1.1 该试验方法包括在承受特定法向压缩载荷时，土工织物在垂直于土工织器平面的方向上的介电常数行为的测定。 1.2 该试验方法仅限于土工织物。本试验方法不适用于土工布相关产品，如土工格栅、土工网、土工膜和其他土工复合材料。 1.3 以国际单位制表示的数值应视为标准。括号中给出的英寸磅单位仅供参考。 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。 1.5 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 土工织物的厚度随着法向压缩应力的增加而减小。根据土工布的初始结构和边界条件，厚度的减小可能导致土工布孔隙的部分闭合或打开。 5.2 该测试方法测量由于施加的压缩应力导致土工布孔隙结构变化而引起的介电常数。

1.1 This test method covers the determination of the water permittivity behavior of geotextiles in a direction normal to the plane of the geotextile when subjected to specific normal compressive loads. 1.2 Use of this test method is limited to geotextiles. This test method is not intended for application with geotextile-related products such as geogrids, geonets, geomembranes, and other geocomposites. 1.3 The values stated in SI units are to be regarded as the standard. The inch-pound units 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 The thickness of a geotextile decreases with increase in the normal compressive stress. This decrease in thickness may result in the partial closing or the opening of the voids of geotextile depending on its initial structure and the boundary conditions. 5.2 This test method measures the permittivity due to a change of void structure of a geotextile as a result of an applied compressive stress.