Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Steel Water Transmission Mains in Liquefiable Soils in Hillsboro, Oregon, Planning Considerations
Soil liquefaction has long been recognized as one of the greatest hazards for the integrity and performance of water transmission systems during and after major earthquakes. The effects of soil liquefaction include relatively large magnitudes of permanent ground deformations (PGD) in the form of vertical settlements and horizontal movements (lateral spreading). The effects can also include loss of soil strengths and flotation. Pipeline performance during previous major earthquakes showed that flexible, durable, strong pipes and joints can tolerate some degree of the liquefaction induced deformations. Welded steel pipe is considered one of the better seismic performing pipes. In some degrees, steel pipe can withstand plastic yield but still maintain integrity and service during and after earthquakes. For steel water transmission system planning and design, overall assessment of liquefaction hazards, appropriate route selection, pipe thickness and weld selection are the crucial elements. For deep pump stations and vault structures, foundation failure and flotation of the liquefiable soils should also be considered. At some locations pipe supports or ground improvements can provide some advantages in liquefaction mitigation. Flexible/extendable joints can also provide additional benefits. However, these additional mitigation features are typically associated with relatively high costs. In some significant PGD zones (i.e. forefront of the lateral spreading zone) with prohibitive mitigation costs, considerations can be given for planning emergency repairs and bypass at controlled, accessible location. This paper/presentation explores necessary geotechnical and liquefaction hazards assessments, steel pipe and joints evaluations, and mitigation method selections to optimize construction cost and seismic resiliency requirements for an approximately 30 mile long water transmission main project for the City of Hillsboro and Tualatin Valley Water District (TVWD) in Washington County, Oregon.
Steel Water Transmission Mains in Liquefiable Soils in Hillsboro, Oregon, Planning Considerations
Soil liquefaction has long been recognized as one of the greatest hazards for the integrity and performance of water transmission systems during and after major earthquakes. The effects of soil liquefaction include relatively large magnitudes of permanent ground deformations (PGD) in the form of vertical settlements and horizontal movements (lateral spreading). The effects can also include loss of soil strengths and flotation. Pipeline performance during previous major earthquakes showed that flexible, durable, strong pipes and joints can tolerate some degree of the liquefaction induced deformations. Welded steel pipe is considered one of the better seismic performing pipes. In some degrees, steel pipe can withstand plastic yield but still maintain integrity and service during and after earthquakes. For steel water transmission system planning and design, overall assessment of liquefaction hazards, appropriate route selection, pipe thickness and weld selection are the crucial elements. For deep pump stations and vault structures, foundation failure and flotation of the liquefiable soils should also be considered. At some locations pipe supports or ground improvements can provide some advantages in liquefaction mitigation. Flexible/extendable joints can also provide additional benefits. However, these additional mitigation features are typically associated with relatively high costs. In some significant PGD zones (i.e. forefront of the lateral spreading zone) with prohibitive mitigation costs, considerations can be given for planning emergency repairs and bypass at controlled, accessible location. This paper/presentation explores necessary geotechnical and liquefaction hazards assessments, steel pipe and joints evaluations, and mitigation method selections to optimize construction cost and seismic resiliency requirements for an approximately 30 mile long water transmission main project for the City of Hillsboro and Tualatin Valley Water District (TVWD) in Washington County, Oregon.
Steel Water Transmission Mains in Liquefiable Soils in Hillsboro, Oregon, Planning Considerations
Mucibabic, Nebojsa “Nesh” (Autor:in) / Lang, Yuxin “Wolfe” (Autor:in) / Wubbena, Tyler (Autor:in)
Pipelines 2015 ; 2015 ; Baltimore, Maryland
Pipelines 2015 ; 1419-1430
17.08.2015
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Hillsboro Stadium, Hillsboro, Oregon
British Library Online Contents | 2000
Feature Stories - Engineering Awards of Excellence - Hillsboro Stadium, Hillsboro, Oregon
Online Contents | 2000
Water Treatment Plant Seismic Risk Assessment for the Joint Water Commission, Hillsboro, Oregon
| British Library Conference Proceedings | 2009
NTIS | 1970
Hillsboro Canal Bridge Monitoring
| NTIS | 2011