Vibratory techniques to improve soils at depth has been practiced for more than 80 years. Initially developed in Europe, vibro technology is now used worldwide for a range of ground improvement applications.
Vibro Compaction is effective in improving the relative density of granular soils with certain gradations and limited fines content (typically less than 10%). The vibrator penetrates to design depth, aided by water or air flushing, and is then raised and lowered in discrete increments until the desired degree of compaction has been achieved. During the process, sand and gravel particles are rearranged into a denser configuration and settlement of the compacted soil mass is achieved. If the objective is to maintain original site elevation, additional material may be introduced to compensate for site lowering.
Vibro Replacement Stone Columns
Vibro Replacement Stone Columns increase the range of soils treatable by deep vibratory methods to include cohesive, mixed, and layered soils that typically cannot be improved by vibration alone. Columns are constructed by the introduction of natural or recycled aggregate backfill to the tip of the vibrator, either from the surface (bottom feed method) or via an integrated hopper and tremie assembly (top feed method). The horizontal action of the vibrator displaces the stone laterally to form a dense element. As successive stone columns are formed, the soil between columns is densified, creating an integrated soil/stone matrix that increasing increases bearing capacity and reduces settlement, permitting shallow footing construction.
Vibro Compaction & Vibro Replacement Applications
- Bearing capacity improvement
- Settlement reduction settlement under static and dynamic loading
- Mitigation of differential settlement
- Mitigation of liquefaction potential
- Reduction of lateral spreading
- Soil permeability reduction
Advantages of Deep Vibro Systems
- Cost effective and fast alternate to piling
- Allows use of economical spread footings and slab-on-grade construction
- Fully instrumented on board data acquisition
- In situ ground improvement minimizes environmental impacts
- Minimal noise and vibration
- Parking structures
- Storage tanks
- MSE retaining walls
- Slope stabilization
- Liquefaction mitigation
Vibro Aggregate Piers
Vibro Aggregate Piers serve a similar ground improvement purpose to Vibro Replacement stone columns but are typically limited to depths of 5-30 ft. This technique offers fast, economical treatment for poorly placed fills and shallow, cohesive, mixed and layered soils.