Establish critical site information such as granular soil bearing capacity, relative density and settlement with a Standard Penetration Test.

What is an SPT?

Standard Penetration Test (SPT) is a straightforward and cost-effective testing procedure commonly used in geotechnical investigation. The test was developed to help establish geotechnical engineering properties of subsurface soils. Among other quantifications, the SPT can help determine the relative density and angle of shearing resistance of unconsolidated soils as well as the durability of stiff cohesive soils.

SPT Advantages



Compared to other testing methods, the SPT is extremely economical to execute, offering data that discerns compressibility and relative strength index of soils at low cost.



The testing procedure can be executed very quickly and is relatively straightforward to perform.



The SPT may be conducted for a large range of soil conditions and is able to penetrate dense layers, gravel and silt.

How Do I Know I Need an SPT?

Measure soil properties
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If you need to inspect soil parameters or properties on site, you will likely require an SPT. The SPT will allow you to determine the density, angle of shearing resistance and bearing capacity of any soil, as well as the unconfined compressive strength of cohesive soils.

Keep operational costs low
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The SPT’s simplicity makes it the most economical method of determining penetration resistance of soil at varying depths.

Cohesionless soil on site
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If your area contains cohesionless soils, an SPT is the best method to determine its angle of shearing resistance and relative density.

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