the differences with soil on the earth.The effect of low gravity on the interaction mechanism between lunar soil and wheel was analyzed,as well as the tractive efficiency.Numerical simulation and coupling analysis of the basic geotechnical engineering problem of lunar soil was taken.Along with the development of computer technology,the application of PFC numerical simulation in the research of geotechnical behavior of lunar soil should take the following factors into account for multi-scale analysis：an appropriate particle contact model,the effect of particle shape of the real lunar soil and the particular environment like the low gravity,and the coupling other numerical simulation methods.