Tag Archives: Shallow Foundation

DBA Project Highlight: MoDOT I-44 Project Bridge Rebuild

I-44 Construction Aerial View; video courtesy of Emery Sapp & Sons

DBA has partnered with bridge designer Parsons and prime contractor Emery Sapp & Sons on a design/build project in Southwest Missouri being administered by MoDOT.  Design is complete and the project is in construction phase.  The project involves replacing 13 bridges and rehabilitating another six bridges along a 30-mile stretch of I-44 between Sarcoxie and Halltown.  The $36 million project is progressing nicely with construction beginning in 2019 and on schedule to be completed by December 15, 2021. To get a birds-eye view of some of the work, check out the video at the top of the post (from Emery Sapp & Sons)

Although smaller bridges than DBA typically works on, challenging subsurface conditions and unique structure types have made things interesting with respect to foundation design and construction.  Foundation types for various structures include driven H-piles installed with high-strain dynamic testing, drilled shafts with rock sockets in various rock formations, and spread footings bearing on near surface bedrock where applicable.  Pinnacle bedrock surface and karstic foundation conditions are prevalent in the area and this project is no exception.  Foundation design had to anticipate the complex subsurface conditions and consider constructability throughout the entire design process.

More information on the project can be found at MoDOT’s project page:  https://www.modot.org/i-44-project-bridge-rebuild .  Below are some photos taken by DBA staff while on site.

Photo Credit: DBA


Simplified Settlement Model–DFI Journal Technical Note by Tim Siegel

DFIJv5No1Tim has authored a Technical Note in the most recent issue (June 2011) of the DFI Journal.  The note is entitled “Simplified Settlement Model for a Shallow Foundation on Composite Ground with Rigid Piles”.  From the Abstract:

A piled raft refers to a shallow foundation that is structurally connected to the piles, while composite ground refers to a soil-pile matrix where the piles are not structurally connected. The design objectives for both a piled raft and composite ground are (excluding special considerations such as expansive soil): (1) to provide a sufficient ultimate resistance and (2) to distribute the load into the soil-pile matrix so that the settlement experienced by the shallow foundation is within tolerable limits. A simplified model is proposed for a shallow foundation on composite ground where the foundation settlement is estimated as the sum of the downward movement of the piles plus the downward movement of the shallow foundation relative to the pile head. The proposed simplified
model is applied using conventional geotechnical analyses for two hypothetical examples of shallow foundations undergoing compression settlement.

This paper was originally published in DFI’s bi-annual journal, Volume 5, No. 1 in June 2011.  DFI is an international technical association of firms and individuals involved in the deep foundations and related industry. The DFI Journal is a member publication. To join DFI and receive the journal, go to www.dfi.org for further information. ”

You can also subscribe to the DFI Journal here.