UJI DISPERSIVITAS BAHAN TIMBUNAN BENDUNGAN DURIANGKANG
ABSTRACT: Dispersive clays
have been identified
as soils which
highly erosive because
they have a
higher percentage ofdissolve sodium in their pore water than
ordinary clays. The dominant sodium ions increase the thickness of the diffuseddouble water
layer surrounding the
individual clay particles.
This causes the
repulsive forces to
exceed the attractive forces so
that the individual
clay particles go
into suspension in
the presence of
water. Their detrimental
effect on the performance of
dams, canals has
been recognized. Piping in
earth dams which
lead to the
failure of dams
due to the presence of dispersive clays has been
identified in Australia, United States, South Africa and many countries
throughout the world. This research
presented the tests
using various available
methods to identify
the degree of
dispersive of embankment material
for Duriangkang dam,
the first estuary
dam in Indonesia.
Analyses to the
results were also discussed. The
decision not to
include the suspected
dispersive and moderate
dispersive clays in
the embankment of Duriangkang dam was taken in order to
minimize the risk of eroded and piping progress in the dam body.
Keywords: dispersive clays,
embankment dam, erosive, piping
Penulis: Didiek Djarwadi
Kode Jurnal: jptsipildd070001
