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  • 1
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    Soil mechanics (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Preliminary results are presented of an investigation of the physical and mechanical properties of lunar soil on the Descartes slopes, and the Cayley Plains in the vicinity of the LM for Apollo 16. The soil mechanics data were derived form (1) crew commentary and debriefings, (2) television, (3) lunar surface photography, (4) performance data and observations of interactions between soil and lunar roving vehicle, (5) drive-tube and deep drill samples, (6) sample characteristics, and (7) measurements using the SRP. The general characteristics, stratigraphy and variability are described along with the core samples, penetrometer test results, density, porosity and strength.
    Keywords: SPACE SCIENCES
    Type: Apollo 16 Prelim. Sci. Rept.; 29 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Soil mechanics (1973)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The soil mechanics experiment on the Apollo 17 mission to the Taurus-Littrow area of the moon is discussed. The objectives of the experiment were to determine the physical characteristics and mechanical properties of the lunar soil at the surface and subsurface in lateral directions. Data obtained on the lunar surface in conjunction with observations of returned samples of lunar soil are used to determine in-place density and porosity profiles and to determine strength characteristics on local and regional scales.
    Keywords: SPACE SCIENCES
    Type: NASA. Johnson Space Center Apollo 17 Prelim. Sci. Rept.; 22 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A borehole jack for deformability, strength, and stress measurements in a 2-inch borehole (1971)
    In:  CASI
    Details
    Publication Date: 2006-05-25
    Description: A borehole jack devised for lunar exploration is described and results of its use in simulated lunar solids are presented. A hydraulic cylinder mounted between two stiff plates acts to spread the plates apart against the borehole walls when pressured. The spreading is measured by a displacement transducer and the load is measured hydraulically. The main improvement over previous instruments is the increased stroke, which allows large deformations of the borehole. Twenty-eight pistons are used to obtain a high hydraulic efficiency, and three return pistons are also provided. Pressure-deformation curves were obtained for each test on Lunar Soil Simulant No. 2, a light gray silty basalt powder.
    Keywords: GEOPHYSICS
    Type: Lunar Surface Eng. Properties Expt. Definition, Vol. 3; 28 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Boulder tracks and nature of lunar soil. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Boulder tracks from 19 different locations on the Moon, observable in Lunar Orbiter photographs, have been examined. Measurements of the track width indicate that some of the boulders sank considerably deeper than others. It is suggested that lunar surface materials vary from place to place; the state of compaction (density of lunar soil) is probably one of the significant variables. Using bearing capacity theory, modified to be applicable to the rolling boulder problem by theoretical studies and extensive testing, the friction angle of the lunar soil was estimated. Most of the results were between 24 and 47 degrees with an arithmetic average of 37 degrees.
    Keywords: SPACE SCIENCES
    Type: The Moon; 6; Jan
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Lunar soil properties and soil mechanics (1972)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The study to identify and define recognizable fabrics in lunar soil in order to determine the history of the lunar regolith in different locations is reported. The fabric of simulated lunar soil, and lunar soil samples are discussed along with the behavior of simulated lunar soil under dynamic and static loading. The planned research is also included.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-127637 , SSL-SER-13-ISSUE-60
    Format: application/pdf
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  • 6
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    Lunar surface engineering properties experiment definition (1971)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Research on the mechanics of lunar soils and on developing probes to determine the properties of lunar surface materials is summarized. The areas of investigation include the following: soil simulation, soil property determination using an impact penetrometer, soil stabilization using urethane foam or phenolic resin, effects of rolling boulders down lunar slopes, design of borehole jack and its use in determining failure mechanisms and properties of rocks, and development of a permeability probe for measuring fluid flow through porous lunar surface materials.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-121043 , SSL-SER-11-ISSUE-52
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  • 7
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    Lunar surface engineering properties experiment definition. Volume 3: Borehole probes (1971)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Borehole jacks for studying lunar soils and rocks
    Keywords: SPACE SCIENCES
    Type: NASA-CR-121046 , SSL-SER-11-ISSUE-50
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Lunar surface engineering properties experiment definition. Volume 2: Mechanics of rolling sphere-soil slope interaction (1971)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The soil deformation mode under the action of a rolling sphere (boulder) was determined, and a theory based on actual soil failure mechanism was developed which provides a remote reconnaissance technique for study of soil conditions using boulder track observations. The failure mechanism was investigated by using models and by testing an instrumented spherical wheel. The wheel was specifically designed to measure contact pressure, but it also provided information on the failure mechanism. Further tests included rolling some 200 spheres down sand slopes. Films were taken of the rolling spheres, and the tracks were measured. Implications of the results and reevaluation of the lunar boulder tracks are discussed.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-121045 , SSL-SER-11-ISSUE-49
    Format: application/pdf
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