Abstract:

Based on the test results of a large number of samples and field tests in the Mekong Delta coastal provinces, the statistics and analysis about geotechnical properties of soft clayey soil of the middle - upper holocene, fluvio-marine deposits (amQ22-3) are made. In four areas of the Mekong Delta coastal provinces, amQ22-3deposits are large change of thickness from few meters to more than tens of meters. The dominant component of clay minerals in soft soil is illite or kaolinite due to the topography and natural conditions. Some characteristics which are disadvantage of stabilization of soil for road construction such us organic matter content is over 5%, the pH values is less than 4, the cation exchange capacity of soft soil is medium to high (from 16,9 to 25,86 me/100g of dry soil). These soils are generally associated with low dry unit weight, high moisture contents, high compressibility and low shear strength. They are disadvantage for construction of the road and soft ground treatment must be applied. The researching on the mechanical parameters may serve and improve the efficiency of ground improvement for road construction