Physics – Geophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pggp.rept..497p&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986 p 497-498 (SEE N87-23341 16-91)
Physics
Geophysics
Deposition, Fracture Mechanics, Mars Surface, Tensile Stress, Thickness, Clays, Deformation, Domes (Geology), Sands, Soil Mechanics, Wetting
Scientific paper
Four experiments demonstrate that tension-fracture patterns above an uplifting dome depend on the thickness of the overburden layer being deformed. Four layers of increasing thicknesses (4.92 cm, 6.92 cm, 9.05 cm, and 11.12 cm) of a very fine sand (85%) and silt-clay (15%) mixture were updomed by slowly inflating a 1.22 m-diameter circular rubber pillow. The upper 2 cm of each layer was wetted and air dried to make it brittle and susceptible to fracture. The fractures that formed during these experiments exhibited a continuum of patterns from dominantly arcuate to dominantly radial as the overburden thickness increased. However, fracture density remained constant in each case for a given amount of surface deformation.
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