ASTM D7012 - 10 PDF

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.

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Historical Version s - view previous versions of standard. Work Item s - proposed revisions of this standard. 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. 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. 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. 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.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Scope 1. Link to Active This link will always route to the current Active version of the standard.

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ASTM D7012

Historical Version s - view previous versions of standard. Work Item s - proposed revisions of this standard. 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.

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Semi-automatic Uniaxial and Triaxial test system. Basic test apparatus

Active view current version of standard. Other Historical Standards. Work Item s - proposed revisions of this standard. More D The tests provide data in determining the strength of rock, namely: the uniaxial strength, shear strengths at different pressures and different elevated temperatures, angle of internal friction, angle of shearing resistance , and cohesion intercept. It should be observed that 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, that is, are not corrected for pore pressures.

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ASTM D7012 - 14e1

Active view current version of standard. Other Historical Standards. Work Item s - proposed revisions of this standard. More D

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