Project Description

Senior geotechnical consultant for the Four Bears Bridge over Lake Sakakawea under the direction of the North Dakota Department of Transportation. Provided geotechnical and structural foundation engineering services for the 914 mm diameter pipe piles and a drivability analysis using WEAP 2003. In addition, we provided value engineering services to determine if 2.75 m diameter drilled shafts could effectively replace the proposed 4 m diameter drilled shafts subjected to an axial service load of 41 MN and a lateral load due to ice forces of 3 MN in 20 m of water. The shafts were to be cased and penetrate soft surface soils and be socketed into hard clay/shale with a length of 50 m. Temporary construction engineering services were also provided.