基于粒形特征影响的月壤静力学及流动特性离散元研究  

Distinct element method for static and flow mobility characteristics of lunar regolith based on particle shape characteristics

作　　者：石安宁 蒋明镜 王思远 林嘉禹 SHI Anning;JIANG Mingjing;WANG Siyuan;LIN Jiayu(Department of Civil Engineering,Tianjin University,Tianjin 300072,China;School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215009,China)

机构地区：[1]天津大学建筑工程学院土木工程系,天津300072 [2]苏州科技大学土木工程学院,江苏苏州215009

出　　处：《岩土工程学报》2025年第4期749-758,共10页Chinese Journal of Geotechnical Engineering

基　　金：海南省重点研发计划项目(ZDYF2021SHFZ264);国家重大自然灾害防控与公共安全重点专项(2022YFC3003400);国家自然科学基金创新研究群体项目(42221002)。

摘　　要：由于月壤独特的颗粒形态及物理力学特性,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重要指导意义。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3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,真实月壤表观黏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更大,而剖面剪切速率及配位数更小。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。Since it exhibits uniquely grain shape,physical and mechanical characteristics,the lunar regolith is extremely important for utilization of in-situ resources,selection of base station location and construction in lunar exploration.Based on the data of the shape characteristics of the lunar regolith,the distinct element method(DEM)is employed to study the static and flow mobility characteristics of the lunar regolith.Firstly,to reproduce the macroscopic static and flow behaviors of the lunar regolith sample,a complete three-dimensional contact model considering the grain shape characteristics of the Chang’E-5 mission is used,and then the corresponding shape parameters(coefficient of rolling resistanceβ)for different grain sizes are determined.Secondly,the triaxial tests under different confining pressures and the rotating drum tests under different rotating speeds are simulated using the DEM,and the samples include the lunar regolith,Toyoura sand,and glass beads.Finally,a contrastive analysis of the static and flow mobility characteristics of the three materials is conducted.The simulated results show that in the triaxial tests,compared with the other two materials,the lunar regolith has the largest apparent cohesion and internal friction angle,and it exhibits dilatancy in the shearing process.In the rotating drum tests,compared with the other two materials,the lunar regolith has the largest inclination angle and void ratio,and the smallest shearing rate and coordination number.Under a certain range of the inertia number,the lunar regolith has the largest effective friction coefficient compared with the other two materials,indicating that it has the smallest flow mobility.

关 键 词：嫦娥五号 月壤粒形特征 转筒 离散元 流动特性 有效摩擦系数 

分 类 号：TU432[建筑科学—岩土工程]