Environmental Engineering Reference
In-Depth Information
Residual soils grading to saprolite
Ancient slide scar
Colluvium
Test boring
Alluvium
FIGURE 7.11
Slope and valley condition of colluvium
overlying alluvium (Jacarepaquá, Rio de
Janeiro, Brazil).
N
0
20
Gray-brown gravelly, clayey,
C-F sand
(heterogenous, angular gravel,
hard and dry to moist)
50
10
60
1
gray organic silt,
occasional C-F sand
and shells
(very soft)
Dark -
20
1
1
1
30
3
Dark - gray clayey silty sand
Gray C-F sand
(Artesian
6
13
water flowed to
surface from casing)
FIGURE 7.12
(Below left) Log of test boring in deposit of colluvium overlying alluvium as shown on geologic section in
Figure 7.11. Note water level and artesion conditions.
FIGURE 7.13
(Above right) Strong colluvium in Figure 7.12.
FIGURE 7.14
(Below right) Soft clayey alluvium in Figure 7.12.
 
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