Location: Hamilton Township, Mercer County, New Jersey
Client/Owner: NJDOT Division of Project Management
Phase: Concept Development and Final Design
Status: Final Design Completed
The Interstate 295 North Exit Ramp to Interstate 195 East is owned and maintained by the New Jersey Dept. of Transportation. KMA was commissioned by the NJDOT to provide Concept Development and Final Design phase services to address the slope failure that was occurring along the southern embankment of the ramp.
Project tasks included the evaluation of current conditions and deficiencies, development of typical cross sections, geotechnical analysis, utility coordination, drainage design, crash analysis, lighting analysis, municipality coordination, public involvement, right-of-way evaluation, and approximate construction cost development. Additionally, KMA carried out environmental work, including an environmental screening and assessment of permit requirements.
The preferred alternative selected was the king pile cutoff wall to stabilize the lateral translation with drilled displacement piles to arrest the settlement of the subbase soils. A seepage and slope stability analysis was conducted to determine the required sheeting depth to achieve stabilization. This design accounts for any anticipated movement at the toe of slope in order to ensure the ramp movement is minimal to none, and was constructed to provide a 100-year service life with a signifcant reduction in maintenance costs throughout its lifespan.