Oedometers Research Papers - Academia.edu (original) (raw)
Loess as a type of collapsible soils is a well-studied Aeolian deposit, which is characterized by some specific engineering properties including high initial void ratio, relatively low initial density, low water content, and a high... more
Loess as a type of collapsible soils is a well-studied Aeolian deposit, which is characterized by some specific engineering properties including high initial void ratio, relatively low initial density, low water content, and a high percentage of fine-grained particles. Collapsible soils such as loess, sustain substantial stress under dry condition. However, they experience a high and sudden decrease in their volume by reaching to their critical moisture content. As a result, their natural condition is not suitable for construction works if the possibility of the exposure of the soil to excessive water is present.
This research presents the utilization of an innovative method for stabilization and improvement of Gorgan loessial soil. This method uses Electrokinetics and Nanomaterials as an in-situ remedial measure to instigate additives to move through soil pores through ion migration phenomena. In order to assess the deformation and strength behavior of improved collapsible soil and comparing with those of unimproved soil, several Unsaturated Oedometer tests under constant vertical stress and varying matric suction were performed.
The result showed the effect of matric suction on the behavior of both improved and unimproved samples. The resistant of the soil was highly dependent on the water content and matric suction. The Oedometer tests on samples improved by 3% Lime and 5% nanomaterials showed considerable improvement of Collapse potential. Results also showed that stabilized samples experienced notably lower volume decrease under the same induced stresses.
Results from 300 one-dimensional compression tests performed up to high values of vertical stress are presented in the paper. Compression index and apparent preconsolidation stress values from these tests were recalculated as if the... more
Results from 300 one-dimensional compression tests performed up to high values of vertical stress are presented in the paper. Compression index and apparent preconsolidation stress values from these tests were recalculated as if the maximum value of vertical stress was 1000 kPa and they were compared to the originally calculated values. The comparison reveals that when the maximum vertical stress reaches only relatively low values as those often encountered in tests performed in practice, the compression index is usually underestimated, and the apparent preconsolidation pressure systematically underestimated.