Geotechnics Project: Faculty of Civil and Enviromental Engineering
Geotechnics Project: Faculty of Civil and Enviromental Engineering
Geotechnics Project: Faculty of Civil and Enviromental Engineering
GEOTECHNICS PROJECT
GROUP MEMBERS:
1. MUHAMAD TAUFIK@ADAM B ABD RASHID
2. MOHD SHAUTI BIN GHAZALI@MOHD ZAIN
3. FARAH SOFHIA BINTI MOHD ZIN
4. RAJA JULALI BINTIRAJA ALI
5. AMIRAH SILMI BINTI AHMAD SHAKRI
LECTURER:
MR. KHAIRUL NIZAR BIN YUSOF
VERTICAL
DRAIN
WHAT?
HOW? WHY?
5W1H
WHO? WHERE?
WHEN?
WHAT
well, pipe, pit, or bore in porous,
underground strata into which
drainage water can be discharge
without contaminating any
groundwater resources
TYPES :
artificially-created drainage paths 1)sand drains
which are inserted into the soft
clay subsoil 2)fabric encased sand drains
3)prefabricated sand drains
VERTICAL
DRAIN
VERTICAL DRAIN
PREFABRICATED VERTICAL
DRAIN (PVD)
A band-shaped(rectangular cross section) consist of
synthetic geotextile “jacket” sorrounding a plastic core
THE APPROVAL
on rolls
HOW
Th
e
rol
ls
are
mo
unt
ed
on
the
ins
tall
ati
on
rig
s
on
sit
e
for
ins
tall
ati
on
The
Immediately
ThePVD
The areafter
drain
pore-waterinstalled
is inserted
tension into
the soil with a
installation the drain starts
into the compressible
is dissipated and
special installation
to wick the pore-waterrig intoa
soil to thewhere
settlement ofprescribed
triangular grid
the surface the1itto
of ground
2
enhanced
depth.
metre spacing.
evaporates or flows away.
T
he
re
su
lt
is
an
ac
ce
ler
at
ed
co
ns
oli
da
tio
n
of
th
e
gr
ou
nd
.
In eithermay
PVD case,be
theinstalled
drain is
HOW IS PVD
enclosed in a tubular steel
employing either
mandrel of small cross-sectional
vibratory
area usually 2orx 5static crowd
INSTALLED
methods.
125mm).
inches(50 x
A
sm
all
ste
el
an
ch
or
pla
te
is
att
ac
he
d
to
the
dr
ain
at
the
bo
tto
m
of
the
ma
nd
rel
.
Themandrel
The
When anchor plate
is then
the design
driven in to the soil
retains
depth
either withthe drainthe
is reached,
a static
mandrel
crowd is extracted.
in theorsoil.
vibratory rig
Wh
en
the
ma
ndr
el
is
full
y
ext
ract
ed,
the
dra
in
is
cut
off,
a
ne
w
anc
hor
plat
e is
inst
alle
d
and
the
pro
ces
s
beg
ins
aga
in.
THE PROCEDURE OF INSTALLATION
CONCLUSION
To decrease the overall time required for
completion of primary consolidation due to
preloading