1.1 这些试验方法包括通过对宽试样施加循环拉伸载荷来测定土工格栅和土工织物的小应变拉伸性能。 1.2 这些试验方法（A、B和C）允许通过测量循环拉伸载荷和伸长率来确定小应变循环拉伸模量。 1.3 本试验方法旨在为设计提供特性。该测试方法是为需要输入钢筋拉伸模量的机械-经验路面设计方法开发的。对于涉及循环荷载的其他应用，应根据具体情况评估本试验方法中循环模量的使用情况- 根据具体情况。 1.4 提供了三种测试方法（A、B和C）来确定土工格栅和土工织物上的小应变循环拉伸模量。 1.4.1 试验方法A- 在循环张力下测试相对较宽的土工格栅试样，单位为kN/m（lbf/ft）。 1.4.2 试验方法B- 在循环张力（kN/m（lbf/ft））下测试相对较宽的土工格栅试样的多层。 1.4.3 试验方法C- 在循环张力下测试相对较宽的土工布样本，单位为kN/m（lbf/ft）。 1.5 以国际单位制表示的数值应视为标准值。括号中给出的值仅供参考，不被视为标准值。 1.6 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户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。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 试验方法A、B和C为涉及小应变循环荷载的应用提供了一种评估土工格栅和土工织物拉伸模量的方法。试验方法允许在规定应变或永久应变的不同水平下测定循环拉伸模量，从而说明循环拉伸模量随材料永久应变增加而可能发生的变化。这些测试方法应用于研究测试，并定义用于特定设计方法的特性。 5.2 如果在使用这些测试方法进行商业装运验收测试时，由于报告的测试结果不同而产生争议，买方和供应商应进行比较测试，以确定其实验室之间是否存在统计偏差。 建议为调查偏差提供称职的统计协助。作为最低要求，双方应尽可能均匀地从大量相关类型的材料中选取一组试样。然后，应将试样以相同数量随机分配给每个实验室进行测试。两个实验室的平均结果应使用学生的 t -测试未配对数据和双方在测试开始前选择的可接受概率水平。如果发现偏差，应找到并纠正其原因，或者买方和供应商应同意根据已知偏差解释未来的测试结果。 5.3 所有土工格栅都可以通过测试方法A或B进行测试。根据给定土工格栅的物理组成，可能需要对技术进行一些修改。可能需要对坚固的土工格栅、多层土工格栅或容易在夹具中滑动或容易被夹具损坏的土工格栅进行特殊调整。 5.4 大多数土工织物可通过试验方法C进行试验。根据其结构，可能需要对给定土工织物的夹紧技术进行一些修改。可能需要对坚固的土工布或玻璃纤维制成的土工布进行特殊的夹紧调整，以防止其在夹具中滑动或因夹持而受损。 5.5 这些测试方法适用于测试土工织物的干燥或潮湿。它与恒速拉伸式张力装置一起使用。 5.6 这些试验方法可能不适用于强度约为100 kN/m（600）的土工格栅和土工织物 磅/英寸）由于夹紧和设备限制。在这些情况下，100毫米（4英寸）宽度试样可替换为200 mm（8-in.）宽度试样。

1.1 These test methods cover the determination of small-strain tensile properties of geogrids and geotextiles by subjecting wide-width specimens to cyclic tensile loading. 1.2 These test methods (A, B, and C) allow for the determination of small-strain cyclic tensile modulus by the measurement of cyclic tensile load and elongation. 1.3 This test method is intended to provide properties for design. The test method was developed for mechanistic-empirical pavement design methods requiring input of the reinforcement tensile modulus. The use of cyclic modulus from this test method for other applications involving cyclic loading should be evaluated on a case-by-case basis. 1.4 Three test methods (A, B, and C) are provided to determine small-strain cyclic tensile modulus on geogrids and geotextiles. 1.4.1 Test Method A— Testing a relatively wide specimen of geogrid in cyclic tension in kN/m (lbf/ft). 1.4.2 Test Method B— Testing multiple layers of a relatively wide specimen of geogrid in cyclic tension in kN/m (lbf/ft). 1.4.3 Test Method C— Testing a relatively wide specimen of geotextile in cyclic tension in kN/m (lbf/ft). 1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses are provided for information only and are not considered standard. 1.6 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. 1.7 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 Test Methods A, B, and C provide a means of evaluating the tensile modulus of geogrids and geotextiles for applications involving small-strain cyclic loading. The test methods allow for the determination of cyclic tensile modulus at different levels of prescribed or permanent strain, thereby accounting for possible changes in cyclic tensile modulus with increasing permanent strain in the material. These test methods shall be used for research testing and to define properties for use in specific design methods. 5.2 In cases of dispute arising from differences in reported test results when using these test methods for acceptance testing of commercial shipments, the purchaser and supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens which are as homogeneous as possible and which are from a lot of material of the type in question. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using Student’s t -test for unpaired data and an acceptable probability level chosen by the two parties before the testing began. If a bias is found, either its cause shall be found and corrected or the purchaser and supplier shall agree to interpret future test results in light of the known bias. 5.3 All geogrids can be tested by Test Method A or B. Some modification of techniques may be necessary for a given geogrid depending upon its physical makeup. Special adaptations may be necessary with strong geogrids, multiple-layered geogrids, or geogrids that tend to slip in the clamps or those which tend to be damaged by the clamps. 5.4 Most geotextiles can be tested by Test Method C. Some modification of clamping techniques may be necessary for a given geotextile depending upon its structure. Special clamping adaptations may be necessary with strong geotextiles or geotextiles made from glass fibers to prevent them from slipping in the clamps or being damaged as a result of being gripped in the clamps. 5.5 These test methods are applicable for testing geotextiles either dry or wet. It is used with a constant rate of extension type tension apparatus. 5.6 These test methods may not be suited for geogrids and geotextiles that exhibit strengths approximately 100 kN/m (600 lbf/in.) due to clamping and equipment limitations. In those cases, 100-mm (4-in.) width specimens may be substituted for 200-mm (8-in.) width specimens.