A history of vibratory deep compaction 13
observed that the vibrator sank to a depth of 35 m, where it was obviously
stopped by the presence of a hard marl layer (Figure 2.7). It was not until
40 years later that modern depth vibrators achieved the same depth again
in conjunction with the compaction work carried out for the foundation of
the Jebba Dam in Nigeria (Solymar et al., 1984).
Figure 2.6 Early cone resistance measurement curves in sand fill, (a) uncompacted sand
fill, (b) sand fill after vibro compaction. Note: Verdichtungsnachprüfung mit
der Spitzendrucksonde—compaction verification with static cone penetrometer, unverdichtete Schüttung—uncompacted fill, verdichtete Schüttung—
compacted fill, Sandschüttung—sand fill, and Lauenburger Ton—hard clay.
(Courtesy of Degebo, Berlin, Germany.)
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