Work began Thursday to repair a major landslip at the northern end of Bellevue Street on Harmar Hill, and crews expect the stabilization effort to be completed today.
“We started drilling around noon and should be done with the entire project Friday,” said Jesus Herrera, project superintendent for GeoStabilization International (GSI).
The landslip is located at the top of a steep hillside in the 100 block of Bellevue Street. It has been closed to traffic at the intersection with Lancaster Street since 2012 due to concerns the Bellevue roadway at the top of the hill could eventually collapse onto Lancaster Street.
Marietta City Council approved the emergency stabilization work for the Bellevue landslip on June 19 at a cost of $54,300. The GSI crew began work a week later.
Herrera said the company works on landslips throughout the country, and the Bellevue slip is a small job compared to others GSI has done.
He said the stabilization process begins with rows of 20-foot-long hollow steel “soil nails” drilled into the bedrock near the top of the slip area.
“We then fill the nails with grout and then insert an epoxy-coated rebar into the center of each nail,” Herrera explained.
A steel mesh will be welded onto the ends of the soil nails, forming a connecting grid, then the entire grid will be covered with a concrete substance that will form a wall-like structure at the top of the slip area.
Herrera said the repair would make the roadway stable enough to hold traffic again.
“One of the best parts of this project is that GSI provides a five-year warranty for their work, which is almost unheard of for such a high-risk project,” said Eric Lambert, project manager for the city engineering department.
He said once the project is completed the city will be able to repair the Bellevue roadway, some of which had fallen away due to the slip, then reinstall guardrail so that the street can be reopened to traffic.
The engineer’s office and city streets department are expected to meet today to discuss the scope of work that will have to be done in order to reopen the street.
Another chronic landslip, on a hillside near the southern end of Bellevue Street, has forced the city to also close a section of Maple Street between Fort Harmar Drive and Bellevue. According to the city engineer’s office, repair of that slip could be much more costly than the stabilization project completed near the Bellevue and Lancaster streets intersection this week.