Volume 2, Issue 2 (3-2008)
Abstract
(Paper pages 473-492) One of the main reasons of destructions while happening earthquake and applying intense force is the brittle deformation of outer crust of the earth. Creep in the coastal sediments may happen by the virtue of existing cracks and fissures, unnatural movement and/or loss of the earth tolerance. This phenomenon in sandy areas may happen by increasing the pressure of gang ionic water and is called liquefaction. Studying the laboratory sample shows that the capability of liquefaction of sandy deposits can be decrease by flattening the land. One of the ways to improve the soil to increase the tolerance while applying dynamic loads is dynamic compaction. The design and usage of dynamic compaction usually depend on experiment. Dynamic compaction is an active design which needs a revision and method reformation in progress according to the reaction of the earth against the hit. In 12 parts of ship manufacturing and repairing factories bed in the Iran ship building and offshore industries complex co. located in 40km away in the west of Bandar Abbas, Dynamic compaction has been used to prevent liquefaction phenomenon. While performing of water in pressing step are happened that the following approaches are suggested: 1- To empty the water of sinkholes by a pump, 2- To perform dynamic compaction in two steps with regarding the adequate time between the steps of applying hits. and 3-Sludge taking in the surrounding areas and using large grain mixture and finally if needed to do deep drainage in a large area.
