Lateral Bearing Capacity of Piles in Cohesive Soils Based on Mohr-Coulomb Yield Criterion

Abstract:  Today,  natural colorants are emerging globally due to the fact that are safer and environmentally-friendly.  Natural dyes have been employed in dyeing  Persian carpet piles for many years.  In  this  study,  the dried  Achillea  was  used  for  dyeing wool yarns. The Iranian wool yarn was scoured, mordanted using some metal salts including Cu, Sn, Al and then dyed with different amounts of dried Achillea powder. Taguchi statistical method was employed to find the effective factors and results of the  planned  experiments,  in  order  to  optimize  the  dyeing  factors.  A  L9 orthogonal array (four factors in three levels) was employed to evaluate the effects of different parameters  in  dyeing  process.  The  colorimetric  properties  of  the  dyed  yarns  were evaluated in CIELAB system. Achillea found to have good agronomic potential as a natural  dye  in  Iran.  Metal  mordants when  used  in  conjunction  with  Achillea  were found  to  enhance  the  dyeability  and  its  fastness  properties.  Therefore  this  natural dye has good scope in the commercial dyeing of wool yarns used as Persian carpet piles.

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