Caltrans Glossary
"Progressive, discontinuity controlled failure of small rock blocks within the general rock mass at or near the excavation surface. Raveling is manifested as successive fallout of small rock blocks, and can ultimately result in a significant void beyond the tunnel perimeter."

Definition from the "Caldecott Improvement Project: Geotechnical Baseline Report," prepared by Jacobs Associates, June 2009. 100 pp.

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