Geology Reference
In-Depth Information
Figure 4.39
Comparison
between
discontinuity data
recorded by BIPS
(vertical drillhole)
and from surface
mapping
(horizontal scan
lines). After
Halcrow Asia
Partnership
(1998a).
Discontinuities measured in borehole (vertical)
Discontinuities measured in scanlines
employed during a large construction project include sound and
vibration meters, especially where blasting is to be carried out.
Piezometers are commonly installed as part of ground investiga-
tions to measure water pressures. Detailed information on these
and other instruments are given by Dunnicliff (2003). The simplest
device is an open-tube standpipe with a porous tip, installed in a
