Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Distress of a Large Diameter Underground Reinforced Concrete Shaft
A large diameter reinforced concrete underground shaft suffered from significant cracking during construction. The plans called for the shaft to be partially constructed using sinking caisson technique. The sinking would occur in a uniform silty clay in the upper 45-ft, then it would sink in a “mixed face” condition of silty clay and silt/sand with 75-ft artesian head in the granular layers. Once the caisson reached the mixed face sinking rate slowed down, ground losses evolved, and structural cracks were observed. The most probable causes of failure were identified as unbalanced loads from either different ko in the mixed face zone or due to ground losses leading to partial loss of confinement. Both probable causes were evaluated against construction chronology from field observations, and results from simplified elastic solutions. The results indicate that the lost confinement had a more adverse effect on the stability of the shaft wall.
Distress of a Large Diameter Underground Reinforced Concrete Shaft
A large diameter reinforced concrete underground shaft suffered from significant cracking during construction. The plans called for the shaft to be partially constructed using sinking caisson technique. The sinking would occur in a uniform silty clay in the upper 45-ft, then it would sink in a “mixed face” condition of silty clay and silt/sand with 75-ft artesian head in the granular layers. Once the caisson reached the mixed face sinking rate slowed down, ground losses evolved, and structural cracks were observed. The most probable causes of failure were identified as unbalanced loads from either different ko in the mixed face zone or due to ground losses leading to partial loss of confinement. Both probable causes were evaluated against construction chronology from field observations, and results from simplified elastic solutions. The results indicate that the lost confinement had a more adverse effect on the stability of the shaft wall.
Distress of a Large Diameter Underground Reinforced Concrete Shaft
Khasawneh, Yazen A. (Autor:in) / Al-Omari, Aslam A. (Autor:in) / Sharo, Abdulla A. (Autor:in)
First Congress on Technical Advancement ; 2017 ; Duluth, Minnesota
Congress on Technical Advancement 2017 ; 184-196
07.09.2017
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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