According to the Burmister classification system, soil is classified based on its grain size distribution for granular soil and plasticity index for cohesive soil. Figure-1 showed the results of the Atterberg limits test from the laboratory. The plasticity index of the soil was calculated using the liquid limit and plastic limit values.
Boring Location | Elevation | Liquid Limit % | Plastic Limit % | Plasticity Index |
#1 | 0′-6′ | 61.8 | 22.67 | 39 |
6′ – 8′ | 81.7 | 29.81 | 52 | |
#2 | 0′-6′ | 54.8 | 23.14 | 32 |
6′-8′ | 45.2 | 18.4 | 27 |
Based on the plasticity index from Figure-1, the cohesive soil was classified as Black Silty CLAY and the granular soil was classified as Yellow SAND trace Gravel.