GeoStabilization International® collaborated with USFS Geotechnical Engineers on a plan to stabilize an infinite slope failure that regularly deposited rockfall debris on Hyalite Canyon Road at the base of a 300-foot, 1H:1V slope. Catastrophic failure of the upper mantle of colluvium could conceivable deposit thousands of cubic yards of material into Hyalite Creek which provides 40% of the drinking water for the city of Bozeman.
The plan was twofold; a soil nail buttress was constructed at the top of the scarp to arrest further movement of the colluvium overburden, and a GCS® rock catchment wall was constructed at the bottom to collect loose debris. Project totals included (303) 40-foot soil nails, (75) micropiles, 3,000 SF of shotcrete, and 3,840 SF of GCS® wall. GSI® crews successfully completed this challenging project during several inclement weather events typical for the climate of Montana.
In the 1970s, a massive rockslide buried Interstate 81 in Montgomery County, VA while it was being constructed. The mountain of debris took months to clear. More recently, VDOT engineers and geologists noticed active movement near the historic slide, and proactively began an emergency rock slope mitigation effort.