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Highway deep-patch geogrid applications

Deep-patch repairing is a cost-effective technique that addresses settlement and shallow landsliding of side-cast embankment fill slopes and natural slopes with weak soils overlaying stronger soils. Deep patches are commonly used in the Pacific Northwest on low-volume roads and can slow the development and propagation of roadway displacements over relatively fast-moving landslides. In this article, the authors examine the performance from three sites using deep-patch over landslides that were larger and faster moving than traditional deep-patch applications. The three project sites are: Going-to-the-Sun Road in Glacier National Park, Montana; Middle Fork Snoqualmie River Road in Mt. Baker-Snoqualmie National Forest, Washington; and Agnes Road MP 13 in Rogue-River National Forest, Oregon. In each case, deep patches with five to seven layers of geogrid are used, and the deep patches were all successful at slowing the development and propagation of roadway damage due to landslide.