Mathematical Correlations Between The Effective Diameter Of Soil And Other Properties


The equivalent or the “effective” diameter or size is a well-known parameter in soilclassification and permeability determination. Hazen (1892) on the basis of his study offilter sands found that the diameter that which 10% by weight of soil grains are finer maycause same effects as the given soil. Denoted as D10, Hazen called this diameter the“effective diameter”.The goal of this study is to determine the value of the percent finer that correspondsto the equivalent diameter of soil grains that may be used directly to calculate as accurate aspossible the surface area of the soil solids. The equivalent or the effective diameter wouldcertainly vary according to the gradation of the soil grains, the wider the range of particlediameters included in the soil matrix the smaller would be the effective diameter.It was concluded that the effective particle diameter of a soil can be related to othersoil properties such as the liquid limit, plasticity index, the unconfined compressive strengthand the standard penetration test number of blows (N).