Feasibility Assessment
Performed feasibility assessment of retaining wall for roadway widening
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The Challenge
- Replacing a three-span to a two-span bridge
- Demolishing two bridge piers to build a center bridge pier
- Soil nail walls for support
The Connecticut Department of Transportation replaced a major bridge in Branford, CT that carries I-95 over US Route 1. The three-span bridge was replaced with a new, two-span bridge. The existing pile abutment foundations were re-used for support of the new bridge.
The project also involved the demolition of the two existing bridge piers and construction of a new center pier, widening and lowering the existing Route 1 roadway. Soil nail walls were used to support the existing abutments and provide space for roadway widening.
The Solution
Geocomp is the geotechnical engineer of record for the bridge replacement project. The roles performed by Geocomp on this project included geotechnical design recommendations of the new center piers, re-use of the abutment foundations, soil nail walls, and associated earthwork and dewatering.
The team of engineers provided the design, coordination, and supervision of an extensive subsurface investigation program, bearing capacity and settlement calculations for the new center pier foundations, in addition to abutment pile axial and lateral loading analyses. GeoTesting Express also partook in the project providing geotechnical laboratory testing of collected soil and bedrock samples.
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