Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (7): 2015-2025.doi: 10.13229/j.cnki.jdxbgxb.20221128

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Experiment on compressive strength of simulated lunar soil based on grey correlation analysis

En-liang WANG1,2(),Zhi-feng REN1,2,Chu WANG3,Jun-wei LIU2,4,Xing-chao LIU1,2,Ye TIAN2,5,Meng ZOU6,Zi-xiao LU7,Wei-wei ZHANG4,Sheng-yuan JIANG4()   

  1. 1.School of Water Conservancy and Civil Engineering，Northeast Agricultural University，Harbin 150030，China
    2.HIT-NEAU Joint Laboratory of Planetary Icy Regolith Analysis and Measurement，Harbin 150030，China
    3.Beijing Space Vehicle General Design Department，China Institute of Space Technology，Beijing 100094，China
    4.Aerospace Mechanism and Control Research Center，Harbin Institute of Technology，Harbin 150001，China
    5.Light Industry College，Harbin University of Commerce，Harbin 150028，China
    6.Key Laboratory of Bionic Engineering，Ministry of Education，Jilin University，Changchun 130022，China
    7.National Center for Nanoscience and Technology，Beijing 100190，China
  • Received:2022-08-31 Online:2024-07-01 Published:2024-08-05
  • Contact: Sheng-yuan JIANG E-mail:hljwel@126.com;jiangshy@hit.edu.cn

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Abstract:

The primary objective of the Chang'e-7 mission is to detect water ice in the permanently shadowed regions of the Moon's south pole. This study involves conducting simulation research within an Earth-based environment， preparing test samples of polar hydrous simulated lunar soil， and assessing the mechanical properties of these simulants under ultra-low temperatures. Additionally， it analyzes how various factors—including moisture content， compactness， temperature， loading rate， substrate composition， and compressive strength—interact. The results indicate that the compressive strength of the frozen lunar soil simulants increases with higher moisture content， greater compactness， and lower temperatures， while it is less influenced by variations in loading rate. The compressive strength is affected by substrate composition in the following order：100% plagioclase <90% plagioclase +10% basaltic <70% plagioclase +30% basaltic <100% basaltic lunar soil simulant. Furthermore， this study employs grey correlation analysis to explore the relationships among fundamental physical property indices such as moisture content， compactness， temperature， loading rate， substrate ratio， and compressive strength. The analysis reveals the following order of correlation strength： moisture content>compactness>temperature>substrate ratio>loading rate. This paper not only examines the preparation and mechanical properties of aqueous lunar soil but also proposes a more systematic and standardized implementation scheme. This serves as a foundational basis for understanding the characteristics of polar aqueous lunar soil， providing valuable theoretical insights and references for subsequent lunar soil simulation research..

Key words: terramechanics, hydrous lunar soil simulant, compressive strength, grey correlation theory, correlation degree

CLC Number: 

  • TU441

Table 1

Composition and particle size index of basaltic simulated lunar soil"

物质组成形态比重压缩指数颗粒级配/%
中值粒径/μmCuCc
斜长石，其他镁铁矿物棱角状2.940.3741.910.95

Table 2

Composition and particle size index of plagioclase simulated lunar soil"

物质组成形态比重颗粒级配/%
中值粒径/μmCuCc
玄武质火山渣，钛铁矿和橄榄石矿等棱角次棱角状2.7388.3310.810.92

Fig.1

Drying diagram of lunar soil simulant"

Fig.2

Schematic diagram of mixing of lunar soil simulant"

Fig.3

Standing diagram of lunar soil simulant"

Fig.4

Schematic diagram of compaction of lunar soil simulant"

Fig.5

Schematic diagram of freezing of lunar soil simulant"

Fig.6

Ultralow-temperature moon soil mechanical properties test system"

Fig.7

Compressive strength of lunar soil simulant with different moisture content"

Fig.8

Compressive strength of lunar soil simulant with different compactness"

Fig.9

Compressive strength of lunar soil simulant at different temperatures"

Fig.10

Compressive strength of lunar soil simulant at different loading rates"

Fig.11

Compressive strength of lunar soil simulant with different base material ratio"

Table 3

Grey system sequence"

编号斜长岩占比/%含水率/%温度/℃相对密实度/%加载速率/（mm·min-1）强度/MPa
11005-190991017.74
210010-190991027.41
310015.50-190991053.16
410010-1099105.76
510010-30991013.65
610010-50991016.62
710010-70991019.28
810010-230991028.84
910010-190701015.32
1010010-190861024.45
1110010-190993027.19
1210010-190992531.91
1310010-190992028.08
1410010-190991533.89
1510010-19099531.66
1610010-19099122.68
179015.50-190991053.57
187015.50-190991060.44
19015.50-190991067.34

Table 4

Association coefficients table"

项斜长岩占比含水率温度相对密实度加载速率
第1项0.6880.9010.6440.7130.808
第2项0.8570.9810.7900.8970.952
第3项0.6260.7770.6670.6060.551
第4项0.5530.6010.8960.5690.628
第5项0.6350.7000.8060.6560.736
第6项0.6720.7460.8210.6970.787
第7项0.7100.7930.8420.7370.840
第8项0.9450.9180.7440.9940.863
第9项0.6550.7250.6160.8320.764
第10项0.7970.9030.7390.9250.964
第11项0.8520.9740.7860.8910.403
第12项0.9680.8980.8840.9820.510
第13项0.8721.0000.8030.9130.590
第14项0.9750.8530.9320.9280.878
第15项0.9610.9040.8780.9890.642
第16项0.7650.8620.7110.7960.626
第17项0.5850.7700.6620.6020.547
第18项0.4740.6660.5830.5360.492
第19项0.3330.5860.5210.4830.447

Table 5

Association ranking results"

评价项关联度排名
斜长岩占比/%0.7334
含水率/%0.8191
温度/℃0.7543
相对密实度/%0.7762
加载速率/（mm·min-1）0.6865

Fig.12

Rank of each evaluation item"

Table 6

Basic physical parameters of lunar soil in the Antarctic permanent shaded area［25-29］"

序号参数基本物理参数
1密实度平均密度为1.4~1.8 g/cm3，相对密度为2.76~2.86 g/cm3
2温度月球极区夏季最高温度可达308 K，冬季最低温度约为10 K，夏季平均温度为201 K，冬季平均温度为42 K
3含水率月球永久阴影区月壤水冰富集深度大于1.8 m，根据M3、LCROSS等探测任务发现，其含水率在1%以上，最高超过5.6%
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