Location
St. Louis, Missouri
Date
03 Jun 1993, 2:00 pm - 4:00 pm
Abstract
Loess, which consists predominantly of low plasticity to non-plastic silt (PI≤10) with varying amounts of sand and clay-sized (- 5 microns) material, covers much of north-central Oregon and eastern Washington. Several landfills operate in this area. Because of the lack of clayey soils and clayey bedrock in the region, loess was proposed for use as the low permeability soil barrier layer. Laboratory testing and large-scale field tests of test fills using SDRI's have shown that the remolded permeability of the loess is related to grain-size, soil gradation, and the percent saturation of the placed soil. We had an approximately 1:1 correlation between the permeability results of laboratory remolded samples, undisturbed Shelby tube samples of test fills, and field SDRI tests. Data from six different sites have consistently shown that in order to achieve a permeability of less than 1x10-6 cm/s, the loess must contain greater than 70 percent minus U.S. No. 200 sieve and have at least 15 percent minus 5 microns material. In addition, the loess must be placed at a minimum of 2 percent over standard Proctor optimum moisture content and be compacted to a dry density which corresponds to a minimum of 85 percent saturation at the measured moisture content.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
3rd Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 1993 University of Missouri--Rolla, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Knitter, Clifford C.; Haskell, K. G.; and Peterson, M. L., "Use of Low Plasticity for Soil Liners and Covers" (1993). International Conference on Case Histories in Geotechnical Engineering. 5.
https://scholarsmine.mst.edu/icchge/3icchge/3icchge-session12/5
Use of Low Plasticity for Soil Liners and Covers
St. Louis, Missouri
Loess, which consists predominantly of low plasticity to non-plastic silt (PI≤10) with varying amounts of sand and clay-sized (- 5 microns) material, covers much of north-central Oregon and eastern Washington. Several landfills operate in this area. Because of the lack of clayey soils and clayey bedrock in the region, loess was proposed for use as the low permeability soil barrier layer. Laboratory testing and large-scale field tests of test fills using SDRI's have shown that the remolded permeability of the loess is related to grain-size, soil gradation, and the percent saturation of the placed soil. We had an approximately 1:1 correlation between the permeability results of laboratory remolded samples, undisturbed Shelby tube samples of test fills, and field SDRI tests. Data from six different sites have consistently shown that in order to achieve a permeability of less than 1x10-6 cm/s, the loess must contain greater than 70 percent minus U.S. No. 200 sieve and have at least 15 percent minus 5 microns material. In addition, the loess must be placed at a minimum of 2 percent over standard Proctor optimum moisture content and be compacted to a dry density which corresponds to a minimum of 85 percent saturation at the measured moisture content.
