INFLUENCE OF SALT DISSOLUTION RATE ON THE HYDRAULIC CONDUCTIVITY OF SABKHA AND DUNE SAND ARID SOIL DEPOSIT SAMPLES FROM KUWAIT
Keywords:Dissolution, Dune, Hydraulic conductivity , Sabkha , TDS.
The geotechnical characteristics of salt-cemented arid soils may be affected by flooding. Due to the loss in cementing salt bonds caused by a continuous water flow, the salts and fines may be washed out, and the geotechnical properties may deteriorate. Therefore, investigating the relationship between hydraulic conductivity and salt dissolution is of primary importance. In this study, the variation in hydraulic conductivity with salt dissolution was investigated. The samples of two primary soil surface deposits in Kuwait—sabkha and dune sand soil samples—were permeated with distilled water in a leaching cell under 3-psi pressure for more than 50 pore volumes. The hydraulic conductivity and total dissolved solids were measured at intervals of 5 pore volumes. The test results showed a 250% increase in the hydraulic conductivity of the sabkha soil compared with its initial value due to salt dissolution. An increase of 110% was observed in the hydraulic conductivity of the dune sand. Increasing the hydraulic conductivity values correlates well with the soil samples’ salt dissolution rates (TDS), which were higher for the sabkha soil in the first pore volumes. A deep
understanding of the salt dissolution behavior of sabkha soils will help select their suitable stabilization