سال انتشار: ۱۳۹۱

محل انتشار: دهمین همایش بین المللی سواحل، بنادر و سازه های دریایی

تعداد صفحات: ۸

نویسنده(ها):

Ali Reza Majidi – Technical Commitee Member – Ph.D – Mahab Ghodss Consulting engineering Co

چکیده:

It was often noticed by engineers that a significant but unintentional improvement in the soil was obtained in loose cohesionless layers, when driving or vibrating casings during theconstruction of pile foundation. Consequently, compaction using vibratory probes with vibratory needles was introduced at first in Germany in the early 1930’s [1].With this deep compaction technique, one can reach very high and uniform relative densities (Dr > 80%),unlike with the dynamic compaction or explosive technique. In marine projects which need to soil improvement of reclaimed land or for increasing the bearing capacity of gravity structure foundations such as blocky or caissons quay walls, in many cases, this compaction techniqueis the optimum or probably the exclusive practical method. In Fig. 1, improvement of the loose cohesionless layer under seabed by vibroflotation and from a shipboard is shown