Location

Chicago, Illinois

Session Start Date

4-29-2013

Session End Date

5-4-2013

Abstract

Landslide activity along U.S. 50 in Cincinnati, Ohio has caused roadway damage for decades. After a necessary closure of 3 lanes due to slope movements, emergency stabilization measures were undertaken to protect the roadway by providing a “pseudo” short-term solution (target 3 to 5 years) necessitated by ODOT budget constraints. The landslide shear plane was near the top of a sloping bedrock surface as much as 50 feet below grade. “Stub Piers” were installed 40 feet downslope of the roadway shoulder. The shafts were heavily reinforced across the deep shear plane but steel reinforcing did not extend the full length of the shafts and was stopped well short of the ground surface. The goal was to provide shear resistance across the failure plane, forcing the theoretical failure surface higher into the overburden soil profile, resulting in a comparatively higher safety factor against slope failure. These “Stub Piers” were installed and found to meet all of the project goals. The stub piers and surrounding ground were instrumented and analyses of collected data to date showed earth pressures and horizontal deflections were over-predicted in the original design. Instrumentation by means of inclinometers, vibrating wire earth pressure cells, and strain gages has been monitored over a period of several years since construction of the Stub Piers and results indicate this option offers an attractive alternative to conventional drilled piers or tiedback drilled pier solutions.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Seventh Conference

Publisher

Missouri University of Science and Technology

Publication Date

4-29-2013

Document Version

Final Version

Rights

© 2013 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 29th, 12:00 AM May 4th, 12:00 AM

Landslide Stabilization Along The Ohio River Using Cantilevered Stub Piers

Chicago, Illinois

Landslide activity along U.S. 50 in Cincinnati, Ohio has caused roadway damage for decades. After a necessary closure of 3 lanes due to slope movements, emergency stabilization measures were undertaken to protect the roadway by providing a “pseudo” short-term solution (target 3 to 5 years) necessitated by ODOT budget constraints. The landslide shear plane was near the top of a sloping bedrock surface as much as 50 feet below grade. “Stub Piers” were installed 40 feet downslope of the roadway shoulder. The shafts were heavily reinforced across the deep shear plane but steel reinforcing did not extend the full length of the shafts and was stopped well short of the ground surface. The goal was to provide shear resistance across the failure plane, forcing the theoretical failure surface higher into the overburden soil profile, resulting in a comparatively higher safety factor against slope failure. These “Stub Piers” were installed and found to meet all of the project goals. The stub piers and surrounding ground were instrumented and analyses of collected data to date showed earth pressures and horizontal deflections were over-predicted in the original design. Instrumentation by means of inclinometers, vibrating wire earth pressure cells, and strain gages has been monitored over a period of several years since construction of the Stub Piers and results indicate this option offers an attractive alternative to conventional drilled piers or tiedback drilled pier solutions.