What are the geotechnical aspects of landfill design?

Landfill geotechnics involves: (1) Liner system design - composite clay/geomembrane with leak detection, (2) Slope stability - waste strength parameters (c = 5-25 kPa, phi = 25-35 degrees), veneer stability on liner, (3) Settlement prediction - waste compression (primary = 10-20%, secondary continuing years), (4) Leachate collection - drainage layer design, (5) Gas collection considerations, (6) Foundation design for waste mass, (7) Cover system - final cap with drainage, gas venting. Unique challenges include variable waste properties, decomposition effects, and long-term performance requirements.