A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Monitoring a Drilled Shaft Retaining Wall in Expansive Clay: Long-Term Performance in Response to Moisture Fluctuations
A full-scale drilled shaft retaining wall was constructed in Manor, Texas on a site underlain by approximately 15 m of the highly overconsolidated, expansive Taylor clay. This wall was instrumented with inclinometers and fiber optic strain gauges. During a four-year monitoring period, performance data were recorded during construction, excavation, seasonal moisture fluctuations, and controlled inundation testing which provided the retained soil with access to water at the ground surface. This paper discusses performance of the test wall over a range of soil moisture conditions, including an extremely dry state caused by the most extreme drought on record in this area and the wettest possible state when wall deflections ultimately reached equilibrium after eight months of controlled inundation. The wettest possible state corresponded to the development of drained conditions in both the retained soil and the foundation soil. The maximum earth pressures applied by the retained soil were comparable to active conditions mobilizing the drained, fully-softened shear strength; there was no evidence of greater pressures being applied as the soil swelled to its ultimate equilibrium condition. The measured p–y curves for the foundation soil were consistent with passive conditions mobilizing a drained shear strength between the peak and fully-softened strengths.
Monitoring a Drilled Shaft Retaining Wall in Expansive Clay: Long-Term Performance in Response to Moisture Fluctuations
A full-scale drilled shaft retaining wall was constructed in Manor, Texas on a site underlain by approximately 15 m of the highly overconsolidated, expansive Taylor clay. This wall was instrumented with inclinometers and fiber optic strain gauges. During a four-year monitoring period, performance data were recorded during construction, excavation, seasonal moisture fluctuations, and controlled inundation testing which provided the retained soil with access to water at the ground surface. This paper discusses performance of the test wall over a range of soil moisture conditions, including an extremely dry state caused by the most extreme drought on record in this area and the wettest possible state when wall deflections ultimately reached equilibrium after eight months of controlled inundation. The wettest possible state corresponded to the development of drained conditions in both the retained soil and the foundation soil. The maximum earth pressures applied by the retained soil were comparable to active conditions mobilizing the drained, fully-softened shear strength; there was no evidence of greater pressures being applied as the soil swelled to its ultimate equilibrium condition. The measured p–y curves for the foundation soil were consistent with passive conditions mobilizing a drained shear strength between the peak and fully-softened strengths.
Monitoring a Drilled Shaft Retaining Wall in Expansive Clay: Long-Term Performance in Response to Moisture Fluctuations
Brown, Andrew C. (author) / Dellinger, Gregory (author) / Helwa, Ali (author) / El-Mohtar, Chadi (author) / Zornberg, Jorge (author) / Gilbert, Robert B. (author)
IFCEE 2015 ; 2015 ; San Antonio, Texas
IFCEE 2015 ; 1348-1357
2015-03-17
Conference paper
Electronic Resource
English
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