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石安宁, 蒋明镜, 王思远, 林嘉禹. 基于月壤粒形特征的月壤静力学及流动特性离散元研究[J]. 岩土工程学报. DOI: 10.11779/CJGE20230997
引用本文: 石安宁, 蒋明镜, 王思远, 林嘉禹. 基于月壤粒形特征的月壤静力学及流动特性离散元研究[J]. 岩土工程学报. DOI: 10.11779/CJGE20230997
Distinct element method study of the static and flow mobility characteristics of lunar regolith based on the particle shape characteristic[J]. Chinese Journal of Geotechnical Engineering. DOI: 10.11779/CJGE20230997
Citation: Distinct element method study of the static and flow mobility characteristics of lunar regolith based on the particle shape characteristic[J]. Chinese Journal of Geotechnical Engineering. DOI: 10.11779/CJGE20230997

基于月壤粒形特征的月壤静力学及流动特性离散元研究

Distinct element method study of the static and flow mobility characteristics of lunar regolith based on the particle shape characteristic

  • 摘要: 由于月壤独特的物理力学特性,研究其与不同材料间静力学及流动特性差异对于月球原位资源利用、基地选址及建造具有至关重要的指导意义。本文基于真实月壤粒形特征数据,采用离散单元法对月壤静力学及流动特性进行了研究。首先基于嫦娥五号携带返回月壤样品粒形特征,使用三维完整接触模型,确定不同粒径月壤形状参数(抗转动系数β),以期反映真实月壤样品宏观静力学及流动性响应;随后对月壤、丰浦砂及玻璃珠等材料进行不同围压下三轴试验和不同转速下转筒试验离散元模拟;最后对三种材料的静力学及流动特性进行了对比分析。离散元模拟结果表明:在三轴试验模拟中,相较于其他材料,真实月壤粘聚力及内摩擦角明显偏大,且在剪切过程中表现出一定剪胀特性。在转筒试验模拟中,相较于其他材料,真实月壤工况稳态倾角和剖面孔隙比较大,而剖面剪切速率及配位数较小。在一定惯性数范围内,真实月壤有效摩擦系数最大,使其表现出较低的流动性。

     

    Abstract: Due to the uniquely physical and mechanical characteristics of lunar regolith, studying the differences in static and flow mobility properties between lunar and other materials, is extremely important for In Situ Resource Utilization, base station location selection, and construction in lunar exploration. Based on the data of lunar regolith of shape characteristics, this article employed the distinct element method (DEM) to study the static and flow mobility characteristics of lunar regolith. Firstly, to reproduce the macroscopical static and flow behaviors on the sample of lunar regolith, a complete three-dimensional contact model which considered the grain shape characteristics of Chang’E-5 mission is used, then the corresponding shape parameters (coefficient of rolling resistance β) with different grain sizes are determined. Secondly, the triaxial test under different confining pressure and the rotating drum test under different rotating speeds are simulated using DEM, which samples include the lunar regolith, toyoura sand, and glass bead. Finally, a contrastive analysis of static and flow mobility characteristics of the three materials is performed. The simulation results show that, in the triaxial tests, compared with the other two materials, the lunar regolith has the largest cohesion and internal friction angle, and it has the dilatancy in the shearing process. In the rotating drum tests, compared with the other two materials, lunar regolith has the largest inclination angle and void ratio, and the smallest shearing rate and coordination number. Under a certain range of inertia number, the lunar regolith has the largest effective friction coefficient compared with the other two materials, which correspond it has the smallest flow mobility.

     

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