Effect of Compaction Ratio, Frequency, Stress Amplitude and Cyclic Stress Ratio on the Dynamic Characteristic of Sea Sand Material under Vehicle Loading

Abstract

Haiphong city is situated on the North-Eastern coast of Vietnam. This city has a large coastal and sea area, which is an advantage for marine economic development. However, in order to reclamation the coastal area, river sand material is much demand which leads to face some environmental problems due to the exploitation of river sand. Thus, the intensive laboratory experiments were conducted including physical, chemical and mechanical tests of river sand and sea sand to evaluate the potential use of sea sand in road embankment in Haiphong city. The samples were prepared by compacting to value of 90% and 95% of maximum density defined by the Standard Proctor test. Consolidated undrained cyclic triaxial tests were conducted for sea sand samples and river sand samples. The cyclic triaxial test results showed that all samples are not liquefied under normal vehicle conditions which corresponding to cyclic deviator stress about 8 kPa and frequency of 1 Hz. In addition, sea sand samples were not liquefied when increasing the compaction effort to 95% of maximum density. Therefore, it is possible to use sea sand instead of river sand in some cases for reclamation land in the Haiphong area.