The slopes along Oklahoma's Ouachita Mountains (US-270) fail because geology, hydrology, and gravity intersect in unfavorable combinations. Weak soil layers trap water. Weathered rock loses cohesion. Steep cuts exceed the natural angle of repose. The result is slope movement that ranges from slow creep—cracking pavements and tilting retaining walls over months—to sudden catastrophic failures that close corridors and endanger lives.
Every unrepaired slope failure enlarges with each subsequent rain event. The headscarp retreats upslope. The toe pushes further onto the roadway. What starts as a manageable repair becomes a major reconstruction project when left to cycle through multiple wet seasons without permanent stabilization.
Soil nailing reinforces failed slopes from within—driving steel reinforcement through the slide mass into stable material below the failure surface. The nailed zone resists the driving forces causing movement. GSI installs soil nails using both conventional drilling and the patented Soil Nail Launcher™, which fires SuperNails™ into saturated, actively moving ground without excavation.
Where Oklahoma's slopes fail along shallow surfaces, driven steel pins provide rapid, cost-effective reinforcement without full soil nail wall construction. Combined with surface drainage improvements, slope pins arrest shallow translational failures common in weathered residual soils.
Water is the trigger for virtually every landslide in Oklahoma. GSI designs horizontal drainage systems—that reduce pore water pressure within the slope mass. Combined with reinforcement, drainage provides the layered defense that prevents future reactivation.
Soil Nail Launcher™ for difficult soils. When saturated ground collapses conventional boreholes, our Launcher installs reinforcement on the first attempt—no failed drilling, no wasted mobilization.
Deep failure plane targeting. We engineer repairs that reach the actual failure surface, not surface patches that reactivate next season.
Integrated drainage design. Every slope repair includes drainage because water is the trigger for virtually every Oklahoma landslide.
ODOT-ready documentation. Engineering designs, construction records, and as-built drawings meeting state specifications.
DOT and infrastructure owners describe the landslide repair solutions GSI delivers across the state.
GSI’s geotechnical experts deliver proven landslide repair solutions across Oklahoma. Schedule a site-specific assessment to stabilize your slope and protect your infrastructure.
