Comparison between deformation
modulus of rock mass measured by plate
jacking and dilatometer tests. For determination
of the in-situ deformation modulus of
rock mass at Bakhtiari Dam site, located in
south-west of Iran, plate jacking tests (PJT)
and dilatometer tests (DLT) carried out during
the geotechnical investigations. In this
study, the results of PJTs and DLTs were
compared. This comparison involves 89 vertical
and horizontal PJTs and 83 DLTs carried
out in 6 rock units of Sarvak formation. Although,
both PJTs and DLTs in the Bakhtiari
Dam site were performed in same geological
and geotechnical conditions, but there
are not sufficient side by side data to make
a paired two samples correlation. Therefore,
the mean of in-situ data was compared at
each rock unit. Besides Mann–Whitney U
tests were performed to compare in-situ test
results. The comparison shows that the deformation
modulus measured by both methods
has no significant differences. However,
in low quality rock masses the moduli measured
by the use of DLTs were greater than the
modulus measured by PJTs. Conversely, in
high quality rock masses the results of PJTs
were greater than DLT’s.
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