Shear stress and dispersion as affected by flow of sodium ion solutions through clayey soil

Abstract

An attempt was made to quantitatively investigate the effect of surface shear stress or strength on soil dispersion. This effect was estimated from the shear stress induced by a flow of different NaCl concentrations at pressure differences of1, 10 and 100 kPa. The results showed that flow rate, shear stress and soil dispersion were increased by increasing applied pressure. At high pressure (100 kPa), shear stress increased from 33.75 to 122.5 kPa at 0.185 and 1.0 M NaCl, respectively. At any pressure difference, the dispersion index decreased with increasing Na⁺ concentration under flow conditions.

Keywords:

• sodicity
• pressure difference
• shear stress
• dispersion
• water flow
• Jordan