Evaluating soil strength beneath manholes for reliable structural support
Dynamic Cone Penetrometer (DCP) testing is a geotechnical method used to assess the bearing capacity and density of soil layers beneath manhole foundations. This testing is essential for confirming ground stability before concrete bases are poured, ensuring long-term durability and compliance with Sydney Water, Section 73, and council regulations.
The test involves driving a cone into the soil using repeated hammer blows and recording the depth of penetration after each blow. The rate of penetration (measured in mm/blow) provides insight into the soil’s density and compaction properties at various depths. It helps identify weak or loose layers that may need remediation prior to construction.
DCP testing is conducted in situ below each manhole location, and all findings are documented in NATA-certified reports to verify that technical standards have been met.
Key Benefits
- Assesses soil strength and compaction under manhole foundations
- Identifies unstable layers that could compromise structural integrity
- Supports compliance with Sydney Water, Section 73, and council standards
- Provides reliable data for site preparation and foundation approval
- Delivers NATA-certified verification of soil and foundation stability [Click here to view our certification.]
Where DCP Testing Applies
- Manhole installations and upgrades
- New infrastructure development
- Sites requiring soil verification before pouring concrete bases
- Projects where long-term structural support is critical
