During the construction of New State Route 48 near Lawrenceburg, Indiana, the Indiana Department of Transportation encountered a zone of very weak ice-age lacustrine clay deposits. Excavations at the toe of these unstable slopes caused a series of shallow slides that rippled up to the crest of the hill, encroaching on INDOT’s right of way and causing safety concerns. GeoStabilization engineers designed a mechanical buttress at the toe of the slope that, in conjunction with minor filling behind the buttress, prevented further regression of these “infinite slope” failures. We kept total repair costs to a minimum by aggressively stabilizing the toe of the slide rather than attempting to treat the entire area. After many years of service, the buttress has prevented any further failures of the slope.
A variation of karst sinkhole grouting is the grouting of mined coal seams and workings located below existing infrastructure that exhibit the potential to propagate to the surface and cause sinkholes and/or subsidence.