Dilation bands: A new form of localized failure in granular media

Details Dilation bands: A new form of localized failure in granular media Dilation bands: A new form of localized failure in granular media

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29x..29d&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 24, pp. 29-1, CiteID 2176, DOI 10.1029/2002GL015966

Physics

14

Physical Properties Of Rocks: Fracture And Flow, Physical Properties Of Rocks: Microstructure, Physical Properties Of Rocks: Permeability And Porosity, Structural Geology: Mechanics, Structural Geology: Microstructures

Scientific paper

We report a structure that is characterized by a localized increase in porosity or dilation within a tabular band of on average 1-2 mm thickness in porous, poorly consolidated sand. These dilation bands formed in predominantly opening-mode and provide a sharp contrast to planar opening-mode fractures or joints with two discrete surfaces in consolidated, low porosity brittle rock. Our observation of dilation bands, together with previously recognized shear and compaction bands, complete the spectrum of localized deformation modes along tabular bands in poorly consolidated sand and sandstone consistent with recent theoretical predictions of deformation localization in granular media.

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