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Abstract
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Gravel compaction piers are used as an option for the improvement of loose soils to reduce settlement, increasing load capacity and soil resisting against liquefaction. These piers are similar to other stone column elements, have radial soil drainage performance at the time of the earthquake, and the rapid cessation of excessive pore water pressure. In addition, due to the way the piers are implemented, the soil around the piers is well compressed during execution. In practice, the two drainage properties of the piers and the density of the soil around the piers lead to the resistant to liquefaction of the soil. In most cases, the increase in soil compaction in the piers is so high that it alone makes the soil more resistant to liquefaction. This paper, based on the condensation properties of the piers, provides a simple solution for selecting the optimal diameter and the distance between the piers with a triangular arrangement to resisting against liquefaction and predict the main parameters of soil. Also, the effect of the characteristics of the compaction piers, including the diameter and distance between the piers, is evaluated in removing soil liquefaction. In this regard, using the aforementioned strategy, the compaction effects of gravel compaction piers construction on the amount of soil around the piers, the stresses created within the soil and the liquefaction condition with increasing diameter and piers spacing, based on geotechnical site information in Rig port of Bushehr province, an evaluation has been made. Based on the analysis, the results show that the gravel compaction piers with triangular arrangement merely lack the drainage properties of the piers can increase the soil dry unit weight by 12%, reduce the void ratio of the soil by 23%, and Satisfactory increase the soil security factor versus liquefaction.
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