Abstract
Penetration resistance, in terms of the slope G of the stress penetration curve, has been correlated with density for a basaltic lunar soil simulant. The values were measured with the standard WES 30° cone penetrometer. This lunar soil simulant has been found to possess the same penetration resistance characteristics as the Apollo lunar soil. Bearing capacity equations have been used to determine G-values for the lunar soil simulant and the predicted values were found to agree very well with measured G-values. Using the same bearing capacity equations the computations were repeated for the lunar gravity field by reducing the material unit weight by a factor of six. These G-values represent a predicted correlation between G and density for lunar soil. This correlation has been entered with density estimates obtained from Apolli core tube studies as well as independent density estimates obtained from astronaut foot-print depth analysis. The probable range in G-values obtained for lunar surface material is expected to be useful in the evaluation of the performance of lunar roving vehicles.
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