| Deformation mechanisms in granular media | |
| Of interest are mechanisms of deformation localization along deformation bands and joints in sand and sandstone. Deformation bands are planar or curviplanar zones of finite width, usually a few grain diameter in thickness, of deformation. Based on the dominant mode of deformation, we distinguish shear, compaction, and dilation bands. Recently, we have focused on compaction bands. | |
 |
|
| Pure (PCB) and shear-enhanced (SCB) compaction bands in Aztec Sandstone at Valley of Fire. Pure compaction bands are typically wavy whereas shear-enhanced compaction bands are planar. Zig-zaggin bands are composed of alternating right- and left-lateral shear-enhanced compaction bands. Pure compaction bands are oriented perpendicular to the maximum principal shortening direction. From Eichhubl et al., 2010. | |
 |
Three modes of deformation localization in granular media (from Du Bernard et al., 2002). |
 |
Shear band (inclined) and dilation bands (sub-horizontal, red arrows) originating at the tips of shear band segments (from Du Bernard et al., 2002). Pen rests on ledge formed by the shear band which is more resistant to weathering compared to the undeformed sand. |
Publications
|
|