1.1 本试验方法包括通过圆盘形试样的径向线压缩测定岩石劈裂抗拉强度的试验装置、试样制备和试验程序。 注1: 通过直拉试验以外的试验确定的岩石抗拉强度被指定为“间接”抗拉强度，特别是第 9 这种试验的强度称为“劈裂”抗拉强度。这种测试方法有时也被称为巴西测试方法。 1.2 单位- 以国际单位制表示的数值应视为标准。括号中给出的值是英寸磅单位的数学转换，仅供参考，不被视为标准。以SI以外的单位报告试验结果不应被视为不符合本试验方法。 1.3 所有观测值和计算值应符合实践中制定的有效数字和四舍五入指南 D6026型 。 1.3.1 本标准中用于规定如何收集/记录或计算数据的程序被视为行业标准。此外，它们代表了通常应保留的有效数字。所使用的程序不考虑材料变化、获取数据的目的、特殊目的研究或用户目标的任何考虑；并且通常的做法是增加或减少报告数据的有效数字以与这些考虑相称。考虑工程设计分析方法中使用的有效数字超出了本标准的范围。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 根据定义，拉伸强度是通过直接拉伸试验获得的。然而，直接拉伸试验对于常规应用来说是困难且昂贵的。劈裂拉伸试验似乎提供了一种理想的替代方案，因为它更简单、更便宜。 此外，参与岩石力学设计的工程师通常处理复杂的应力场，包括压应力场和拉应力场的各种组合。在这种条件下，应在存在压缩应力的情况下获得拉伸强度，以代表现场条件。 5.2 劈裂抗拉强度试验是出现这种应力场的最简单的试验之一。此外，通过在不同径向方向上进行测试，可以确定各向异性岩石抗拉强度的任何变化。由于它在实践中被广泛使用，因此需要一种统一的测试方法才能使数据具有可比性。还需要进行均匀试验，以确保圆盘试样由于垂直于加载轴的拉伸应力而在直径方向上断裂。 注2: 本标准产生的结果的质量取决于执行该标准的人员的能力以及所用设备和设施的适用性。符合实践标准的机构 第3740页 通常被认为能够胜任和客观的测试/取样/检查等。本标准的使用者应注意遵守实践 第3740页 其本身不能保证可靠的结果。可靠的结果取决于许多因素；实践 第3740页 提供了评估其中一些因素的方法。

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. ====== 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.