Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Performance Evaluation of Instrumented LNG Retention Dikes on Louisiana Soft Clays
As a part of a new Liquefied Natural Gas (LNG) import terminal located at coastal Louisiana, about 12,500 linear ft of retention dikes are being constructed around multiple LNG tanks. The 18 to 23 ft high dikes are constructed over 80 ft deep soft clay overlying a dense sand layer. The upper few feet of soft clays were stabilized in-place. The dikes are instrumented with settlement plates, inclinometers and piezometers, and monitored from the start of fill placement. To expedite consolidation of soft clays, prefabricated vertical drains (PVDs) were installed into the deep sand layer beneath the dikes extending laterally 50 ft from the dike toes. To optimize the PVD spacing, slope design and rate of fill placement, a test dike section was constructed with PVDs spaced at 2 ft and 4 ft centers. The selected settlement plates, inclinometers and piezometers data from the start of dike construction in May 2005 to February 2007 are presented. The data analyses and results of the dike performance and design optimization studies are also presented. It appears that rate of consolidation is similar for PVDs at 2 ft and 4 ft spacing as a result of significant soil disturbance effect at closer spacing causing reduced permeability in the smeared zone. Observations made at settlement plates and inclinometers were useful in evaluating in-situ Ch and stability during construction.
Performance Evaluation of Instrumented LNG Retention Dikes on Louisiana Soft Clays
As a part of a new Liquefied Natural Gas (LNG) import terminal located at coastal Louisiana, about 12,500 linear ft of retention dikes are being constructed around multiple LNG tanks. The 18 to 23 ft high dikes are constructed over 80 ft deep soft clay overlying a dense sand layer. The upper few feet of soft clays were stabilized in-place. The dikes are instrumented with settlement plates, inclinometers and piezometers, and monitored from the start of fill placement. To expedite consolidation of soft clays, prefabricated vertical drains (PVDs) were installed into the deep sand layer beneath the dikes extending laterally 50 ft from the dike toes. To optimize the PVD spacing, slope design and rate of fill placement, a test dike section was constructed with PVDs spaced at 2 ft and 4 ft centers. The selected settlement plates, inclinometers and piezometers data from the start of dike construction in May 2005 to February 2007 are presented. The data analyses and results of the dike performance and design optimization studies are also presented. It appears that rate of consolidation is similar for PVDs at 2 ft and 4 ft spacing as a result of significant soil disturbance effect at closer spacing causing reduced permeability in the smeared zone. Observations made at settlement plates and inclinometers were useful in evaluating in-situ Ch and stability during construction.
Performance Evaluation of Instrumented LNG Retention Dikes on Louisiana Soft Clays
Suroor, A. Hadi (Autor:in)
Seventh International Symposium on Field Measurements in Geomechanics ; 2007 ; Boston, Massachusetts, United States
FMGM 2007 ; 1-12
21.09.2007
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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