Soil Vibro Stabilising (SVS) Method

Improvement Principle Compaction
It is a method to compact the entire ground by generating vibration when vibro-hammer and drilling rod that attached with vibro-flot at the tip-point being repeatedly driven & withdrawal in the ground while sand materials are filling to the surface of the loose sandy ground to enhance the shear resistance so as to prevent liquefaction.
Advantages Able to use locally supplied materials. Able to use soil generated from site as supplied materials.
Economical as compared to Land SCP because of high construction capacity.
Effective in prevention of liquefaction.
Disadvantages The effect of vibration & noise is big.
If cohesive soil layer exists in improved ground, there is possibility that it could obstruct the supply of material into the bottom layer.
Material supply volume is managed in each pile. It can not be managed by one meter unit such as SCP.
Applicable Ground Loose Sandy Soil
Objectives Prevent liquefaction at rear side of shore protection & wharf etc
Improvement Effectiveness Sandy Soil Prevent Liquefaction
Reduce Settlement
Increase Shear Strength
Cohesive Soil Not Applicable
Specification Standard Pile Diameter φ600mm (Conversion Dia)
Pile Arrangement
Square; Equilateral Triangle; Parallelogram; Rectangular.
Pile Spacing 1.2m ~ 2.4m
Improvement Rate 5% ~ 20 %
Penetration Depth Max GL -25m
Penetration Strength Max N-value < 20
Material Sand, Crushed Stone, Slug, Recycle Material, Existing Earth etc.,
Environment Vibration Big
Noise Big
Ground Displacement Relatively small but need attention