SHV f
2w
The pavment overlay fabric or geogrid-asphalt system illustrated in Fig. 21.3 also retards
reflective crack development in the overlay by providing flexible stress relieving layer between
the pavement and overlay.
p 2PIP q "# 22 2f )p 2PIQ s 2 &
2i# # 2y2
&2
If the foundation soils underlying the embankment
are too weak to permit the construction of an embankment to the required height, then
geosynthetic-reinfored embankments (Fig. 21.4) can provide considerable savings over
conventional construction method including soil displacement and stabilizing berms. Both
geotextiles and/or geogrids can serve this function.
p 2PIR )2i%+% 222 2
2 &
# In highway construction, roads may be widened without
increasing necessary right-of-way by replacing a conventional flat slope with a steep reinforced
one. This allows for more efficient land use. In private developments, the amount of useable
land within a given area is increased without the cost of a traditional retaining wall. Figure 21.5
illustrates typical uses.