LIQUEFACTION-INDUCED LATERAL SPREADING OF MILDLY SLOPING GROUND. TECHNICAL NOTE

The behavior of two mildly sloping ground models subjected to earthquake loading and liquefaction was examined via dynamic centrifuge modeling. The first model consisted of a uniform layer of saturated sand; the second model consisted of a layer of sand overlain by a less permeable layer of nonplastic silt. The model slopes were constructed at an angel of 2.6 degrees. Time histories of acceleration, excess pore-water pressure, and displacement are presented for the models. Photographs depict the mechanisms of failure. In both tests, approximately 0.8 m of prototype lateral displacement was recorded at the surface. The uniform sand model exhibited a distributed lateral displacement throughout much of the layer; however, the layered model displayed a concentrated displacement along the interface between soil layers. This concentrated displacement is consistent with a reduction in the sliding resistance between the silt and the sand layers due to the redistribution of voids at the interface. Consequently, care must be taken when using undrained strengths in the postliquefaction analysis of layered slopes to negate the possibility of redistribution of voids.

Language

  • English

Media Info

  • Features: Appendices; Figures; References;
  • Pagination: p. 2236-43
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00675557
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 30 1995 12:00AM