Do I need geotechnical testing?
Geotechnical testing is required for projects which involve either excavation, dewatering, soil slopes and batters, foundations and/or retaining walls. Geotechnical testing involves conducting borehole sampling, classifying the sample, and testing the chemical, physical and mechanical properties of the soil. The number of boreholes required depends on the size and complexity of the project. High rise buildings typical conduct four to eight rock boreholes. Larger developments such as hotels and infrastructure projects will follow a grid pattern. For land contamination testing the required number of boreholes is detailed in the NEPM.
Types of geotechnical tests
The exact soil testing required depends on the proposed development and the site conditions and should be determined by an experienced professional. Common tests include:
- Soil moisture content testing (AS1289.2)
- Soil classification testing (AS1289.3)
- Soil chemical testing (AS1289.4)
- Soil compaction and density testing (AS1289.5)
- Soil strength and plasticity testing (AS1289.6)
- Soil reactivity testing (AS1289.7)
- Soil contamination testing (NEPM)
- Acid Sulfate Soils (SPOCAS and Chromium Reducible Sulfur)
- Salinity assessments
For information on soil permeability (conductivity) testing click here
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