1.1 本试验方法包括使用步进等温法（SIM）对压缩蠕变性能进行加速试验。 1.2 试验方法主要针对土工合成排水材料，如HDPE土工网试样。 1.3 SIM试验是基于时间-温度叠加程序的横向无侧限试验。 1.4 斜坡和保持（R+H）测试可以与SIM测试一起完成。它们被设计为提供适用于SIM结果的初始快速压缩蠕变应变水平的额外估计。 1.5 该方法可用于建立土工合成材料的持续载荷压缩蠕变特性，该特性证明了时间依赖行为与温度之间的关系。该方法的结果将用于增加在20±1下进行的压缩蠕变试验的结果 °C，不得用作确定土工合成材料长期压缩蠕变行为的唯一依据。 1.6 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.7 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。 1.8 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 SIM的使用减少了发生蠕变和获得相关数据所需的时间。 5.2 声明载于 1.5 在意义和用途以及标准范围方面都非常重要。 5.3 蠕变试验数据用于计算材料的蠕变模量作为时间的函数。然后，这些数据用于预测排水应用中使用的土工合成材料的长期蠕变变形。 注1: 目前，SIM测试主要集中在由高- 密度聚乙烯。其他材料的附加测试正在进行中。 5.4 进行R+H试验是为了确定在载荷斜坡峰值之后的非常快速的响应的短时间内所经历的蠕变应变的范围。

1.1 This test method covers accelerated testing for compressive creep properties using the stepped isothermal method (SIM). 1.2 The test method is focused on geosynthetic drainage materials such as HDPE geonet specimens. 1.3 The SIM tests are laterally unconfined tests based on time-temperature superposition procedures. 1.4 Ramp and hold (R+H) tests may be completed in conjunction with SIM tests. They are designed to provide additional estimates of the initial rapid compressive creep strain levels appropriate for the SIM results. 1.5 This method can be used to establish the sustained load compressive creep characteristics of a geosynthetic that demonstrates a relationship between time-dependent behavior and temperature. Results of this method are to be used to augment results of compressive creep tests performed at 20 ± 1 °C and may not be used as the sole basis for determination of long-term compressive creep behavior of geosynthetic material. 1.6 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.7 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. 1.8 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 Use of the SIM decreases the time required for creep to occur and the obtaining of the associated data. 5.2 The statements set forth in 1.5 are very important in the context of significance and use, as well as scope of the standard. 5.3 Creep test data are used to calculate the creep modulus of materials as a function of time. These data are then used to predict the long-term creep deformation expected of geosynthetics used in drainage applications. Note 1: Currently, SIM testing has focused mainly on geonets made from high-density polyethylene. Additional testing on other materials is ongoing. 5.4 R+H testing is done to establish the range of creep strains experienced in the brief period of very rapid response following the peak of the load ramp.