Site classification
Soils are classified according to their stability. Soil samples are taken on the site to determine soil class. A geotechnical engineer's report will clearly state the likely soil conditions and recommend a suitable footing system.
Type of soil | Description | Class |
---|---|---|
Rock | Rock sites have no ground movement | A |
Sand | Sand has little or no movement | A |
Clay, slightly reactive | Slight ground movements due to moisture changes | S |
Clay, moderately reactive | Moderate ground movements due to moisture changes | M |
Clay, highly reactive | High ground movements due to moisture changes | H |
Clay, extremely reactive | Extreme ground movements due to moisture changes | E |
Problem | Sites which include soft soils, loose sands, landslip, mine subsidence, collapsing soils, erosion, fill and abnormal moisture conditions | P |
Table 1: Site classification