MODELING FLOWSLIDES CAUSED BY STATIC LOADING

The phenomenon of liquefaction can occur in saturated loose sands and is characterized by a large strength or stiffness loss resulting in substantial deformation or a flowslide when subjected to rapid static or cyclic loading. To study this phenomenon, the Canadian geotechnical engineering community has started the Canadian Liquefaction Experiment (CANLEX), which has planned to include a large, controlled liquefaction event in the field. Numerical predictions of the response of this full-scale event will be compared with the field measurements. Centrifuge model tests are being conducted to aid in the design of the field event and to allow for calibration of numerical models. These tests could serve as a substitute for calibration of numerical models in the event that a dynamic field event is not possible or not conducted at the site. The first of these tests ascertained that a gravitational flowslide event could be induced under undrained static loading. A surcharge dropped on the crest of an equivalent 16-degree submerged 8.8-m-high slope of loose oil sand tailings caused the slope to liquefy and flow with deep-seated lateral movements throughout the soil slope to an angle of 7 degrees. A finite difference numerical model, calibrated against laboratory element test data, captured the essence of the observed undrained response of the centrifuge test in terms of pore pressure rise and deformation pattern. These modeling techniques will be used to evaluate other triggering mechanisms for the field event.

Language

  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 12-21
  • Monograph Title: Modeling and model verification; testing pavement layers and materials; and low-cost drainage structures
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00715539
  • Record Type: Publication
  • ISBN: 0309061725
  • Files: TRIS, TRB
  • Created Date: Jan 2 1996 12:00AM