LIQUEFACTION TESTING OF STRATIFIED SILTY SANDS

The cyclic behavior of stratified silty sandy soils is at present poorly understood, yet these materials are commonly found in alluvial deposits and hydraulic fill, which have a history of liquefaction during earthquakes. The main objective of this research project was to compare the behavior of stratified and homogeneous silty sands during seismic liquefaction conditions for various silt contents and confining pressures. A comprehensive experimental program was undertaken in which a total of 150 stress-controlled undrained cyclic triaxial tests were performed. Two methods of sample preparation were used for each soil type. These methods included moist tamping (representing uniform soil conditions) and sedimentation (representing layered soil conditions). The silt contents ranged from 10% to 50%, and confining pressures in the range of 50-250 KPa were considered. The results indicated that the liquefaction resistances of layered and uniform soils are not significantly different, despite the fact that the soil fabric produced by the two methods of sample preparation is totally different. The findings of this study justify applying the laboratory test results to the field conditions for the range of variables studied.

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  • Supplemental Notes:
    • This research was supported by the Army Research Office (ARO) under grant numbers 32451-GS-ISP and 32708-AAS and in part by the National Science Foundation under grant number HRD-9627989 and the Air Force Office of Scientific Research under grant number F49620-97-9345.
  • Corporate Authors:

    American Society of Civil Engineers

    1801 Alexander Bell Drive
    Reston, VA  United States  20191-4400
  • Authors:
    • Amini, F
    • Qi, G Z
  • Publication Date: 2000-3

Language

  • English

Media Info

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Filing Info

  • Accession Number: 00788966
  • Record Type: Publication
  • Contract Numbers: CMS-9309345, 32451-GS-ISP, 32708-AAS
  • Files: TRIS
  • Created Date: Mar 22 2000 12:00AM