Unsaturated hydraulic conductivities were measured for two compacted fine-grained soils used as barrier layers in landfill final covers. The instantaneous profile method was used for the laboratory and field measurements. Test results reveal similar unsaturated hydraulic conductivities for the two soils in both laboratory and field measurements. In addition, results of laboratory tests performed with samples prepared at different molding water contents and compactive efforts show that the unsaturated hydraulic conductivity function is insensitive to molding water content for matric suctions exceeding 20 m, but is strongly affected by compactive effort. Samples compacted with modified Proctor effort had unsaturated hydraulic conductivities nearly one order of magnitude lower than those compared with a standard Proctor effort. Investigators also found that estimated unsaturated hydraulic functions based on parameters describing the soil-water characteristic curve underestimate the unsaturated hydraulic conductivity function of these barrier soils.


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Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 565-576
  • Serial:

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Filing Info

  • Accession Number: 00726120
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 26 1996 12:00AM