The use of sand or gravel column which is generally called a stone column is an effective method in modifying soil in order to increasing the bearing capacity or decreasing soil settlement and reduction of soil liquefaction in the earthquake. In stone column construction, usually 15 to 35 percent of weak soil volume is replaced with stone column material. In most equations of stone columns design it is used of the unit cells concept to model granular columns and surrounding soft soil. Laboratory study was conducted to better understand the reinforcing impact of sand column in the fine soil on stress strain behavior and shear strength of soft soil. The laboratory experiment consisted of series of the triaxial tests with a diameter of 100 mm and height of 200 mm. to simulate the effect of soil reinforcing, sand column with diameter of 37.5 and 51 mm was introduced in the center of the soft soil. The results indicate that by using of sand column the shear strength of fine soil has increased substantially. The results also showed increasing the diameter and confining pressure increases the shear strength of the soft soil reinforced by sand column. Details of tests including testing methods and results of the experiments and description of diagrams are provided in the original paper.
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