INTRODUCTION (2008)
a. A cellular confinement system (CCS) is a three-dimensional honeycomb-shaped structure of
interconnected individual geocell units. Geocells are typically formed from high-density polyethylene
sheet strips connected in series, using full-depth ultrasonic welded seams, aligned perpendicular to the
longitudinal axis of the strips. When expanded, the interconnected strips form the walls of the flexible,
three-dimensional structure - Figure 1-10-2. Cohesionless granular material is then added to the
structure and compacted. When compacted, it produces an interaction structure, resulting in an
increase in bearing capacity over that of the unconfined granular material. Typically, for roadbed load
support, the CCS should be placed below the ballast section in the subballast or subgrade as determined
by the Engineer.