vibrokompaktering

Vibrokompaktering, or vibro compaction, is a ground improvement technique used to densify granular soils by applying controlled vertical vibrations through a vibro probe lowered into the ground. The vibrations rearrange soil grains into a closer packing and expel pore water, increasing dry density and stiffness. As a result, bearing capacity is improved and settlement potential is reduced, making it suitable for foundations, embankments, and other structures built on weak soils.

The method uses a vibro hammer or vibrating probe mounted on a crane or drilling rig. The probe is advanced into the soil to the desired depth while producing low-frequency vibrations. A downward load helps to compact and stabilize the probe, and sequences of insertion and withdrawal create compacted zones. In some installations jets of water or air assist penetration and soil movement. A related practice, vibro replacement or vibro stone columns, uses the same equipment to form cavities that are filled with granular material, creating load-bearing columns.

Suitability and limitations: Vibrokompaktering is effective in loose to medium-dense granular soils with limited fines. It is less effective for cohesive soils such as clays and silty clays, where alternative or complementary methods may be required. Considerations include groundwater conditions, proximity to existing structures and utilities, and site access. The technique can reduce settlements and increase bearing capacity, but it involves noise and vibration that must be managed through proper planning and monitoring.