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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Load Tests Help Optimize Design of Deep Foundations
Augercast piles and drilled shafts are being used to support environmental control structures and equipment at a Southeast electric generating plant. The plant is located within the Piedmont physiographic province, and is underlain by a typical subsurface profile consisting of upper silty and clayey sands, silts and clays, underlain by a partially weathered rock stratum of varying thickness grading to relatively unweathered rock. Structures with moderate loading were designed to be supported by augercast piles bearing in the partially weathered rock and designed for both side friction and end bearing. Drilled shafts bearing in rock, also designed for both side friction and end bearing, were used to support the more heavily loaded structures. The initially installed augercast piles were subjected to static load tests for compressive, uplift and lateral capacity, indicating higher compressive capacities were available and subsequent phases of the project utilized capacities as much as 50 percent higher than those used originally. Similarly, Osterberg® cell load tests (O-cell) were performed on two drilled shafts at the site, one installed using wet construction methods and the other with dry construction methods (with dewatering and downhole cleaning/inspection.) The load tests evaluated end bearing as well as side friction in the rock, the partially weathered rock and the overburden soils. The results of the drilled shaft load tests allowed for optimization of foundation design with end bearing and rock socket side shear values higher than originally predicted. Furthermore, the O-cell tests revealed similarity between capacities generated from both dry and wet methods of construction. Thus, the decision was made to issue a foundation contract using wet construction methods. Both load test findings resulted in direct cost savings of several million dollars, along with indirect savings due to reductions in the length of the construction schedule.
Load Tests Help Optimize Design of Deep Foundations
Augercast piles and drilled shafts are being used to support environmental control structures and equipment at a Southeast electric generating plant. The plant is located within the Piedmont physiographic province, and is underlain by a typical subsurface profile consisting of upper silty and clayey sands, silts and clays, underlain by a partially weathered rock stratum of varying thickness grading to relatively unweathered rock. Structures with moderate loading were designed to be supported by augercast piles bearing in the partially weathered rock and designed for both side friction and end bearing. Drilled shafts bearing in rock, also designed for both side friction and end bearing, were used to support the more heavily loaded structures. The initially installed augercast piles were subjected to static load tests for compressive, uplift and lateral capacity, indicating higher compressive capacities were available and subsequent phases of the project utilized capacities as much as 50 percent higher than those used originally. Similarly, Osterberg® cell load tests (O-cell) were performed on two drilled shafts at the site, one installed using wet construction methods and the other with dry construction methods (with dewatering and downhole cleaning/inspection.) The load tests evaluated end bearing as well as side friction in the rock, the partially weathered rock and the overburden soils. The results of the drilled shaft load tests allowed for optimization of foundation design with end bearing and rock socket side shear values higher than originally predicted. Furthermore, the O-cell tests revealed similarity between capacities generated from both dry and wet methods of construction. Thus, the decision was made to issue a foundation contract using wet construction methods. Both load test findings resulted in direct cost savings of several million dollars, along with indirect savings due to reductions in the length of the construction schedule.
Load Tests Help Optimize Design of Deep Foundations
Pegues, James C. (Autor:in) / Anundson, Wade (Autor:in) / Adeyefa, Ayoade (Autor:in)
International Foundation Congress and Equipment Expo 2009 ; 2009 ; Orlando, Florida, United States
Contemporary Topics in Deep Foundations ; 111-118
10.03.2009
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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