Soil improvement and construction methods in peat - Geotechnics of Organic Soils and Peat - page 126

Figure 6.4 Excavation and replacement.
Figure 6.5 Excavation and replacement of the Samariang ring road project ( after To h et al. , 1994).
replacement material up to the original ground surface, followed by another 2m of
earth fill to the road platform.
6.3 SURFACE REINFORCEMENT, PRELOADING AND
VERTICAL DRAIN
6.3.1 Surface reinforcement
Geotextile, geogrids, timber or bamboo mattresses can be used to separate granu-
lar embankment fill from the soft subsoil on which it is being placed and for tensile
reinforcement to increase the overall stability of the embankment. As a separator, the
geotextile prevents the fill from becoming contaminated by the weak subsoil mate-
rial. thus preserving the better load-bearing properties of the fill. As the fill becomes
thicker, the need for separation decreases and the geotextile then becomes a tensile