ASTM D3967-23
(Test Method)Standard Test Method for Splitting Tensile Strength of Intact Rock Core Specimens with Flat Loading Platens
Standard Test Method for Splitting Tensile Strength of Intact Rock Core Specimens with Flat Loading Platens
SIGNIFICANCE AND USE
5.1 By definition, the tensile strength is obtained by the direct tensile test. However, the direct tensile test is difficult and expensive for routine application. The splitting tensile test appears to offer a desirable alternative because it is much simpler and inexpensive. Furthermore, engineers involved in rock mechanics design usually deal with complex stress fields, including various combinations of compressive and tensile stress fields. Under such conditions, the tensile strength should be obtained with the presence of compressive stresses to be representative of the field conditions.
5.2 The splitting tensile strength test is one of the simplest tests in which such stress fields occur. Also, by testing across different diametral directions, any variations in tensile strength for anisotropic rocks can be determined. Since it is widely used in practice, a uniform test method is needed for data to be comparable. A uniform test is also needed to make sure that the disk specimens break diametrically due to tensile stresses perpendicular to the loading axis.
Note 2: The quality of the results produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with Practice D3740 does not in itself assure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors.
SCOPE
1.1 This test method covers testing apparatus, specimen preparation, and testing procedures for determining the splitting tensile strength of rock by diametral line compression of disk shaped specimens.
Note 1: The tensile strength of rock determined by tests other than the straight pull test is designated as the “indirect” tensile strength and, specifically, the value obtained in Section 9 of this test is termed the “splitting” tensile strength. This test method is also sometimes referred to as the Brazilian test method.
1.2 Units—The values stated in SI units are to be regarded as standard. 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.
1.3 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026.
1.3.1 The procedures used to specify how data are collected/recorded or calculated, in this standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, the purpose for obtaining the data, special purpose studies, or any considerations for the user's objectives; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering design.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D3967 − 23
Standard Test Method for
Splitting Tensile Strength of Intact Rock Core Specimens
1
with Flat Loading Platens
This standard is issued under the fixed designation D3967; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
1.1 This test method covers testing apparatus, specimen
mendations issued by the World Trade Organization Technical
preparation, and testing procedures for determining the split-
Barriers to Trade (TBT) Committee.
ting tensile strength of rock by diametral line compression of
disk shaped specimens.
2. Referenced Documents
NOTE 1—The tensile strength of rock determined by tests other than the
2
straight pull test is designated as the “indirect” tensile strength and, 2.1 ASTM Standards:
specifically, the value obtained in Section 9 of this test is termed the
D653 Terminology Relating to Soil, Rock, and Contained
“splitting” tensile strength. This test method is also sometimes referred to
Fluids
as the Brazilian test method.
D2216 Test Methods for Laboratory Determination of Water
1.2 Units—The values stated in SI units are to be regarded
(Moisture) Content of Soil and Rock by Mass
as standard. The values given in parentheses are mathematical
D3740 Practice for Minimum Requirements for Agencies
conversions to inch-pound units, which are provided for
Engaged in Testing and/or Inspection of Soil and Rock as
information only and are not considered standard. Reporting of
Used in Engineering Design and Construction
test results in units other than SI shall not be regarded as
D6026 Practice for Using Significant Digits and Data Re-
nonconformance with this test method.
cords in Geotechnical Data
E4 Practices for Force Calibration and Verification of Test-
1.3 All observed and calculated values shall conform to the
ing Machines
guidelines for significant digits and rounding established in
E691 Practice for Conducting an Interlaboratory Study to
Practice D6026.
Determine the Precision of a Test Method
1.3.1 The procedures used to specify how data are collected/
E2586 Practice for Calculating and Using Basic Statistics
recorded or calculated, in this standard are regarded as the
industry standard. In addition, they are representative of the
3. Terminology
significant digits that generally should be retained. The proce-
3.1 Definitions:
dures used do not consider material variation, the purpose for
obtaining the data, special purpose studies, or any consider- 3.1.1 For definitions of common technical terms used in this
standard, refer to Terminology D653.
ations for the user’s objectives; and it is common practice to
increase or reduce significant digits of reported data to be
4. Summary of Test Method
commensurate with these considerations. It is beyond the scope
of this standard to consider significant digits used in analysis 4.1 Samples are selected from rock cores or cored from
methods for engineering design. platen samples for testing as described. A section of rock core
sample is cut perpendicular to the core axis to produce disk
1.4 This standard does not purport to address all of the
shape specimens until the required number of specimens are
safety concerns, if any, associated with its use. It is the
obtained. Each specimen is then marked to indicate the desired
responsibility of the user of this standard to establish appro-
orientation of the applied loading on the specimen by drawing
priate safety, health, and environmental practices and deter-
a diametral line on each end surface of the specimen. Each
mine the applicability of regulatory limitations prior to use.
specimen is positioned inside the testing machine in such a way
1.5 This international standard was developed in accor-
that the diametral line is coincidental with the loading axis of
dance with internationally recognized principles on standard-
the testing machine fitted with flat loading platens. Each
1
This test method is under the jurisdiction of ASTM Committee D18 on Soil and
2
Rock and is the direct responsibility of Subcommittee D18.12 on Rock Mechanics. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved May 15, 2023. Published June 2023. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1981. Last previous edition approved in 2016 as D39
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D3967 − 16 D3967 − 23
Standard Test Method for
Splitting Tensile Strength of Intact Rock Core Specimens
1
with Flat Loading Platens
This standard is issued under the fixed designation D3967; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This test method covers testing apparatus, specimen preparation, and testing procedures for determining the splitting tensile
strength of rock by diametral line compression of disk shapeshaped specimens.
NOTE 1—The tensile strength of rock determined by tests other than the straight pull test is designated as the “indirect” tensile strength and, specifically,
the value obtained in Section 9 of this test is termed the “splitting” tensile strength. This test method is also sometimes referred to as the Brazilian test
method.
1.2 Units—The values stated in SI units are to be regarded as standard. 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.
1.3 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice
D6026.
1.3.1 The procedures used to specify how data are collected/recorded or calculated, in this standard are regarded as the industry
standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not
consider material variation, the purpose for obtaining the data, special purpose studies, or any considerations for the user’s
objectives; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these
considerations. It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering
designdesign.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and healthsafety, health, and environmental practices and determine
the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D653 Terminology Relating to Soil, Rock, and Contained Fluids
1
This test method is under the jurisdiction of ASTM Committee D18 on Soil and Rock and is the direct responsibility of Subcommittee D18.12 on Rock Mechanics.
Current edition approved Nov. 1, 2016May 15, 2023. Published November 2016June 2023. Originally approved in 1981. Last previous edition approved in 20082016 as
D3967 – 08.D3967 – 16. DOI: 10.1520/D3967-16.10.1520/D3967-23.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standardsvolume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D3967 − 23
D2216 Test Methods for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass
D3740 Practice for Minimum Requirements for Agencies Engaged in Testing and/or Inspection of Soil and Rock as Used in
Engineering Design and Construction
D6026 Practice for Using Significant Digits and Data Records in Geotechnical Data
E4 Practices for Force Calibration and Verification of Testing Machines
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E2586 Practice for Calculating and Using Basic Statistics
3. Terminology
3.1 Definitions:
3.1.1 For common definitions of common technical terms used in this standard, refer to Terminology D653.
4. Summary of Test Method
4.1 Samples are selected
...
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