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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Two versions can be used to complete the testing configuration: The test is usually conducted in wstm undrained state with an applied constant normal load.
Relationships derived from the test data include shear strength versus normal stress and shear stress versus shear displacement shear stiffness. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
It includes procedures d5067 both intact d6507 strength and sliding friction tests, which can be performed on specimens that are homogeneous, or have planes of weakness, including natural or artificial discontinuities. Print and complete the following order form. 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. When the normal load is large enough to completely restrain dilation, the shear mechanism consists of the shearing off of the asperities.
The apparatus consists of a shear box designed to accept samples not larger than x mm, or alternatively cores up to mm dia.
Examples of an artificial discontinuity include a rock-concrete interface or a lift line from a concrete pour. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of ast, limitations prior to use.
Please contact a CTLGroup chemical services representative or Project Manager to discuss your individual project needs and testing response times. Two versions are available:.
Sliding on and shearing of the asperities can occur simultaneously. This apparatus was originally developed at Imperial college, London, by Professor E.
The values given in parentheses are mathematical conversions to inch-pound units, which are provided for information only and are not considered standard.
Rock shear box apparatus
It is a simple and practical method of determining the strength and slope stability of rock, both in the field and in the laboratory. Shear box made in aluminium alloy Maximun axial and shear load capacity: Active view current version of standard. Therefore nominal area is used for loading purposes and calculations. The constant normal load boundary condition is appropriate for problems where the normal stress is constant along the discontinuity.
For more info please refer to Releted Products below and Accessories section. Only one discontinuity per specimen can be tested. Discontinuities may be open, partially or completely healed or filled that is, clay fillings and gouge. 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.
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.
However, a clean, open discontinuity may be free draining, and, therefore, a test on a clean, open discontinuity could be considered a drained test. 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.
Results Produced Report of direct shear strengths five to nine pages depending on sample type including the following: Order Form 2 Email complete form to contact listed below. The normal loading system 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. 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.
Instructions Samples should be concrete or rock cores with a diameter no greater than Samples should be sealed in a plastic wrap inside their shipping container, protected against air, moisture, and direct sunlight.
Report of direct shear strengths five to nine pages depending on sample type including the following:. 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.
Examples of an artificial discontinuity include a rock-concrete interface or a lift line from a concrete pour. 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.
A summary of peak shear stress, peak residual shear stresses, and residual shear stresses A figure of peak residual stress and residual shear stress vs.
Testing equipment for the construction industry – CONTROLS
qstm Displacement and load readings shall be acquired by suitable datalogger that has to be add as accessory. Since this test method d567 no provision for the measurement of pore pressures, the strength values determined are expressed in terms of total stress, uncorrected for pore pressure.
Only one discontinuity per specimen can be tested. Reliable results depend on many factors, Practice D provides a means of evaluating some of those factors. The actual contact areas during testing change, but the actual total contact surface is unmeasurable. Therefore, the precise prediction of rock mass behavior is difficult.
The actual contact areas during testing change, but the actual total contact surface is unmeasurable.