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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Sliding on and shearing of the asperities can occur simultaneously. 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.
This test method establishes requirements and laboratory procedures for performing direct shear strength tests on rock specimens. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Note 1—The term “normal force” is used in the title instead of normal stress because of the indefinable area of contact and the minimal relative displacement between upper and lower halves of the specimen during testing.
Only one discontinuity per specimen can be tested. The constant normal load boundary condition is appropriate for problems where the normal stress is constant along the discontinuity.
During the test, shear strength is determined at various applied stresses normal to the sheared plane ashm at various shear displacements. 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.
Reliable results depend on many factors, Practice D provides a means of evaluating some of those factors. The test is usually conducted in the undrained state with an applied constant normal load.
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Clearly label the sample with source, date taken, intact or sliding friction, and a short, unambiguous, identification code. Shear box made in aluminium alloy Maximun axial and shear load capacity: The constant normal load boundary condition may not be d5670 for problems where shearing is dilatancy controlled and the normal stress is not constant along the discontinuity.
When the normal force is not sufficient to restrain dilation, the shear mechanism consists of the overriding of the asperities.
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.
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.
Discontinuities may be open, partially or completely healed or filled that is, clay fillings and gouge. Only one discontinuity per specimen can be tested.
Report of direct shear strengths five to nine pages depending on sample type including the following:. Therefore, the precise prediction of rock mass behavior is difficult. Examples of an artificial discontinuity include a rock-concrete interface or a lift line from a concrete pour.
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Displacement and load readings shall be acquired by suitable datalogger that has to be add as accessory. 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 d56007. For more info please refer to Releted Products below and Accessories section.
However, a clean, open discontinuity may be zstm draining, and, therefore, a test on a clean, open discontinuity could be considered a drained test. 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.
SET OF 4 DIAL GAUGES TO ASTM D | Matest
Two set of cables are required. Historical Version s – view previous versions of standard. Two versions are available:.
Two versions can be used to complete the testing configuration: Link to Active This link will always route to the current Active version of the standard. It is a simple and practical method of determining the strength and slope stability of rock, both in the field and in the laboratory.
Relationships d607 from the test data include shear strength versus normal stress and shear stress versus shear displacement shear stiffness.
The values given in parentheses are mathematical conversions to inch-pound units, which are provided for information only and are not considered standard.