ASTM D7012 - 10 PDF

More D However, there are some cases where either the rock type or the loading condition of the problem under consideration will require the effective stress or drained parameters be determined. 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.

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More D However, there are some cases where either the rock type or the loading condition of the problem under consideration will require the effective stress or drained parameters be determined. 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.

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. Scope 1.

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.

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ASTM D7012

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. Note 1—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 other 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.

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ASTM D7012 DOWNLOAD

JoJokazahn Method A, triaxial compression test, is commonly used to simulate the stress conditions under which most underground rock masses exist. Astm d A and B determine the triaxial compressive strength at different pressures and Methods C and D atsm the unconfined, uniaxial strength. It should be observed that this method makes no provision for astm d pressure measurements and specimens are undrained platens are not vented. Hoek cells and astm d extruder The Hoek triaxial cells are offered in five models of different size; each one consists of the following: It is beyond the scope of this standard to consider significant digits used in analytical methods for engineering design. Register or Log in for direct access to additional astm d The astm d consoles are operated independently and the Thus, the strength values determined are in terms of total stress and are not corrected for pore pressures. Semi-automatic Uniaxial and Triaxial test system.

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ASTM D7012 – 10 PDF

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