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Effectiveness of Stone Columns on Slope Deformations beneath Wharves
This paper the use of a multi-tiered approach for analyzing the effectiveness of stone column ground improvement to limit deformations of slopes containing liquefiable soil layers. The application addressed in the paper relates to ground improvement below a new pile-supported wharf at the Port of Tacoma. The purpose of stone columns is to reduce slope movements in the slope caused by liquefaction and lateral spreading such that the wharf and its supporting piles are not damaged during a design level earthquake. The authors performed numerous stability and deformation analyses at the wharf slope, with and without ground improvement. In order of complexity and cost, the analyses included slope stability (Slope/W), simple slope movement (Newmark), more advanced slope deformation but with a simplified soil model (PLAXIS) and more advanced slope deformation but with an effective stress soil model that includes pore pressure considerations (FLAC). The results indicate that while the simpler analyses provide a reasonable estimate of slope movement and the impact on the wharf piles, they tend to be somewhat conservative. The most advanced analyses (FLAC) that include pore pressure impacts and a better method to model pile-soil interaction provide the least conservative results. Thus, FLAC was used in the final analyses to verify that 5 rows of stone columns is adequate to reduce slope movements and piles deformations to an acceptable level.
Effectiveness of Stone Columns on Slope Deformations beneath Wharves
This paper the use of a multi-tiered approach for analyzing the effectiveness of stone column ground improvement to limit deformations of slopes containing liquefiable soil layers. The application addressed in the paper relates to ground improvement below a new pile-supported wharf at the Port of Tacoma. The purpose of stone columns is to reduce slope movements in the slope caused by liquefaction and lateral spreading such that the wharf and its supporting piles are not damaged during a design level earthquake. The authors performed numerous stability and deformation analyses at the wharf slope, with and without ground improvement. In order of complexity and cost, the analyses included slope stability (Slope/W), simple slope movement (Newmark), more advanced slope deformation but with a simplified soil model (PLAXIS) and more advanced slope deformation but with an effective stress soil model that includes pore pressure considerations (FLAC). The results indicate that while the simpler analyses provide a reasonable estimate of slope movement and the impact on the wharf piles, they tend to be somewhat conservative. The most advanced analyses (FLAC) that include pore pressure impacts and a better method to model pile-soil interaction provide the least conservative results. Thus, FLAC was used in the final analyses to verify that 5 rows of stone columns is adequate to reduce slope movements and piles deformations to an acceptable level.
Effectiveness of Stone Columns on Slope Deformations beneath Wharves
Mageau, Daniel (author) / Chin, King (author)
Technical Council on Lifeline Earthquake Engineering Conference (TCLEE) 2009 ; 2009 ; Oakland, California, United States
TCLEE 2009 ; 1-12
2009-06-24
Conference paper
Electronic Resource
English
Effectiveness of Stone Columns on Slope Deformations beneath Wharves
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