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Geotechnical Engineering

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• Geotechnical Analysis
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Geotechnical Analysis

Centerstate Development, Columbia, MO

Allstate’s geotechnical staff performed preliminary geotechnical studies to guide mass grading; detailed design stage investigations as site development proceeded and construction materials testing and observation for the initial 90 acre Centerstate Development located on Columbia’s north side.  This unique commercial development on an attractive but geologically challenging tract of land included the Bass Pro anchor store; four stores comprising Furniture Row; a four story Hilton Garden Inn; the Lone Star and Ruby Tuesdays Restaurants; several commercial shops; a network of access drives and parking lots as well as a major US Highway 63 Overpass and Interchange and an extension of Vandiver Drive to provide access to the growing development. 

Challenging subsurface conditions varying from

• shallow expansive clays and claystones at the timber covered Furniture Row site on the south to 
• thick boulder and debris laden uncontrolled fills, a leaking pre-depression era earth dam and a Jurisdictional Stream at the Bass Pro site and
• an exposed deposit of water bearing glacio-fluvial sand with a high water table that extended across a 6 acre building and pavement area on the north were

Overcome by use of a phased and integrated approach to mass grading that accommodated the Jurisdictional Steam; protected the existing scenic lake while reconstructing the central core and downstream portion of its earth dam; and utilized available borrow materials including uncontrolled fill with boulders; expansive clays, claystones and shales; alluvial soils; and glacial clays and sands in areas where these materials were suitable for use and most complimented the overall development.

Uncontrolled fills encountered below the old dam and unsuitable native deposits encountered in proposed building areas were excavated and reused in non-critical fill areas; the tract’s hills were leveled; and the abundant and suitable glacial soils available in these upland borrow areas were selectively and economically utilized in moisture conditioned controlled compacted fills for buildings and access drives.  Post construction settlements of thicker earth fills were reduced to tolerable levels by use of controlled and monitored surcharging and the potentially damaging effects of expansive clays were mitigated by economical removal and replacement with moisture conditioned lean clay soils during extensive mass grading involving over 500,000 cubic yards of cut and fill.  A network of subsurface drains was installed in the water bearing sand deposits using an innovative Hollandrain vertical trenching system capable of installing interceptor drains in sands below the water table.  The phased, integrated and controlled mass grading plan allowed buildings to be supported on economical shallow foundations. 

Feature Projects

Geotechnical Analysis

Centerstate Development

Ashley Furniture Store

US Hwy 63 and Gans Rd. Overpass and Interchange