Studying the Fracture System of a Landslide by ERT Method
2014
In contrary to former researches which used to stud
y the sliding surface or the water content
of certain layers of a landslide area we investigat
ed the near-surface fracture system of it. It
makes possible the delineation of the endangered ar
ea and gives information about the inner
structure of the landslide. For this aim Electrica
l Tomography (ERT) measurements were
carried out by different geoelectric configurations
. Due to the different conditions of the
fractures they can be both conductive and resistive
ones and even it is possible that a part of
them is conductive while the remaining part is resi
stive in the function of the filling material
and the time passed since the last rainfall. This f
eature and the probably high density of the
fractures make the interpretation of the ERT data r
ather difficult. The Schlumberger and
especially the Dipole-Dipole results proved to be a
lmost inutile, while the Pole-Dipole and
especially the Stummer array results seem to be muc
h more perspective. The results of these
arrays were compared to the Pressure-Probe data we
got on the same profile. Using the ERT
results a lot of fractures were detected and more o
r less well localised and on the basis of the
fractures the research area could have been divided
into several domains which are
differently fractured. It emerged among others that
even in the not-yet sliding area there are
fractures that is a part of this area tends to be m
ore and more dangerous, as well.
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