Prediction of Seismically-Induced Settlement along the LNWI (Southport) Pipeline

Interceptor sewers, with diameters generally greater than 1.5 m (5 ft), traverse long distances from their terminating sewage treatment plants as well as cross varied geologic materials and numerous physical features. Routing of portions of pipelines often positions their alignments in lowland, flood plains which typically contain unconsolidated alluvial deposits, and adjacent to watercourses to minimize impacts on existing improvements. Invert grades can be deep when compared to other utility grades and at times pipelines must be located within local groundwater aquifers. Pipeline design in seismically active areas requires that combinations of potential earthquake shaking, high groundwater levels and granular foundation soils be evaluated for the potential of pipeline settlement or buoyancy. This paper presents the conditions and methodologies used for such predictions for portions of the Lower Northwest Interceptor (LNWI) project to be constructed in Yolo County, California. The total length of the LNWI project is approximately 31 km (19 mi). A Standard Penetration and Cone Penetration Test subsurface program involving exploration spacings of 152.5 to 305 m (500 to 1000 ft) along the planned pipeline permitted the gathering of much subsurface soil and groundwater information as well as soil samples for characterization of material types, grain size characteristics, and fines contents. A summary of alignment subsurface conditions is presented for the portions of the LNWI alignment and methods used for determination of potential levels of earthquake shaking, liquefaction potential, and estimates of settlement are evaluated.

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; References; Tables;
  • Pagination: 10p
  • Monograph Title: Pipeline Engineering and Construction: What's on the Horizon? Proceedings of the Pipelines 2004 International Conference, August 1-4, 2004, San Diego, California

Subject/Index Terms

Filing Info

  • Accession Number: 01003256
  • Record Type: Publication
  • ISBN: 0784407452
  • Files: TRIS
  • Created Date: Aug 23 2005 8:41AM