1.1 本试验方法涵盖了使用径向流装置在不同法向压缩应力下测定土工合成材料平面内透过率的程序。该测试旨在作为主要用于土工布的指数测试，尽管由土工布和土工布类型材料组成的其他产品可能适合使用该测试方法进行测试。 1.2 本试验方法基于土工合成材料的透射率与流动方向无关的假设，因此，仅限于在所有方向上具有相似透射率的土工合成材料，并且不应用于具有定向流动行为的材料。 1.3 本试验方法专门针对透射率值约为或小于2×10的土工合成材料开发 −4. m 2. /s、 考虑使用测试方法 D4716/D4716M 对于透射率值高于2×10的土工合成材料 −4. m 2. /s。 1.4 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。将两个系统的值合并可能会导致不符合标准。 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 该试验方法是一种指数试验，用于估计和比较一种或几种备选土工合成材料在特定梯度和应力条件下的平面内水力透射率。 5.2 本试验方法可用于土工合成材料商业装运的验收试验，但由于实验室间精度信息不完整，建议谨慎。按照中的指示进行比较测试 5.2.1 是可取的。 5.2.1 如果使用本程序验收商业货物时，由于报告的测试结果不同而产生争议，买方和供应商应首先确认已使用可比较的测试参数进行了测试，包括样品调节、法向应力、液压系统梯度、，然后应进行比较测试，以确定其实验室之间是否存在统计偏差。建议为调查偏差提供称职的统计协助。 作为最低要求，双方应采取一组尽可能均匀的试样，这些试样由大量相关材料制成。应将试样随机分配到每个实验室进行测试。两个实验室的平均结果应使用学生的 t -测试未配对数据和双方在测试开始前选择的可接受概率水平。如果发现偏差，必须找到并纠正其原因，或者买方和供应商必须同意根据已知偏差解释未来的测试结果。

1.1 This test method covers the procedure for determining the in-plane transmissivity of geosynthetics under varying normal compressive stresses using a radial flow apparatus. The test is intended to be an index test used primarily for geotextiles, although other products composed of geotextiles and geotextile-type materials may be suitable for testing with this test method. 1.2 This test method is based on the assumption that the transmissivity of the geosynthetic is independent of orientation of the flow and is, therefore, limited to geosynthetics that have similar transmissivity in all directions and should not be used for materials with oriented flow behavior. 1.3 This test method has been developed specifically for geosynthetics that have transmissivity values on the order of or less than 2 × 10 −4 m 2 /s. Consider using Test Method D4716/D4716M for geosynthetics with transmissivity values higher than 2 × 10 −4 m 2 /s. 1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 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 This test method is an index test to estimate and compare the in-plane hydraulic transmissivity of one or several candidate geosynthetics under specific gradient and stress conditions. 5.2 This test method may be used for acceptance testing of commercial shipments of geosynthetics, but caution is advised since information about between-laboratory precision is incomplete. Comparative tests as directed in 5.2.1 are advisable. 5.2.1 In case of a dispute arising from differences in reported test results when using this procedure for acceptance of commercial shipments, the purchaser and the supplier should first confirm that the tests have been conducted using comparable test parameters including specimen conditioning, normal stress, hydraulic system gradient, etc. Comparative tests then should be conducted to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are formed from a lot of the material in question. The test specimens should be assigned randomly to each laboratory for testing. The average results from the two laboratories should be compared using the Student's t -test for unpaired data and an acceptable probability level chosen by the two parties before testing is begun. If bias is found, either its cause must be found and corrected or the purchaser and supplier must agree to interpret future test results in light of the known bias.