Interstate-15 CORE Reconstruction

Principals of Gerhart Cole Inc. (CGI) provided both project management and geotechnical design services for six of the 24 miles of this fast-track, design-build project through Utah County, Utah. Our work included four new bridges, three temporary bridges, several major culvert crossings, and appurtenant features such as MSE walls.

Project challenges included soft soil conditions (leading to large, slow settlements that were mitigated using surcharge), liquefaction prone soils, and artesian groundwater conditions. Pile design for the bridges was critical, providing adequate lateral capacity for seismic loads and also minimizing the effects of downdrag while accommodating approach embankment settlement.