1.1 本试验方法用于确定排水土工布、土工复合材料、土工网或任何其他与恒温排水相关的土工合成材料在承受恒定压缩应力时的无侧限压缩变形（固结）特性。 1.2 本试验方法仅用于无侧限抗压性能变形试验。有关如何建立指数测试的详细程序，请参阅EN ISO 25619-1。对于性能测试，试样应经受特定于位置的液体、特定于位置的应力（上部和平行加载板上的法向和潜在切向应力）或两者。 注1: 无侧限抗压性能变形测试的结果可能不同于在受限条件下进行的测试。 1.3 由于土工合成材料行业的性质不断变化，以及现有的产品种类繁多，对于某些产品的无侧限压缩变形测试，可能需要对这种特殊的测试方法稍作修改。 1.4 以国际单位制给出的数值将被视为标准。括号中给出的值仅供参考。 1.5 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。 1.6 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 排水土工合成材料的性能特征与压缩荷载下的完整性直接相关。 如果产品对压缩变形敏感，其流动能力可能会大大降低，甚至完全关闭。 5.2 可以在现场模拟的法向应力和潜在切向应力下测试候选土工合成材料的变形敏感性。 5.3 本试验方法不评估土工织物过滤器或相邻膜变形的影响。 5.4 压缩变形与土工合成排水产品的流量减少有关，具体取决于制造商和产品。例如，10 % 制造商a制造的土工网原始厚度的减少不一定等于10 % 制造商B制造的相同或其他类型土工网的厚度减少。 5.5 这种变形数据直接对最终用户有好处，因为它可以很容易地解释为压缩变形的折减系数。 4. 然后可以使用折减系数得出允许的流速。 5.

1.1 This test method is used to determine the unconfined compressive deformation (consolidation) characteristics of drainage geotextiles, geocomposites, geonets, or any other geosynthetic associated with drainage at a constant temperature, when subjected to a constant compressive stress. 1.2 This test method is intended for use as an unconfined compressive performance deformation test only. For a detailed procedure on how to establish an index test, see EN ISO 25619-1. For performance tests, the specimen shall be subjected to the site-specific liquid, the site-specific stress (normal and potentially a tangential stress on the upper and parallel loading platen), or both. Note 1: Results achieved from unconfined compressive performance deformation testing may differ from testing performed under confined conditions. 1.3 Because of the changing nature of the geosynthetic industry and the wide variety of products already available, this particular test method may have to be slightly modified for unconfined compression deformation testing of some products. 1.4 The values given in SI units are to be considered as the standard. The values given in parentheses are for information only. 1.5 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. 1.6 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 The performance characteristics of a drainage geosynthetic are directly related to the integrity under compressive loading. If the product is sensitive to compressive deformation, its flow capacity could be greatly reduced or even shut off completely. 5.2 The deformation sensitivity of a candidate geosynthetic can be tested at field-simulated normal stress and potential tangential stresses. 5.3 This test method does not evaluate the effect of deformation of a geotextile filter or adjacent membrane. 5.4 Compression deformation, as it relates to reduction in flow capacity of a geosynthetic drainage product, is manufacturer and product specific. For example, a 10 % reduction in original thickness of a geonet made by Manufacturer A does not necessarily equal the same reduction in flow capacity as a 10 % reduction in thickness of the same or another type of geonet made by Manufacturer B. 5.5 This deformation data has merit directly to the end user, because it can be easily interpreted to result in a reduction factor for compressive deformation. 4 The reduction factor can then be used to derive an allowable flow rate. 5