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ASTM D7012 PDF

ASTM D Standard Test Methods for Compressive Strength and Elastic Moduli of Intact Rock Core Specimens under Varying States of Stress and. ASTM D Method C. Reference. Uniaxial Compressive Strength of Intact Rock Core Specimens. (deg). Type. Failure Mode. Rock Type. Buy ASTM D TEST METHOD FOR COMPRESSIVE STRENGTH AND ELASTIC MODULI OF INTACT ROCK CORE SPECIMENS UNDER VARYING.

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Historical Version s – view previous versions of standard. However, there are some cases where either the rock type or the loading condition of satm problem under consideration will require the effective stress or drained parameters be determined.

ASTM D, Test equipment Controls

Deformation and strength of rock are known to be functions of confining pressure. Method A, triaxial compression test, is commonly used to simulate the stress conditions under which most underground rock masses exist.

The elastic constants Methods B and D are used to calculate the stress and deformation in rock structures. Therefore, laboratory values for intact specimens must be employed with proper judgment in engineering applications. The quality of the result produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used.

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Agencies that meet the criteria of Practice D are generally considered capable of competent and objective testing. Users of this standard are cautioned that compliance with Practice D does not in itself ensure reliable results. Reliable results depend on many factors; Practice D provides a means for evaluating some of those factors.

Methods A and B determine the triaxial compressive strength at different pressures and Methods C and D determine the unconfined, uniaxial strength. These methods make no provision for pore pressure measurements and specimens are undrained platens are not vented. Thus, the strength values determined are in terms of total stress and are not corrected for pore pressures.

These test methods do not include the procedures necessary to obtain a stress-strain curve beyond the ultimate strength. The original four standards are now referred to as Methods in this standard. Strain is not typically measured; therefore a stress-strain curve is not produced.

ASTM D7012 – 14e1

Temperature Variation— Asfm to any of the methods and allows for testing at temperatures above or below room temperature. It is desirable to conduct tests in the plane of foliation, cleavage or bedding and at right angles to it to determine the degree of anisotropy.

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Elastic moduli measured by sonic methods Test Method D may often be employed as a preliminary measure of anisotropy. The elastic moduli for such rocks should be determined from unload-reload cycles that are not covered by these test methods.

No astmm units of measurement are included in this standard. In addition, they are representative of the significant digits that generally should be retained. It is beyond the scope of this standard to consider significant digits used in analytical methods for engineering design.

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Link to Active This link will always route to the current Active version of the standard.