PORE-WATER PRESSURE CHANGES DURING SOIL LIQUEFACTION

An analytical procedure is presented for evaluating the general characteristics of pore-water pressure buildup and subsequent dissipation in sand deposits both during and following a period of earthquake shaking. It is shown that in layers of fine sand, excess hydrostatic pressures may persist for an hour or more after an earthquake. However evidence of subsurface liquefaction may not appear at the ground surface until several minutes after the shaking has stopped and the critical condition at the ground surface may not develop until 10 min-30 min after the earthquake. However, for coarse sands and gravels with an impedance of drainage due to the presence of sand seams or layers, pore pressures generated by earthquake shaking may dissipate so rapidly that no detrimental build-up of pore pressure or a condition appreaching liquefaction can develop. Improving the drainage capability of a sand deposit may thus provide an effective means of stabilizing a potentially unstable deposit. Analyses of the type described also provide the means for assessing whether subsurface liquefaction will have any serious effects on structures supported near the ground surface. /ASCE/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/3519342
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Seed, H B
  • Martin, P P
  • LYSMER, J
• Publication Date: 1976-4

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 323-346
• Serial:
  • Journal of Geotechnical and Geoenvironmental Engineering
  • Volume: 102
  • Issue Number: GT4
  • Publisher: American Society of Civil Engineers
  • ISSN: 1090-0241
  • Serial URL: http://ojps.aip.org/gto

Subject/Index Terms

• TRT Terms: Analysis; Coarse grained soils; Drainage; Earthquakes; Gravel; Hydrostatic pressure; Liquefaction; Mineral deposits; Pore water pressures; Sand; Soil structure interaction; Structures
• Old TRIS Terms: Deposits; Liquefaction (Soil)
• Subject Areas: Bridges and other structures; Geotechnology; Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00133979
• Record Type: Publication
• Report/Paper Numbers: Proc. Paper #12074
• Files: TRIS
• Created Date: Jun 5 1976 12:00AM