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HomeMiningMetallurgy & Process DesignUnit Operations & MetallurgyComminution & BeneficiationTriaxial & Uniaxial Tests
ASTM test method D 2850 determines unconsolidated undrained compressive strength of cohesive soils in triaxial compression. This test is also referred to as a quick triaxial test.
Soil samples in an undrained (wet) condition are placed under compression, but with a selected confining pressure surrounding the sample. The test is usually run three times at three different confining pressures. Water is not allowed to drain from the sample during compression.
This test is typically run on soil samples that are expected to be at or near complete saturation when loaded, and expected to undergo rapid loading such that there is insufficient time for drainage and consolidation of the soil to occur.
The unconsolidated, undrained compressive strength of the soil is the maximum deviator stress obtained during the test under the selected confining pressure. This test method is also useful for determining total stress (undrained) strength properties such as apparent cohesion and the stress/strain relationship of the soil.
The shear strength determined from the test expressed in terms of total stresses (undrained conditions) or effective stresses (drained conditions) is commonly used in embankment stability analyses, earth pressure calculations, and foundation design.
Unconfined (Uniaxial) Compression Test (UCS)
The test determines the unconfined compressive strength of a rock specimen. Drill core specimens with length to diameter ratio greater than 2:1 are cut with a diamond saw to achieve nearly parallel end faces within ± 0.025 mm.
The cylinder is then submitted to UCS measurements within an electronic-servo controlled Material Test System (MTS) at loading rates of approximating 10-5 s-1, until failure of the specimen. The loading data and other test parameters are recorded with a computer-based data acquisition system, and the UCS is reported.
Axial force, axial deformation and circumferential deformation variables can also be recorded as part of the procedure to generate the Young’s Modulus and Poisson’s ratio.
SGS's team of experienced engineers will conduct the Triaxial and Uniaxial tests in combination with other bench-scale tests. Contact us today for bankable solutions to reduce your risk.
In the US, the SGS Beckley, WV laboratory provides rock mechanics testing on core samples for coal and mineral mining. Our staff are specialists in performing these vital tests and are highly regarded by the US coal mining community. Combined with other testing capabilities, which include float-sink analysis and full chemical and physical testing of the rock and coal core, we are able to provide you with a full characterization of your core samples. To find out how we can help you with your testing and sampling needs, contact us today.