1.1 本试验方法涵盖了土工合成材料标称厚度的测量，但纹理土工膜和一些结构化土工膜除外，其中压脚的整个表面无法与土工合成材料表面完全接触。 1.2 本试验方法不提供可变法向压应力下土工合成材料的厚度值。本试验方法确定标称厚度，不一定是最小厚度。 1.3 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。 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。 1.5 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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 厚度是用于控制许多土工合成材料质量的基本物理特性之一。计算某些土工合成材料特性（如渗透性和拉伸应力等）时可能需要厚度值。 5.2 一些土工合成材料的厚度可能会随着施加的正常荷载而发生很大变化。该方法中显示了施加压力的具体压力和表面，以确保所有结果具有可比性。 5.3 本试验方法可用于本方法适用的土工合成材料商业装运的验收试验（见 1.1 ). 注1: 用户应注意，某些材料的压缩性、回弹特性和其他现象会影响某些土工合成材料在卷起、运输和储存后的厚度。

1.1 This test method covers the measurement of the nominal thickness of geosynthetics, except textured and some structured geomembranes where the entire surface of the presser foot cannot come into complete contact with the geosynthetic surface. 1.2 This test method does not provide thickness values for geosynthetics under variable normal compressive stresses. This test method determines nominal thickness, not necessarily minimum thickness. 1.3 The values stated in SI units are to be regarded as 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 Thickness is one of the basic physical properties used to control the quality of many geosynthetics. Thickness values can be required for calculation of some geosynthetics properties such as permeability and tensile stress, among others. 5.2 The thickness of some geosynthetics may vary considerably with the applied normal load. Specific pressures and surfaces on which they are applied are indicated in this method to ensure all results are comparable. 5.3 This test method may be used for acceptance testing of commercial shipments of geosynthetics for which this method is applicable (see 1.1 ). Note 1: The user should be aware that the compressibility of some materials, their rebound characteristics, and other phenomenon will affect the thickness of some geosynthetics, following the time when they are rolled up, shipped, and stored.