Environmental Engineering Reference
In-Depth Information
30 m
+6m
N
4
9
12
18
C
N
5
8
4
2
19
30
C
N
N
9
10
11
2
0
3
36
C
50 m
+3 m
6
12
6
3
2
2
1
5
21
C
As
Ao
Rs
As
Rs
R
dec
TB1
TB2
+10 m
Gn
TB4
TB3
N
Designer's
building level
17
16
33
27
29
C
N
Cs
N
2
11
21
30
11
20
C
−
3 m
Rs
9
10
6
7
10
12
C
Legend:
N
As
−
blows, SPT
R
dec
TP
−
test boring number
Gn
−
GWL
TB6
As
alluvial sands
−
Ao
organic soils
Rs
−
residual soils
Cs
−
colluvial soils
R
dec
−
decomposed rock
Gn
−
sound gneiss
C
−
cored
Scale: H = V
−
TB7
TB8
(a)
30 m
+ 6 m
Site preparation
level + 3 m
4
9
12
18
5
8
4
2
+ 3 m
9
10
11
2
0
3
36
C
As
Ao
Rs
Possible
excavation
levels
As
As
Rs
+ 10 m
TB3
Rs
+ 3 m
R
dec
−
3m
50 m
29
C
30
11
20
C
R
dec
Gn
TB6
(b)
TB7
FIGURE 2.90
Geologic diagrams illustrate conditions at and below the building level proposed by the designer for a Class I
structure in a nuclear power plant complex where support on material of only one type is required. The
diagrams show clearly the conditions for foundations and for excavation support. To reach decomposed rock a
maximum excavation of 13 m is required and to reach sound rock, 15 m. Backfill would be controlled fill or
rollcrete depending on requirements of the licensing agency. (a) Geologic conditions; (b) geologic conditions at
designer's building level.
