American Society of Civil Engineers


Compacted Soil Liner Interface Strength Importance


by Timothy D. Stark, F.ASCE, (Professor, Dept. of Civil and Environmental Engineering, Univ. of Illinois, 205 North Mathews Ave., Urbana, IL 61801. E-mail: tstark@illinois.edu), Hangseok Choi, (corresponding author), (Associate Professor, School of Civil, Environmental, and Architectural Engineering, Korea Univ., Anam-Dong, Seongbuk-Gu, Seoul 136-713, South Korea. E-mail: hchoi2@korea.ac.kr), Chulho Lee, (Postdoctoral Research Associate, School of Civil, Environmental, and Architectural Engineering, Korea Univ., Anam-Dong, Seongbuk-Gu, Seoul 136-713, South Korea. E-mail: cryfreer@korea.ac.kr), and Brian Queen, (Environmental Engineer, Ohio Environmental Protection Agency, Southeast District Office, 2195 Front St., Logan, OH 431381. E-mail: brian.queen@epa.state.oh.us)

Journal of Geotechnical and Geoenvironmental Engineering, Vol. 138, No. 4, April 2012, pp. 544-550, (doi:  http://dx.doi.org/10.1061/(ASCE)GT.1943-5606.0000556)

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Document type: Case Studies
Abstract: This paper describes an interesting slope failure in a liner system of a municipal solid waste containment facility during construction because the sliding interface is not the geomembrane (GM)/compacted low-permeability soil liner (LPSL) but a soil–soil interface within the LPSL. Some of the lessons learned are as follows: (1) compaction of the LPSL should ensure that each lift is kneaded into the lower lift so a weak interface is not created in the LPSL; (2) the LPSL moisture content should be controlled so it does not exceed the specified value, for example 3–4% wet of optimum, because it can lead to a weak interface in the LPSL; (3) drainage material should be placed over the GM from the slope toe to the top to reduce the shear stresses applied to the weakest interface; and (4) equipment should not move laterally across the slope if it is unsupported but up the slope while placing the cover soil from bottom to top.


ASCE Subject Headings:
Slope stability
Landfills
Geomembranes
Geosynthetics
Shear strength
Liners

Author Keywords:
Slope stability
Landfills
Geomembranes
Geosynthetics
Compacted soil liner
Geosynthetic lined slopes
Interface shear strength