Environmental Engineering Reference
In-Depth Information
Figure 18.27. Limits of groutability (based on Karol, 1985).
Table 18.8. Limits of grouting (Caron, 1982).
Type of ground
Coherent fissured soils Loose granular soils
Coarse and
Type of grouting
Large medium fissures
Very fine fissures
medium
Fine
10
7
m/sec
10
7
m/sec
10
3
m/sec
10
3
m/sec
method
K
5
K
5
K
K
By fracturing
-
-
C
C
By impregnation
C
CG
C
CG
By fracturing
-
-
-
CG
C
cement based grout; CG
chemical grouting; -
no case for grouting.
Caron (1982) suggests Table 18.8 as a basis for determining whether grouting is prac-
ticable, depending on ground conditions and the type of grout.
It is hard to envisage a case where grouting of soils with a permeability around
10
7
m/sec would be warranted or would result in significant reduction in permeability.
18.4.3
Grouting technique
The basic approach to use of chemical grouts is similar to that for cement grouts:
-Grout is injected into holes under pressure;
-Holes are drilled and grouted in stages to achieve a desired Lugeon or permeability closure;
