Earthwork Supervision

Earthwork Specifications for Land Development & Water Retention (for Dams, Landfill & Wetlands)

SITE Geotechnical can provide guidance on the specification, execution, and control testing of earthworks and associated site preparation works for investigations, recommendations, construction considerations, and material assessment for many types of works requiring earthworks associated with pavements, water retention structures, land fill sites, and land development.

We offer the earthwork supervision that is required for controlled fills; overseeing topsoil removal, fill placement and compacting, trenching, backfill, proof rolling or test rolling, and testing. Our ensuing reports will include details of the work and inspections carried out within site visit records and results from testing carried out.

The easy-to-follow format of our reports and site visit records lays out all the specifics of the samples taken, inspections made, and the location and result of each test carried out in the course of the earthworks.


Density Ratio, Relative Compaction

The degree of compaction specified and achieved in cohesive soils is usually expressed as a density ratio, as described in AS 1289.5.4.1. This compares the density of the compacted soil with a reference density, being the peak density, which can be achieved in a controlled laboratory compaction process, e.g. Standard Compaction, AS 1289.5.1.1.  Density Ratio is also sometimes referred to as Relative Compaction. This more generic term allows for other reference testing procedures such as Hilf Rapid Compaction (AS 1289.5.7.1) for clay fills.


Field Density Testing

To allow comparison of the achieved field compaction with a laboratory reference density, it is necessary to be able to reliably determine the achieved field density and moisture content. The commonly used methods for assessing field bulk density is the nuclear density gauge (AS 1289.5.8.1), but moisture content usually is measured in the laboratory. Indirect measures of achieved compaction include penetrometer testing and test rolling using a water cart. The Perth Sand Penetrometer (PSP) is often used in clean sands, with the number of blows required to drive a blunt ended rod into the sand taken as an indicator of the relative compaction of the sands. The Dynamic Cone Penetrometer (DCP) provides a similar correlation for all soil types.  In some circumstances visual appraisal (including test rolling, if appropriate), may override test results for relative compaction.


When carrying out earthwork supervision, the SITE Geotechnical team will perform and record the necessary testing for your project. Whether for a civil engineering or road construction project, building, infrastructure, or land development, our team can provide the thorough geotechnical investigations and detailed reports that you require.

Based in South East Victoria, we have been assisting with civil engineering and building projects throughout the state since 2005. Our team will also be available, should you need landslide investigations, distressed structure investigations, land capability assessments (LCAs), or soil investigation for greenfield sites. 


density meter

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