DYNAMIC LATERAL PRESSURES DUE TO SATURATED BACKFILLS ON RIGID WALLS

This experimental study examines the dynamic water pressure generated in a variety of backfill soil types from gravel to clayey soils. The experiments include rigid nonyielding model retaining wall tests with saturated sandy and cohesive backfills on a one-directional horizontal shaking table. Researchers discovered that dynamic water pressure against the wall is generated due to two different sources: 1) the Westergaard-type flow of free water in nondeformable backfill skeleton and 2) the deformability of backfill soil skeleton under undrained conditions. For highly permeable backfill soils, the first source dominates in the generation of pore pressure; for cohesive soils, the second source dominates. The second type dynamic water pressure distributes in such a way that there is a peak at an upper section of the backfill and decreases to zero at the bottom of the backfill. The dynamic total pressure resultants for cohesive backfills are nearly twice the Westergaard's dynamic water pressure resultant. Applied vibrating frequency and the coefficient of volumetric compressibility do not significantly impact dynamic water and total pressures.

Language

  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 1747-67
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00667496
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 18 1994 12:00AM