Geology Reference
In-Depth Information
Figure 4.7
Visualisation of Pos
Selim landslide,
Malaysia, showing
displacement
vectors over a
two-year period
(after Malone et al.,
2008).
images such as infra-red can help interpretation, for example, of
vegetation and seepage.
4.3.3 Planning a ground investigation
BS 5930 and most textbooks on site investigation provide good
information on techniques and procedures but little advice on how to
plan a ground investigation or on how to separate and characterise
geotechnical units within a geological model. They also say little
about how to anticipate hazards, which is a key task for the engineer-
ing geologist. It is important to take a holistic view of the geological
and hydrogeological setting
-
the
'
total geological model
'
approach
of Fookes et al.
but the
geological data need to be prioritised to identify what is really impor-
tant to the project and to obtain the relevant parameters for safe
design.
The problem is that there are so many things that might potentially
go wrong at sites and with alternatives for cost-effective design that it is
sometimes dif
(2000), as discussed in Chapter 3
-
cult to know where to start in collecting information.
One might hope that simply by following a code of practice, that
would be enough, but, in practice, the critical detail may be over-
shadowed by relatively irrelevant information collected following
routine drilling and logging methodology.
One approach that can be useful for planning and reviewing data
from a ground investigation, and focusing on critical information, is to
 
 
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