| Soil classification | Description of soil | Nspt Number of blow/30 cm | Cu (KN/m2) | Vs (m/s) |
| A | Rock or rock fragments resembling contain a week surface layer have a thickness of at most 5 m. | - | - | More than 800 |
| B | Deposits extends for tens of meters thick composed of (sand + gravel) dense or clay with heavy resistance cohesion Cu shown in the table, with the increasing values of mechanical properties gradually with depth. | More than 50 | More than 250 | 360 - 800 |
| C | Deep soil deposits of non-cohesive (sand + gravel) medium to heavy or clay with resistance cohesion Cu shown in the table, thickness ranges from tens to hundreds of meters. | 15 - 50 | 70 - 250 | 180 - 360 |
| D | Soil is non-cohesive (sand, gravel) loose to medium density (may be present by cohesive layers such clay, loam or the prevailing coherent soil with cohesion resistance Cu shown in the table. | Less than 15 | Less than 70 | Less than 180 |
| E | Soil section consists of the surface layer of river sediment Vs, such C or D with variable thickness from 5 - 20 m and the material underneath are strongest Vs more than 800 m/s | - | - | - |