GeoTesting Express is a provider of Rock Testing Services – ASTM D – Sliding Friction,(Rock Sliding Friction) Standard Test Method for Performing. GeoTesting Express is a provider of Rock Testing Services – ASTM D – Direct Shear,(Rock Direct Shear) Standard Test Method for Performing Laboratory. Lab ID: ASTM D Use. This test method establishes requirements and laboratory procedures for performing direct shear strength tests on rock specimens.
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Historical Version s – view previous versions of standard. Pervasive discontinuities joints, bedding planes, shear zones, fault zones, schistosity in a rock mass, and genesis, crystallography, texture, fabric, and other factors can cause the rock mass to behave as an anisotropic and heterogeneous discontinuum. Therefore, the precise prediction of rock mass behavior is difficult.
SET OF 4 DIAL GAUGES TO ASTM D | Matest
Sliding on and shearing of the asperities can occur simultaneously. When the normal force is not sufficient to restrain dilation, the shear mechanism consists of the overriding of the asperities. When the normal load is large enough to completely restrain dilation, the shear mechanism consists of the shearing off of the asperities. In situ direct shear testing limits the inherent scale effects found in rock mechanics problems where the laboratory scale may not be representative of the field scale.
Therefore, it may be necessary to handle specimens in accordance with Practice D and to document moisture conditions in some manner in the data collection.
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. Users of this standard are cautioned that compliance with Practice D does not in itself assure reliable results. Reliable results depend on many factors, Practice D provides a means of evaluating some of those factors.
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It includes procedures for both intact rock strength and sliding friction tests, which can be performed on specimens that are homogeneous, or have planes of weakness, including natural or artificial discontinuities. Examples of an artificial discontinuity include a rock-concrete interface or a lift line from a concrete pour. Discontinuities may be open, partially or completely healed or filled that is, clay fillings and gouge.
Only one discontinuity per specimen can be tested. The test is usually conducted in the undrained state with an applied constant normal load. However, a clean, open discontinuity may be qstm draining, and, therefore, a test on a clean, open discontinuity could be considered a drained test. During the test, shear strength is determined at aetm applied stresses normal to the sheared plane and at various shear displacements.
Relationships derived from the test data include shear strength versus normal stress and shear stress versus shear displacement shear stiffness.
The actual contact areas during testing change, but the actual total contact surface is unmeasurable. Therefore nominal area is used for loading purposes and calculations. Since this test method makes no provision for the measurement of pore pressures, the strength values determined are expressed in terms of total asgm, uncorrected for pore pressure.
The constant normal load boundary condition is appropriate for problems where the normal stress is constant along the discontinuity.
The constant normal load boundary condition may asgm be appropriate for problems where shearing is dilatancy controlled and the normal stress is not constant along the discontinuity.
In addition, they are representative of the significant digits that generally should be retained. It is beyond the scope of these test methods to consider significant digits used in analysis methods for engineering design.
The values given in parentheses are mathematical conversions to inch-pound units, which are provided for information only and are not considered standard. Reporting of test results in units other than SI shall not be regarded as nonconformance with this test method. 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.
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