Page 138 - Handbook GEOTEKNIK_Final_Neat

Ground Improvement Method Ground Improvement Method

Stone Column / Vibro Replacement Vibro Compaction

Stone Column / Vibro Replacement
(i) Densifies non cohesive soil by aid of vibration and improves the ground.
Usually Two methods (ii) Improves non compactible cohesive soil by installation of load bearing column of well
Diameter: 0.8 – 1m compacted, coarse grained backfill material.
Depth: 6 - 20m
Spacing: 1.5-2.5m c/c

Material : rock / stone size up to 12’
Design: stability, settlement, gain strength
Parameters : loading, column radius & spacing, replacement
area, C , C , T , e C , , , P , C , M
v
c
c
u
v
r
v
o ,
Require : 90% settement on completion of construction
Total residual settlement < 250mm for 5 years
post construction

water is used to flush mandrel is jacked into
out soils and stones the ground and stones
fed into the hole fed through mandrel Penetration Compaction Backfilling
Completed Column

122 PUBLIC WORKS DEPARTMENT MALAYSIA GEOTECHNICAL ENGINEERING HANDBOOK 123