Environmental Engineering Reference
In-Depth Information
P1
P2
B1
P3
B2
B3
Legend
Joints
Bedding
P1, P2, P3
Packer locations for tests 1, 2, 3
B1, B2, B3
Base of hole for tests 1, 2, 3
Figure 5.31.
Borehole inclined to intersect joints in the rock.
Figure 5.32.
Layout of packer test equipment.
-a pump to supply water under pressure;
-a bypass to control the pressure;
-a surface tank at the borehole to maintain the water level outside the water line;
- water storages;
-a pressure gauge;
-a water meter.
A layout used for water pressure testing is shown on Figure 5.32.
5.14.4.1
Packers
There are several types of packer used:
-A
hydraulic packer
(
Figure 5.33
) consists of a double tube with rubber sleeve. When
the packer is in the “down” position water can be pumped into the sleeve to inflate the
packer and seal the hole. In the “up” position water flows into the test section;
