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<p>With the rapid development of lunar exploration projects, the utilization of in-situ lunar resources and the establishment of lunar bases have garnered significant global attention. However, the exploitation and utilization of lunar resources will encounter various engineering and geological challenges. Therefore, it is urgent and essential to develop a constitutive model for lunar soil that can accurately predict the mechanical behavior of lunar regolith. Addressing the scarcity of lunar soil and the difficulty of replicating the lunar environment, this study employs a three-dimensional Discrete Element Method (DEM) model, incorporating realistic particle geometries from the Chang’E-5 (CE-5) mission, to investigate the mechanical properties of lunar regolith. Subsequently, triaxial compression tests were simulated with DEM to explore the mechanical properties of lunar regolith with varying porosity under both lunar and terrestrial conditions. A new shape phase parameter was proposed to quantify the influence of particle morphology. The hypoplastic constitutive framework was conceptually extended by introducing apparent cohesion through a stress tensor transformation. Based on this extension, a novel constitutive model was developed. Comparisons between model predictions and simulation results demonstrate that the proposed model accurately captures the mechanical behavior of numerical lunar soil samples.</p>

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A hypoplastic model for lunar regolith based on Chang’E-5 lunar sample

  • 期刊论文

  • 发表日期：

    2026年3月14日

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  • Siyuan Wang,
  • Mingjing Jiang,
  • Jun Liu

摘要

With the rapid development of lunar exploration projects, the utilization of in-situ lunar resources and the establishment of lunar bases have garnered significant global attention. However, the exploitation and utilization of lunar resources will encounter various engineering and geological challenges. Therefore, it is urgent and essential to develop a constitutive model for lunar soil that can accurately predict the mechanical behavior of lunar regolith. Addressing the scarcity of lunar soil and the difficulty of replicating the lunar environment, this study employs a three-dimensional Discrete Element Method (DEM) model, incorporating realistic particle geometries from the Chang’E-5 (CE-5) mission, to investigate the mechanical properties of lunar regolith. Subsequently, triaxial compression tests were simulated with DEM to explore the mechanical properties of lunar regolith with varying porosity under both lunar and terrestrial conditions. A new shape phase parameter was proposed to quantify the influence of particle morphology. The hypoplastic constitutive framework was conceptually extended by introducing apparent cohesion through a stress tensor transformation. Based on this extension, a novel constitutive model was developed. Comparisons between model predictions and simulation results demonstrate that the proposed model accurately captures the mechanical behavior of numerical lunar soil samples.