Water Science and Engineering 2008, 1(4) 22-35  DOI:   10.3882/j.issn.1674-2370.2008.04.003   ISSN: 1674-2370 CN: 32-1785/TV

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geosynthetic multilayer liner
failure interface
shear strength
leachate level
Qian Xuede
Article by

Critical interfaces in geosynthetic multilayer liner system of a landfill

Qian Xuede*1, 2, 3

1. Michigan Department of Environmental Quality, Waste and Hazardous Materials Division, Lansing, Michigan 48913, U. S. A.
2. College of Civil Engineering, Hohai University, Nanjing 210098, P. R. China
3. College of Environmental Science and Engineering, Hohai University, Nanjing 210098, P. R. China


This study is to identify the critical interface in a geosynthetic multilayer liner system by examining the effects of the interface shear strength of liner components, leachate level, leachate buildup cases, and peak and residual interface strengths. According to current landfill design procedures, conducting stability analysis along the same interface at both the back slope and base may result in a non-conservative result. The critical interfaces with the minimum factor of safety are generally found at different locations along the back slope and base. The critical interface for a multilayer liner system cannot simply be assumed during stability analysis. It can shift from one interface to another with changes in the leachate level and with different leachate buildup cases. The factor of safety for an interface with a high friction angle and low apparent cohesion generally drops much more quickly than it does under inverse conditions when the leachate level increases. The failure interface in a liner system under residual conditions is usually different from the failure interface under peak conditions.

Keywords landfill   geosynthetic multilayer liner   failure interface   shear strength   leachate level   seepage  
Received 2008-10-09 Revised 2008-12-07 Online:  
DOI: 10.3882/j.issn.1674-2370.2008.04.003
Corresponding Authors: Qian Xuede
About author:

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