TY - GEN
T1 - Case Histories of Multi-Layer Interface Tests for Composite Liners and Comparison to Single Interface Tests
AU - Shenthan, Thevachandran
AU - Khilnani, Kris
AU - Stark, Timothy D.
N1 - Publisher Copyright:
© 2019 American Society of Civil Engineers.
PY - 2019
Y1 - 2019
N2 - This paper presents multi-layer interface shear test results for composite liner systems from fourteen landfill projects in California. The multi-layer configuration utilizes site-specific materials including low-hydraulic conductivity compacted soil (CSL), geosynthetic materials [geosynthetic clay liner (GCL), geomembrane (GM), drainage geocomposite (GC), and geotextile (GT)], leachate collection and removal system (LCRS) gravel, and/or protective cover soil (PCS), as applicable. This paper describes the test configuration and test procedures to represent field configurations, including soaking and saturation conditions, choice of normal stresses, and California Water Board recommended procedures for calculating shear strengths for encapsulated GCLs. The importance of simulating field conditions is discussed. In addition, a comparison was made between results from single and multi-layer interface tests for two of the projects. This paper also includes a discussion of pros and cons of multi-layer interface tests compared to single interface tests.
AB - This paper presents multi-layer interface shear test results for composite liner systems from fourteen landfill projects in California. The multi-layer configuration utilizes site-specific materials including low-hydraulic conductivity compacted soil (CSL), geosynthetic materials [geosynthetic clay liner (GCL), geomembrane (GM), drainage geocomposite (GC), and geotextile (GT)], leachate collection and removal system (LCRS) gravel, and/or protective cover soil (PCS), as applicable. This paper describes the test configuration and test procedures to represent field configurations, including soaking and saturation conditions, choice of normal stresses, and California Water Board recommended procedures for calculating shear strengths for encapsulated GCLs. The importance of simulating field conditions is discussed. In addition, a comparison was made between results from single and multi-layer interface tests for two of the projects. This paper also includes a discussion of pros and cons of multi-layer interface tests compared to single interface tests.
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U2 - 10.1061/9780784482087.031
DO - 10.1061/9780784482087.031
M3 - Conference contribution
AN - SCOPUS:85063599031
SN - 9780784482087
T3 - Geotechnical Special Publication
SP - 331
EP - 343
BT - Geotechnical Special Publication
A2 - Meehan, Christopher L.
A2 - Kumar, Sanjeev
A2 - Pando, Miguel A.
A2 - Coe, Joseph T.
PB - American Society of Civil Engineers
T2 - 8th International Conference on Case Histories in Geotechnical Engineering: Earth Retaining Structures and Geosynthetics, Geo-Congress 2019
Y2 - 24 March 2019 through 27 March 2019
ER -