Abstract
The mechanical behaviors of Martian regolith-structure interfaces are of great significance for the design of rover, development of excavation tools, and construction of infrastructure in Mars exploration. This paper presents an experimental investigation on the properties of a Martian regolith simulant (JEZ-1) through one-dimensional oedometer test, direct shear test, and interface direct shear tests between JEZ-1 and steel plates with different roughness. Oedometer result reveals that the compression and swelling indexes of the JEZ-1 are quite low, thus it is a less compressible and lower swelling soil. The cohesion and adhesion of JEZ-1 are lower than 5 kPa. The values of the internal friction angle range from 39.7° to 40.6°, and the interface friction angles are 16.7° to 36.2° for the smooth and rough interface. Furthermore, the direct shear and interface direct shear results indicate that the interface friction angles are lower than the internal friction angles of JEZ-1 and increase close to the internal friction angles with increasing interface roughness.
Highlights
The National Aeronautics and Space Administration (NASA) launched the Mars 2020Perseverance Rover mission on 30 July 2020, the Perseverance Rover landed on Jezero Crater, Mars on 18th February 2021
Like other Martian soil simulants [4], the JEZ-1 represents an unconsolidated material as wFieglul,rheo2w
A one-dimensional oedometer test was performed on a dry JEZ-1 simulant, aiming to provide a first insight into its properties of compressibility
Summary
Perseverance Rover mission on 30 July 2020, the Perseverance Rover landed on Jezero Crater, Mars on 18th February 2021. This research mainly investigated the interface direct shear responses of a Martian simulant named JEZ-1, to provide the first insight into understanding the geotechnical characteristics of the Martian soil It is a Jezero Crater simulant developed by the CLASS Exolith Lab at the University of Central Florida, in preparation for the Mars 2020 Perseverance Rover mission. Clays only form in the presence of water, it is the reason why Jezero Crater Delta can provide a great place for the scientific goal of the Mars 2020 mission It aims at seeking a potentially habitable environment that may possess preserved signs of ancient microbial life. MGGrrgaaOiinn ssiizzee ddiissttrriibbuuttiioonn ccuu2rrvv5ee.9ss ooff JJEEZZ--11,, JJSSCC MMaarrss--11CaaannOdd MMMMSS--11
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