Icy lunar regolith(ILR) exists in lunar permanently shadowed regions. The preparation of ILR simulant is crucial for conducting ground-based tests for in-situ resource utilization(ISRU). To improve the fidelity of ILR, a novel method for ILR preparation was introduced, termed the water molecule deposition coating(WMDC) method, anchored in the natural formation mechanism of ILR. The cold regolith particles undergo complete tumbling, effectively trapping the water molecules. ILR samples were evaluated for uniformity in water content and micro-morphological characteristics to substantiate the effectiveness of this method. The discrete element method(DEM) was used to analyze the motion and mixing processes of lunar regolith particles within a baffled rotary drum and to determine the impact of various conditions on particle flow behaviors. The results revealed positive correlations between rotation speed, baffle number, and filling degree with central particle density (CPD), with optimal mixing index (MI) achieved at higher rotation speeds and lower filling degrees.

Vibratory compaction significantly affects the construction quality of the subgrade in the road construction. Establishing a numerical analysis model for the subgrade compaction process helps visualize the compaction process and enhances the quality of compaction for the subgrade. Nowadays, such nonlinear characteristics between the vibratory roller and subgrade could be captured by establishing numerical simulation methods via finite element analysis, which effectively reduces the difficulty of the solution. In these methods, however, the elastoplastic model for the subgrade material tends to ignore the plastic accumulation characteristics of the soil under cyclic loading. Aiming at this problem, a finite element simulation method is proposed for the compaction process of subgrade. In the method, a bounding surface model considering plastic accumulation effect under cyclic loading is used for modelling the compacted soil material. Consequently, a three-dimensional finite element simulation model of drum-soil was established by using UMAT in the secondary development of ABAQUS. Compared with experimental data and popular models like the modified Cambridge model, the DruckerPrager criterion and the Mohr-Coulomb model, the finite element simulation method in this study demonstrates higher accuracy in terms of soil stress, settlement and drum acceleration, confirming its effectiveness. Finally, the dynamic changes in stress and strain during the compaction and the effects of the excitation forces on compaction were analyzed by the finite element simulation method.