A Case History of Design and Construction of a Seismic-Resilient Outfall Pipe within Liquefiable Ground: Construction Challenges
Publication: Pipelines 2023
ABSTRACT
The Stage V expansion of the Annacis Island Wastewater Treatment Plant (AIWWTP) consisted of the design and construction of a new outfall system, which included an outfall diffuser system consisting of two 2.5 m diameter pipes buried within the highly liquefaction susceptible Fraser Riverbed. Subsurface soils surrounding the diffuser pipeline are vulnerable to lateral and vertical permanent ground displacements (PGDs) of 1.55 m and 0.30 m, respectively, due to potential liquefaction and lateral spreading hazards during the 2,475-year design seismic event. Construction of the outfall diffuser was very challenging due to several factors such as procurement of the special seismic steel pipe (SSSP) segments and other pipes from overseas fabricators, in-river and underwater construction, its location adjacent to a navigable channel, dredging, construction quality control during pandemic conditions, as well as fabrication, deployment, and construction of the outfall segments of the pipe while meeting the specification requirements. This paper presents a summary of the construction challenges encountered and the construction solutions implemented, with particular focus on how the construction of the outfall pipe buried within the bed of the Fraser River was accomplished. A companion paper presents the design challenges encountered in the project.
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Information & Authors
Information
Published In
Pipelines 2023
Pages: 407 - 419
History
Published online: Aug 10, 2023
ASCE Technical Topics:
- Buried pipes
- Construction (by type)
- Construction engineering
- Construction wastes
- Earthquake engineering
- Engineering fundamentals
- Environmental engineering
- Geotechnical engineering
- Infrastructure
- Pipeline systems
- Pipelines
- Pipes
- Pollutants
- Seismic design
- Seismic tests
- Solid wastes
- Special condition construction
- Steel construction
- Steel pipes
- Tests (by type)
- Underwater construction
- Underwater pipelines
- Wastes
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