Location
San Diego, California
Presentation Date
27 May 2010, 4:30 pm - 6:20 pm
Abstract
Analyses were conducted on the seismic performance of a proposed offshore gas flowline, which connects a manifold in 830-m water depth to a riser platform in shallow waters of the outer continental shelf. Climbing a 10-degree continental slope, the flowline will be installed on the seafloor underlain by deep carbonate sediments of sands and silty clays. Two types of analyses were performed for a critical segment of the flowline, where it traverses a narrow ridge flanked by two deep submarine canyons: (1) probabilistic analyses using simplified empirical methods; and (2) deterministic 2D and 3D analyses with FLAC using a nonlinear, effective-stress soil model fully coupled with an empirical pore-pressure generation scheme. Soil properties were derived from PCPT and T-bar data, Bender element tests, and monotonic and cyclic direct simple shear tests. The analysis results indicated an extremely small likelihood of liquefaction along the flowline, with only small deformations predicted to occur for ground motions with a return period of 5,000 years.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
5th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2010 Missouri University of Science and Technology, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Roth, Wolfgang H.; Crouse, C. B.; Dawson, Ethan M.; and Su, Bei, "Seismic Performance Evaluation of a Submarine Gas Pipeline" (2010). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 30.
https://scholarsmine.mst.edu/icrageesd/05icrageesd/session04b/30
Included in
Seismic Performance Evaluation of a Submarine Gas Pipeline
San Diego, California
Analyses were conducted on the seismic performance of a proposed offshore gas flowline, which connects a manifold in 830-m water depth to a riser platform in shallow waters of the outer continental shelf. Climbing a 10-degree continental slope, the flowline will be installed on the seafloor underlain by deep carbonate sediments of sands and silty clays. Two types of analyses were performed for a critical segment of the flowline, where it traverses a narrow ridge flanked by two deep submarine canyons: (1) probabilistic analyses using simplified empirical methods; and (2) deterministic 2D and 3D analyses with FLAC using a nonlinear, effective-stress soil model fully coupled with an empirical pore-pressure generation scheme. Soil properties were derived from PCPT and T-bar data, Bender element tests, and monotonic and cyclic direct simple shear tests. The analysis results indicated an extremely small likelihood of liquefaction along the flowline, with only small deformations predicted to occur for ground motions with a return period of 5,000 years.
