Jet grouting for a groundwater cutoff wall in difficult glacial soil deposits

Conference · Wed Dec 31 04:00:00 EST 1997

OSTI ID:576591

Flanagan, R F; Pepe, F Jr ^[1]

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1. Parsons Brinckerhoff Quade & Douglas, New York, NY (United States)

Jet grouting is being used as part of a groundwater cutoff wall system in a major New York City subway construction project to limit drawdowns in an adjacent PCB contamination plume. A circular test shaft of jet grout columns was conducted during the design phase to obtain wall installation parameters. The test program also included shaft wall mapping, and measurements of; inflows, piezometric levels, ground heave and temperature, and jet grout hydraulic conductivity. An axisymmetric finite element method groundwater model was established to back calculate the in-situ hydraulic conductivities of both the surrounding glacial soils and the jet grout walls by matching observed inflows and piezometric levels. The model also verified the use of packer permeability test as a tool in the field to evaluate the hydraulic conductivities of jet grout columns. Both the test program and analytic studies indicated that adjustments to the construction procedures would be required to obtain lower hydraulic conductivities of the jet grout walls for construction. A comparison is made with the conductivities estimated from the test program/analytic studies with those from the present construction.

• Research Organization: USDOE, Washington, DC (United States)
• OSTI ID: 576591
• Report Number(s): CONF-970208--Proc.; ON: DE98001967
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
CONTAINMENT SYSTEMS
FINITE ELEMENT METHOD
GROUND WATER
GROUTING
HYDRAULIC CONDUCTIVITY
INSTALLATION
JETS
PERMEABILITY
POLLUTION CONTROL
SOILS