Dynamic probing involves driving a steel cone vertically into the ground using a sliding hammer and recording the number of blows for each 100mm of penetration. The results obtained from the dynamic probe tests can be correlated to the standard penetration test (SPT).

How does a DCP test work?

Conducting a DCP test involves raising and dropping the hammer to drive the cone on the lower shaft through the underlying pavement layers. Typically, after each hammer blow, the penetration of the cone is measured and recorded. In stiffer soils, readings may be recorded after several hammer blows.

What is DPSH?

DPSH stands for dynamic probe super heavy, which is a specific type of dynamic probe test that uses a hammer with the same weight and drop height as the Standard Penetration Test (SPT) and the same size diameter cone (50 mm). In effect, this test is like a continuous SPT test.

What is the weight on the DCP?

The test is performed by driving a metal cone into the ground by repeated striking it with a 17.6 lb (8 Kg)weight dropped from a distance of 2.26 feet (575 mm).

What is Window sampling?

Window sampling or windowless sampling is a technique used to bore through shallow soft soils to investigate the substrata in order to gain a profile of the ground conditions and to facilitate soil sampling for chemical and geotechnical analysis.

What is DCP test?

DCP & CBR Testing DCP testing is used to determine the strength of the subsurface and design load of the soil. The engineers perform the testing in-situ to give an estimation of the load bearing capacity which a soil can withstand, by measuring the extent of penetration into the ground of a calibrated tip or cone.

What size rod do you use for dynamic probing?

Typically, our Dynamic Probing Site Investigations follow on from Window Sampling Boreholes and use 35mm diameter rods with a 20cm 2 area cone (50mm diameter and 90 degrees). The cone is driven into the ground with a 63.5kg rammer, dropped through 750mm. The penetration rate is determined by the number of blows over a distance of 100mm

What is dynamic probing and how does it work?

Dynamic probing involves driving a steel cone vertically into the ground using a sliding hammer and recording the number of blows for each 100mm of penetration. The results obtained from the dynamic probe tests can be correlated to the standard penetration test (SPT). The cone diameter and angle will depend on the chosen method.

How do you do a dynamic probe?

Dynamic probing Dynamic probing involves driving a steel cone vertically into the ground using a sliding hammer and recording the number of blows for each 100mm of penetration. The results obtained from the dynamic probe tests can be correlated to the standard penetration test (SPT). The cone diameter and angle will depend on the chosen method.

What is the cone diameter and angle of a dynamic probe?

The results obtained from the dynamic probe tests can be correlated to the standard penetration test (SPT). The cone diameter and angle will depend on the chosen method. For example, the super heavy dynamic probe (DPSH) has a cone diameter of approximately 50mm and a cone angle of 90 degrees.