Bearing strength of lunar soil |
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Authors: | L D Jaffe |
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Institution: | (1) Jet Propulsion Laboratory, California Institute of Technology, Pasadena, Calif., USA |
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Abstract: | Bearing load vs penetration curves have been measured on a 1.3 g sample of lunar soil from the scoop of the Surveyor 3 soil mechanics surface sampler, using a circular indentor 2 mm in diameter. Measurements were made in an Earth laboratory, in air. This sample provided a unique opportunity to evaluate earlier, remotely controlled, in-situ measurements of lunar surface bearing properties. Bearing capacity, measured at a penetration equal to the indentor diameter, varied from 0.02–0.04 N cm–2 at bulk densities of 1.15 g cm–3 to 30-100 N cm–2 at 1.9 g cm–3. Deformation was by compression directly below the indentor at bulk densities below 1.61 g cm–3, by outward displacement at bulk densities over 1.62 g cm–3. Preliminary comparison of in-situ remote measurements with those on returned material indicates good agreement if the lunar regolith at Surveyor 3 has a bulk density of 1.6 g cm–3 at 2.5 cm. depth; definitive comparison awaits both better data on bulk density of the undisturbed lunar soil and additional mechanical-property measurements on returned material. |
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