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Lab Services: Soil testing

Lab Services: Soil testing

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Test Method Title

Standard Test Method for Unconsolidated-Undrained Triaxial Compression Test on Cohesive Soils

Reference Number

ASTM D2850



Test Property

Undrained Strength

Description of Test

This test method covers determination of the strength and stress-strain relationships of a cylindrical specimen of either undisturbed or remolded cohesive soil. Specimens are subjected to a confining fluid pressure in a triaxial chamber. No drainage of the specimen is permitted during the test. The specimen is sheared in compression without drainage at a constant rate of axial deformation (strain controlled). This test method provides data for determining undrained strength properties and stress-strain relations for soils. This test method provides for the measurement of the total stresses applied to the specimen, that is, the stresses are not corrected for pore-water pressures.

Preferred Test Sample Size

Number of Test Specimens


Test Specimen Size

Minimum of 1.3 in diameter, with a height-to-average diameter of 2-2.5, with minimum particle size 1/6 the diameter. Can perform on up to 6" diameter x 12" high specimens


Cohesive soil, lateral confinement, strain-controlled loading, stress-strain relationships, total stresses, unconsolidated undrained strength, UU, triaxial, shear

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