Abstract
Abstract Vibroflotation is an effective method to improve the bearing capacity and liquefaction resistance of filling calcareous sand foundation. In this paper, an in situ experiment was conducted to study the vibration attenuation in three different directions. Six vibro-compaction positions were carried out in succession with 16 velocity transducers embedded in 3 directions in a plane. The rule of velocity attenuation can be explained by power function, which is consistent with previous studies. It can be found that a significant decrease of the velocity can be observed near the vibration source. However, the velocity can still spread to a long distance. This study compared the geometric and material damping coefficients of the vibration transmission in the calcareous sand. Additionally, vibroflotation can largely raise the dense degree of calcareous sand foundation, as evidenced by the gradually slow tendency of velocity attenuation. The vibrator is under a fixed frequency of 25 Hz, which is reflected by frequency-amplitude graphs. This study extends the investigation of wave propagation in strengthening calcareous sand foundation.
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