L14 Flats – Omaha, Nebraska


 

Completed StructureProject Description:

This is a four-story residential building in downtown Omaha.  It has maximum column loads of 265 kips and wall loads of 11.5 kips per lineal foot.

Subsurface Conditions:

The site had up to 20 feet of existing urban fill.  The design team had three choices to deal wiht the poor soils: deep over-excavation, pile foundations, or Geopier ground improvement.  They selected the Geopier approach due to low cost, speed, space constraints and also to allow for conventional footings.

Solution:

Deanna Baker, P.E, with Ground Improvement Engineering (GIE) designed the Geopier GP3TM system to improve the fill and support normal spread footings.  The licensed installer for Nebraska, Peterson Contractors, Inc. installed 140 GP3 elements in a week.

GIE also designed a soldier pile and wood lagging retention system to protect an existing subgrade brick wall and an adjacent street.  Peterson installed steel H-piles, and helical anchors as tiebacks.

Project Team

Geopier Designer: Ground Improvement Engineering, Omaha, NE
Structural Engineer: Nielsen-Baumert Engineering – Omaha, NE  
Geotechnical Engineer: Terracon, Inc. – Omaha, Nebraska 
General Contractor: Dicon Construction – Omaha, NE 
Geopier Installer: Peterson Contractors, Inc.