1.1 本试验方法旨在测定土工合成材料在承受持续拉伸载荷时在恒温下的无侧限拉伸蠕变和蠕变断裂行为。本试验方法适用于所有土工合成材料。 1.2 该测试方法测量土工合成测试样本从加载时开始的总伸长率，同时保持在恒定温度。它包括测量条件无侧限土工合成材料在恒温下的拉伸蠕变和蠕变断裂行为的程序，以及计算张力以绘制蠕变和蠕变断裂曲线的方向。 1.3 以SI单位表示的值应被视为标准。括号中给出的值仅供参考。 1.4 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（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》中确立的国际公认的标准化原则制定的。 ======意义和用途====== 5.1 本试验方法用于测定土工合成材料在持续加载条件下可能发生的随时间或破裂时间的预期总伸长率。 5.1.1 试验数据可与解释方法结合使用，以确定设计载荷下的蠕变应变势。5.1.2 试验数据可与解释方法结合使用，以确定各种载荷下的蠕变断裂潜力。 5.2 本试验方法不适用于土工合成材料的常规验收试验。本试验方法应用于表征土工合成材料，在这些土工合成材料中，蠕变或蠕变破裂是值得关注的。当使用试验结果进行设计时，必须考虑试验期间施加的平面应变或破裂条件。 5.3 该试验方法与其他测量拉伸蠕变和蠕变断裂行为的试验方法的基本区别是:（ 1 ）样品的宽度（截面 8 ），和（ 2 )测量从试样加载时刻到断裂的总伸长率随时间的变化或时间。本试验方法中规定的较大试样宽度最小化了许多土工合成材料中出现的收缩边缘效应（颈缩），并提供了与实际材料行为更密切的关系在平面应变拉伸条件下。 5.4 给定土工合成材料的蠕变或应力破裂在土壤中可能会减少，因为围压和荷载传递到土壤中。无约束环境代表受控测试，其中结果相对于材料在使用中的行为是保守的。密闭或土内测试可以更准确地模拟土工合成材料的现场行为。

1.1 This test method is intended for use in determining the unconfined tension creep and creep rupture behavior of geosynthetics at constant temperature when subjected to a sustained tensile loading. This test method is applicable to all geosynthetics. 1.2 The test method measures total elongation of the geosynthetic test specimen, from the time of loading, while being maintained at a constant temperature. It includes procedures for measuring the tension creep and creep rupture behavior at constant temperature of conditioned unconfined geosynthetics as well as directions for calculating tension forces to plot creep and creep rupture curves. 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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 This test method is developed for use in the determination of anticipated total elongation over time or time to rupture that may occur in geosynthetics under sustained loading conditions. 5.1.1 The test data can be used in conjunction with interpretive methods to determine creep strain potential at design loads. 5.1.2 The test data can be used in conjunction with interpretive methods to determine creep rupture potential at various loads. 5.2 This test method is not intended for routine acceptance testing of geosynthetics. This test method should be used to characterize geosynthetics intended for use in reinforcement applications in which creep or creep rupture is of concern. The plane strain or rupture condition imposed during testing must be considered when using the test results for design. 5.3 The basic distinctions between this test method and other test methods for measuring tension creep and creep rupture behavior are: ( 1 ) the width of the specimens (Section 8 ), and ( 2 ) the measurement of total elongation over time or time to rupture from the moment of specimen loading. The greater widths of the specimens specified in this test method minimize the contraction edge effect (necking) that occurs in many geosynthetic materials and provides a closer relationship to actual material behavior in plane strain tension conditions. 5.4 The creep or stress rupture of a given geosynthetic is likely to be reduced in soil because of confining stresses and load transfer to the soil. The unconfined environment represents a controlled test in which the results are conservative with regard to the behavior of the material in service. Confined or in-soil testing may model the field behavior of the geosynthetic more accurately.