Redevelopment of Brownfield sites using Controlled Modulus Columns as an alternate to Deep Foundations

Frederic Masse, Chris Parinella, Robert Wyman

Dans les comptes rendus d’articles de la conférence: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Ground Improvement/Remediation

ABSTRACT: Controlled Modulus Columns (CMC) is a ground improvement technology that allows shallow foundations on sites that traditionally require deep foundations. The CMC installation is attractive from an environmental perspective because it utilizes displacement augers, thereby avoiding the spoil and disposal required with traditional augers. The reverse flight auger displaces the soil laterally densifying the soil around it. In addition the hole is backfilled with cement grout under moderate pressure that also densifies the surrounding soils. The system is capped by a granular well-compacted platform which serves as a load transfer layer to transmit the load from the structure to the semi-rigid CMCs. The load is then transmitted to a stronger bearing stratum below, or shed into surrounding soils at greater depth. Our paper will focus on the use of CMC to mitigate long term settlements and improve bearing capacity at two brownfield sites, one in Pennsylvania for the construction of a large produce warehouse and one in New Jersey for the construction of a Retail development. We will develop the sustainability / green construction aspects of CMC design and installation, using these particular cases.

RÉSUMÉ: supercompacte qui sert de couche de repartition transmettant les efforts et charges de la superstructure aux CMCs semi-rigides. La charge est ensuite transmise en pointe de CMCs aux couches profondes plus denses ou distribuee par frottement aux couches sous-jacentes. CMCs pour réduire les tassements a long terme et améliorer la capacité portante de sols sur deux sites contamines, un en Pennsylvanie pour la construct et nouveau centre commercial. développement durable / environnement du design des CMCs ainsi que de leur installation en utilisant ces projets comme exemples.

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