1.1 该试验方法是一种指数试验，用于测量通过梯形法在编织或非织造土工布中继续或传播撕裂所需的力。虽然梯形撕裂试验对质量控制和验收试验很有用，但它并不能提供所有设计应用所需的所有信息，应使用其他试验方法。 1.2 本试验方法适用于大多数土工布，包括用于土工布应用的机织织物、非织造织物、层状织物、针织织物和毡。 1.3 以国际单位制或英寸磅单位表示的数值应单独视为标准。每个系统中规定的值不一定是完全相等的；因此，为了确保符合标准，每个系统应独立使用，并且两个系统的值不得合并。 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 梯形撕裂法是一种沿着合理定义的过程产生张力的测试，从而使撕裂在试样的宽度上传播。 机织物的梯形撕裂强度主要由夹持在夹子中的纱线的性能决定。在非织造织物中，由于单个纤维或多或少是随机取向的，并且能够在施加载荷的方向上进行一些重新取向，因此当对进一步重新取向的阻力大于同时使一个或多个纤维断裂所需的力时，达到最大梯形撕裂强度。 5.2 梯形撕裂强度法可用于估算不同织物或同一织物中不同方向的相对撕裂阻力。 5.3 该测试方法可用于商业装运的验收测试；然而，由于有关- 实验室精度不完全。中所述的对比试验 5.3.1 可能是可取的。 5.3.1 如果在使用该测试方法进行商业货物验收测试时，由于报告的测试结果存在差异而产生争议，买方和供应商应进行比较测试，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适当的统计协助。至少，双方应采取一组尽可能均匀的试样，这些试样来自大量相关类型的材料。然后，应将试样以相等的数量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适当的学生的 吨 -测试和双方在测试开始前选择的可接受的概率水平。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。 5.4 大多数土工织物都可以通过这种测试方法进行测试。对于给定的织物，可能需要对夹紧技术进行一些修改，这取决于其结构。可能需要对结实的织物或玻璃纤维织物进行特殊调整，以防止它们在夹具中滑动或因夹在夹具中而损坏。 5.5 该试验方法可用于恒速横移（CRT）或恒速拉伸（CRE）型张力机。 然而，用CRT机器和CRE机器获得的结果之间可能没有总体相关性。因此，这两个张力测试仪不能互换使用。如有争议，以CRE机器为准。

1.1 This test method is an index test used to measure the force required to continue or propagate a tear in woven or nonwoven geotextiles by the trapezoid method. While useful for quality control and acceptance testing, the trapezoid tear test does not provide all the information needed for all design applications and other test methods should be used. 1.2 This test method is applicable to most geotextiles that include woven fabrics, nonwoven fabrics, layered fabrics, knit fabrics, and felts that are used for geotextile applications. 1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 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 trapezoid tear method is a test that produces tension along a reasonably defined course such that the tear propagates across the width of the specimen. The trapezoid tearing strength for woven fabrics is determined primarily by the properties of the yarns that are gripped in the clamps. In nonwoven fabrics, because the individual fibers are more or less randomly oriented and capable of some reorientation in the direction of the applied load, the maximum trapezoid tearing strength is reached when the resistance to further reorientation is greater than the force required to rupture one or more fibers simultaneously. 5.2 The trapezoid tearing strength method is useful for estimating the relative tear resistance of different fabrics or different directions in the same fabric. 5.3 This test method may be used for acceptance testing of commercial shipments; however, caution is advised since information about between-laboratory precision is incomplete. Comparative tests as directed in 5.3.1 may be advisable. 5.3.1 In case of a dispute arising from differences in reported test results when using this test method for acceptance testing of commercial shipments, the purchaser and the supplier should conduct comparative tests 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 from a lot of material of the type in question. Test specimens should then be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using the appropriate Student's t -test and an acceptable probability level chosen by the two parties before testing is begun. If a bias is found, either its cause must be found and corrected or the purchaser and the supplier must agree to interpret future test results in the light of the known bias. 5.4 Most geotextile fabrics can be tested by this test method. Some modification of clamping techniques may be necessary for a given fabric, depending upon its structure. Special adaptation may be necessary with strong fabrics, or fabrics made from glass fibers, to prevent them from slipping in the clamps or being damaged as a result of being gripped in the clamps. 5.5 This test method may be used with constant-rate-of-traverse (CRT) or constant-rate-of-extension (CRE) type tension machines. However, there may be no overall correlation between the results obtained with the CRT machine and the CRE machine. Consequently, these two tension testers cannot be used interchangeably. In case of controversy, the CRE machine shall prevail.