Compaction of sandy founda tion for the Kanev hydroelectric station by the C-629 hydrovibrator

Conclusions

• 1. The C-629 hydrovibration installation achieves additional compaction of structurally stronger in situ sands and those with a distubbed structure, up to a maximumattainable under the industrlat conditions (bulk weight of the skeleton, λ-1.65–1.76 g/cm³; relative density D=0.6–0.8). Compaction is atchieved in 1–2 lowerings of the hydrovibrator.

• 2. A significant effect is achieved in compaction down to 5 m. Ground compaction to greater dephths (to 10 m) tumed out to be difficult under the industrial conditions. With the tooldonger than 5 m, a slight slant of the vibrator in the movable clastic sleeve leads to a wedging-in of the hydrovibrator, to an excessive load on the electricmotor, and to frequent stoppage.

• 3. Deep hydrovibration compaction in the presence of a high water table is three times faster than the other mechanical operations

• 4. Deep compaction of sandy ground with the hydrovibrator is recommended for an extensive use in construction practice. Further improvements are necessary in the technique of compaction and in the hydrovibrator installation design.