Environmental Engineering Reference
In-Depth Information
N
SPT
N
SPT
N
SPT
N
SPT
N
SPT
N
SPT
020 40
60 80 100 120
020 40
60 80 100 120
020 40
60 80 100 120
0
020406080 100 120
020406080 100 120
020406080 100 120
0
0
0
0
0
10
10
10
10
10
10
20
20
20
20
20
20
30
30
30
30
30
30
Granular tuffs
Breccious tuffs
Silty-clayey tuffs
Breccious tuffs
Granular tuffs
Silty-clayey tuffs
40
40
40
40
40
40
Figure 14.
standard penetration test results on β
2
tuffs.
Figure 13.
standard penetration test results on β
1
tuffs.
Figure 15.
Madeira's volcanic formations strength parameters for preliminary designing purposes.
test is it world wide use which allowed the crea-
tion of a large database of correlations, providing
a general idea about the strength and the relative
density of the soil.
The sPT results on β
1
and β
2
tuffs are presented
in Figures 13 and 14. in all cases the values are
widely scattered but a slightly tendency of increase
in the value of in
sPT
with depth can be noted. This
aspect is, in most cases, related to the geostatic
stress distribution which, due to these soils' gen-
esis, can be quite irregular.
7
ResUlTs coMPilaTion anD Final
consiDeRaTions
Table 1 presents a compilation of the expected
parameters values for the different materials stud-
ied. it is based on the available data information
and its interpretation presented above and also in
other studies from literature, and that can be used
for preliminary design purposes.
in addition to this table, the abacus of Figure 15
was prepared to show the overall strength and
