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Columbia Parkway Landslide Stabilization

Seasonal hillside instability has been a recurring problem along Columbia Parkway for decades in the form of abrupt landslides and gradual downslope movement of colluvium (soil creep). Following a series of significant landslides in multiple locations along the uphill side of the parkway, the City of Cincinnati in 2019 sought a long-term stabilization plan for 9 areas along Columbia Parkway.

Geotechnology, a UES Company, completed explorations involving borings and/or test pits on the steep terrain for evaluating the subsurface conditions for the slope stabilization designs. After evaluating the geologic conditions of the areas, Geotechnology recommended two types of stabilization mechanisms for the project: soldier pile and lagging (SPL) walls, and soil nails with steel mesh. The selection of the stabilization mechanism was based on the geometry of the ground surface and the subsurface conditions.

  • The SPL walls were used along approximately 1,500 feet of hillside parallel to Columbia Parkway near the toe of the slope.
  • The soil nail stabilization mechanism was applied to approximately 4,000 feet of slope paralleling the highway and generally extended 50 feet upslope of the lower row of soil nails.

Geotechnology prepared design plans for both the SPL walls and soil nail stabilization mechanisms. Catchments areas were included in the designs to allow material that overtops the SPL walls or soil nail stabilization areas to accumulate in the catchment areas, allowing the City to remove the materials at more opportune times when traffic demands on the parkway are less.

Geotechnology’s services included: drilling services, geotechnical laboratory testing services, and engineering design services for slope stabilization measures (soldier pile and lagging walls and soil nail stabilizations).

CLIENT

Beaver Excavating Company

LOCATION

Cincinnati, Ohio

SERVICES PROVIDED

Geotechnical Engineering