00627125

Component

http://onlinepubs.trb.org...trr/1992/1369/1369-016.pdf

https://scholar.google.co...mmie&publication_year=1992

A series of clay samples molded at differing water contents was subjected to one-dimensional freezing and thawing, and the changes in permeability (hydraulic conductivity) were determined with respect to the number of freeze/thaw cycles. Triaxial permeability tests were performed at chamber pressures of 69 kPa (10 psi), resulting in observed increases in permeability of about one order of magnitude (a factor of 10), from 10 to the minus 8 power cm/sec to 10 to the minus 7 power cm/sec. The maximum permeability changes occurred in less than 10 freeze/thaw cycles. Permeability tests were also performed at various chamber pressures to determine the permeability-effective stress relationship. Permeability changes due to freezing and thawing are greatest at low effective stresses and decrease with increasing effective stress. The results can have important implications for landfill cover and liner design. The clay barrier for a cover system remains at a relatively low effective stress. Test results indicate that a permeability change of about two orders of magnitude can be expected because of freezing and thawing. Thus, the clay barrier in the cover system must be protected from freezing and thawing. Clay liners subjected to freezing and thawing, for example after construction and before waste placement, will show the same increase in permeability as for cover material. However, as the waste is placed, and hence the effective stress increased, the clay permeability will decrease. If sufficient waste, cover, and overburden material are placed on the clay liner, the permeability can decrease to an acceptable value.

This paper appears in Transportation Research Record No. 1369, Advances in Geotechnical Engineering. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01404952

English

p. 126-129

1992

Transportation Research Record

0309054109

Figures (4) ; References (12) ; Tables (1)

Compacted clays; Design; Effective stress; Freeze thaw durability; Freezing; Laboratory tests; Landfills; Moisture content; Permeability; Permeability coefficient; Thaw

Freeze thaw cycles

Design; Geotechnology; Highways; I42: Soil Mechanics

TRIS, TRB

Mar 18 1993 12:00AM

• APPLICATION OF A TEST FILL AT A LAYERED CLAY SITE
• CENTRIFUGAL MODELING OF CONSOLIDATION PHENOMENA
• CHARACTERIZATION OF RESILIENT MODULUS OF COMPACTED SUBGRADE SOILS USING RESONANT COLUMN AND TORSIONAL SHEAR TESTS (WITH DISCUSSION AND CLOSURE)
• CHARACTERIZATION OF SATURATED GRANULAR BASES UNDER REPEATED LOADS
• EFFECT OF FREEZE-THAW ON THE HYDRAULIC CONDUCTIVITY OF THREE COMPACTED CLAYS FROM WISCONSIN
• EFFECTS OF DESICCATION ON THE HYDRAULIC CONDUCTIVITY VERSUS VOID RATIO RELATIONSHIP FOR A NATURAL CLAY
• EROSION RESISTANCE OF COMPACTED SOILS
• FIELD EXPERIMENTS ON SOILS REINFORCED WITH MULTIORIENTED GEOSYNTHETIC INCLUSIONS
• FROST EFFECTS IN SOIL-STEEL BRIDGES
• GEOGRIDS AS A REHABILITATION REMEDY FOR ASPHALTIC CONCRETE PAVEMENTS
• GROUND IMPROVEMENT AND TESTING OF RANDOM FILLS AND ALLUVIAL SOILS
• INVESTIGATION OF SOIL NAILING SYSTEMS
• PERFORMANCE OF WICK DRAINS AT WINDSOR, CONNECTICUT
• RESILIENT TESTING OF SOILS USING GYRATORY TESTING MACHINE (WITH DISCUSSION AND CLOSURE)
• UPDATE ON IN SITU TESTING FOR GROUND MODIFICATION TECHNIQUES
• VERIFICATION OF SURFACE VIBRATORY COMPACTION OF SAND DEPOSIT