Magneto-Gravity Simulation of Cone Penetration Test in Cohesionless Soil Under Small Gravity Fields
Lunar exploration projects have been re-launched recently by countries including America, Russia, Japan, and China, aiming to develop the resource exploration outside the Earth. The fundamental understanding of the mechanisms related to the small gravity fields and the specific space regolith is the key to further plans for outpost construction and resource utilization, as well as the site investigation. Cone penetration test is believed to serve as an effective in situ tool for site investigation in deep space exploration. The interpretation of CPT data under small gravity fields is investigated in this paper with the focus on the effect of gravity ranging from 1/6 to 4 g. Linear increase of cone tip resistance is observed for a shallow penetration, whereas the resistance increases with g-level under small gravity fields at a certain depth. The normalised penetration resistance is found to decrease exponentially with the g-level, and a relationship between the normalised penetration resistance and g-level is therefore proposed with comparisons of data from DEM simulation. Correlations between soil properties and CPT measurements are thus modified for the interpretation and application of in situ tests in the near-earth space exploration.
The author would like to acknowledge financial support from the National Natural Science Foundation of China (no. 51323004), 111 Project (B14021) and Natural Science Foundation of Jiangsu Province (no. BK20170279).
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