Cone Penetration Testing

Sampling

Utilising traditional CPT apparatus with special tools, undisturbed samples can be recovered up to 66mm in diameter. The tools are pushed-in to allow the sampling tool to be deployed in catching samples up to 1.2m in length at pre-determined depths. Captured samples are contained in a plastic sheath, capped at both ends, for storage. Samples can be taken in both coarse-grained and fine-grained materials provided the soil is penetrable and are suitable for further geotechnical testing including, visual / manual description and other classification testing, Atterberg limits, triaxial / uniaxial tests and oedometer tests.

Stopping the probe as this point and measuring the rate over time that this pressure dissipates to the equilibrium pressure is called a dissipation test. The results of this test are a powerful field test in respect of permeability and thus consolidation properties of the soil in addition to establishing equilibrium water pressure profiles. The test is a semi-direct measurement of the horizontal coefficient of consolidation and would inform settlement and seepage analyses more directly than empirical correlations. Dissipation testing can also be undertaken using the dilatometer apparatus.

Cone Penetration Testing

Sampling

Cone Penetration Testing

Sampling

Utilising traditional CPT apparatus with special tools, undisturbed samples can be recovered up to 66mm in diameter. The tools are pushed-in to allow the sampling tool to be deployed in catching samples up to 1.2m in length at pre-determined depths. Captured samples are contained in a plastic sheath, capped at both ends, for storage. Samples can be taken in both coarse-grained and fine-grained materials provided the soil is penetrable and are suitable for further geotechnical testing including, visual / manual description and other classification testing, Atterberg limits, triaxial / uniaxial tests and oedometer tests.