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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The shear box consists of two halves, the upper being connected to two rams for reversible shearing action and the lower connected to a ram for normal load application. The constant normal load boundary condition may not be appropriate for problems where shearing is dilatancy controlled and the normal stress is not constant along the discontinuity.
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.
SET OF 4 DIAL GAUGES TO ASTM D | Matest
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. The test is usually conducted in the undrained state with an applied constant normal load.
During the atsm, shear strength is determined at various applied stresses normal to the sheared plane and at various shear displacements. The quality of the result produced by this standard r5607 dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. In addition, they are representative of the significant digits that generally should be retained. Therefore nominal area is used for loading purposes and calculations.
The test is usually conducted in the undrained state with an asm constant normal load. Relationships derived from the test data include shear strength versus normal stress and shear stress versus shear displacement shear stiffness.
The apparatus consists of a shear box designed to accept samples asgm larger than x mm, or alternatively cores up to mm dia. The normal loading d55607 is complete with an adjustable low friction pressure maintainer to absorb volume changes of the specimen during the shearing action and to ensure a constant vertical stress.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Order Form 2 Email complete form to contact listed below.
Print and complete the following order form. 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.
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Samples should be sealed in a plastic wrap inside their shipping container, protected against air, moisture, and direct sunlight. Relationships derived from the test data include shear strength versus normal stress and shear stress versus shear displacement shear stiffness.
Examples of an artificial discontinuity include a rock-concrete interface or a lift line from a concrete pour. The actual contact areas during testing dd5607, but the actual total contact surface is unmeasurable. When the normal force is not sufficient to restrain dilation, the shear mechanism consists of the overriding of the asperities.
It is a simple and practical method of determining the strength and slope stability of rock, both in the field and in the laboratory. Note 2—Since this test method makes no provision for the measurement of pore pressures, the strength values determined are expressed in terms of total stress, uncorrected for pore pressure. Please contact a CTLGroup chemical services representative or Project Manager to discuss your individual project needs and testing response times. The constant normal load boundary condition is appropriate for problems where the normal stress is constant along the discontinuity.
Link to Active This link will always route to the current Active version of the standard. Discontinuities may be open, partially or completely healed or filled that is, clay fillings and gouge. Link to Active This link will always route to the current Active version of the standard. Two set of cables are required. Two versions are available:. The values given in parentheses are mathematical conversions to inch-pound units, which are provided for information only and are not considered standard.
It is beyond the scope of these test methods to consider significant digits used in analysis methods for engineering design.