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Lab Services: Rock testing

Lab Services: Rock testing

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Test Method Title

Standard Test Method for Triaxial Compressive Strength of Undrained Rock Core Specimens Without Pore Pressure Measurements **ASTM has discontinued this method, the industry-accepted standard test method is now ASTM D7012A

Reference Number

ASTM D2664



Test Property

Shear Strength, Young's Modulus, Cohesion intercept, Angle of Internal Friction

Description of Test

Rock is known to behave as a function of the confining pressure. The triaxial compression test is commonly used to simulate the stress conditions under which most underground rock masses exist. This test method covers the determination of the strength of cylindrical rock core specimens in an undrained state under triaxial compression loading. The test provides data useful in determining the strength and elastic properties of rock, namely: Shear strength at various lateral pressures, angle of internal friction, cohesion intercept, and Youngs modulus. It should be observed that this method makes no provision for pore pressure measurements. Thus the strength values determined are in total stress, that is, not corrected for pore pressures.

Preferred Test Sample Size

Number of Test Specimens

1 or more

Test Specimen Size

Right circular cylinder, with diameter of at least 1 7/8 in and a length to diameter ratio of 2 to 2.5


Rock, Rock Strength, Rock Triaxial

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