1.1 该试验方法是一种指数试验，提供了一种使用抓斗法测定土工织物断裂载荷（抓斗强度）和伸长率（抓斗伸长率）的程序。此测试方法不适用于针织物，应使用其他测试方法。虽然该结果可用于特定织物结构的质量控制和验收测试，但只能在结构非常相似的织物之间进行比较，因为在该测试中，每个不同的织物结构都以独特的方式进行。 抓取测试方法不能提供所有设计应用程序所需的所有信息，应使用其他测试方法。 1.2 包括在干燥和潮湿状态下通过抓斗法测量断裂载荷和伸长率的程序；然而，除非协议或规范中另有规定，否则测试通常在干燥条件下进行。 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精确的等效值； 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应合并。 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 只要需要确定使用中织物的“有效强度”，即特定宽度下材料的强度，以及相邻材料贡献的额外强度，抓取方法就适用。抓握测试和剥离测试之间没有简单的关系，因为织物辅助的量取决于织物的结构。它作为质量控制或验收测试非常有用。 5.2 试验方法中的程序 D4632/D4632米 为了测定土工织物的抓持强度，可以用于商业货物的验收测试，但由于实验室之间的精度信息不完整，因此建议谨慎。中所述的对比试验 5.2.1 是可取的。 5.2.1 如果在使用试验方法中的程序时，由于报告的试验结果的差异而引起争议 D4632/D4632米 对于商业货物的验收测试，买方和制造商应进行比较测试，以确定其实验室之间是否存在统计偏差。 建议为偏见调查提供适当的统计协助。作为最低要求，双方应采取一组尽可能均匀的试样，这些试样来自大量相关类型的材料。然后，应将试样以相等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，或者买方和制造商必须同意根据已知偏差解释未来的测试结果。 5.3 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。可能需要对坚固的织物或玻璃纤维制成的织物进行特殊调整，以防止它们在夹具中滑动或因夹在夹具中而损坏，例如缓冲夹具或将试样放在夹具中。 5.4 该测试方法适用于测试织物的干态或湿态。它可以与恒定横向速率（CRT）或恒定拉伸速率（CRE）型张力机一起使用。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，应以CRE机器为准。

1.1 This test method is an index test which provides a procedure for determining the breaking load (grab strength) and elongation (grab elongation) of geotextiles using the grab method. This test method is not suitable for knitted fabrics and alternate test methods should be used. While useful for quality control and acceptance testing for a specific fabric structure, the results can only be used comparatively between fabrics with very similar structures because each different fabric structure performs in a unique and characteristic manner in this test. The grab test method does not provide all the information needed for all design applications and other test methods should be used. 1.2 Procedures for measuring the breaking load and elongation by the grab method in both the dry and wet state are included; however, testing is normally done in the dry condition unless specified otherwise in an agreement or specification. 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 grab method is applicable whenever it is desired to determine the “effective strength” of the fabric in use, that is, the strength of the material in a specific width, together with the additional strength contributed by adjacent material. There is no simple relationship between grab tests and strip tests since the amount of fabric assistance depends on the construction of the fabric. It is useful as a quality control or acceptance test. 5.2 The procedure in Test Method D4632/D4632M for the determination of grab strength of geotextiles may be used for acceptance testing of commercial shipments, 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 the procedures in Test Method D4632/D4632M for acceptance testing of commercial shipments, the purchaser and the manufacturer 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 which are from a lot of material of the type in question. The 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 manufacturer must agree to interpret future test results in the light of the known bias. 5.3 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, such as cushioning the clamp or boarding the specimen within the clamp. 5.4 This test method is applicable for testing fabrics either dry or wet. It 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.