Sina Keshtkar - Master of Civil Engineering in Water Branch

Leaching in soils is the important subject in the civil engineering inwater branch. Leaching resulted in removal salts of soils and resulted rkeducation strength and physical properties of soils. Lixiviation ofsoluble salts cause the change of physical properties as unit weight,void ratio, atterberg limit, hydraulic conductivity and specific gravity(Gs). In result of have become loose the soil structure, strengthparameters are reducted. One of the effects of reduction strength in soilsis instability slopes that finally cause sliding. In this study with carryout series of chemical, physical and strength tests effect of leachinghave been appointed and investigated on the north of Iran's clay soils.This study indicated that in result of leaching the soil structure havebeen porous and removal the soluble salts and part of the fine particlechange the dry unit weight, void ratio, Gs and hydraulic conductivity.Also leaching cause the reduction of mechanical properties content ofunconfined compressive strength, Elasticity of modulus, Cohesion andfriction angle in two condition as drained and undrained have beenchanged. Then with use as result of laboratory test and consideration acase study and with use of the software (Geo-slope) effect of leachingin sliding has been investigated.

Hydraulic Conductivity , Leaching , Unconfined Compressive Strength , Geo-slope , Modulus of Elasticity