1.1 本试验方法描述了破坏性质量控制和质量保证试验，用于确定热熔法产生的土工膜接缝的完整性。本试验方法介绍了用于确定经过剥离和剪切试验的非二元粘结接缝质量的程序。这些试验程序仅适用于非增强土工膜。 1.2 用于建造土工膜接缝的热场接缝技术类型包括以下几种: 1.2.1 热空气-- 该技术在两个土工膜表面之间引入高温空气或气体，以便于熔化。压力施加在顶部或底部土工膜上，迫使两个表面结合在一起形成连续的结合。 1.2.2 热楔（或刀）-- 这项技术通过在两个土工膜表面之间运行热金属楔来熔化它们。向顶部或底部土工膜或两者施加压力，以形成连续的粘结。这种类型的一些接缝是由非粘结间隙分隔的双键轨道制成的。这些接缝有时被称为双热楔接缝或双轨接缝。 1.2.3 挤压-- 该技术包括在两个土工膜之间或两个重叠土工膜的边缘挤出熔融树脂，以实现连续粘合。 1.3 本试验方法涵盖的材料类型包括以下内容: 1.3.1 极低密度聚乙烯（VLDPE）。 1.3.2 线性下限- 密度聚乙烯（LLDPE）。 1.3.3 非常柔韧的聚乙烯（VFPE）。 1.3.4 线性中密度聚乙烯（LMDPE）。 1.3.5 高密度聚乙烯（HDPE）。 1.3.6 聚氯乙烯（PVC）。 1.3.7 柔性聚丙烯（fPP）。 注1: 聚乙烯标识符显示在 1.3.1– 1.3.5 描述通常使用该测试方法测试的材料类型。这些是行业公认的商品说明，不是基于材料密度的技术材料分类。 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====== 4.1 使用土工膜作为屏障材料来限制液体在土壤和岩石中从一个位置迁移到另一个位置，这就需要一种标准的测试方法来评估通过热熔方法产生的土工膜接缝的质量。在土工膜的情况下，很明显，在某些条件下，土工膜接缝可以在现场表现出分离。 尽管这是一种用于质量保证和质量控制目的的指数型测试方法，但它也旨在为质量保证工程师提供足够的接缝剥离和剪切数据，以评估接缝质量。记录和报告数据，如剥离试验期间发生的分离和剪切试验期间的伸长率，将使质量保证工程师能够采取必要措施，确保在设施施工期间修复劣质接缝，从而最大限度地减少服务中接缝分离的可能性。

1.1 This test method describes destructive quality control and quality assurance tests used to determine the integrity of geomembrane seams produced by thermo-fusion methods. This test method presents the procedures used for determining the quality of nonbituminous bonded seams subjected to both peel and shear tests. These test procedures are intended for nonreinforced geomembranes only. 1.2 The types of thermal field seaming techniques used to construct geomembrane seams include the following: 1.2.1 Hot Air— This technique introduces high-temperature air or gas between two geomembrane surfaces to facilitate melting. Pressure is applied to the top or bottom geomembrane, forcing together the two surfaces to form a continuous bond. 1.2.2 Hot Wedge (or Knife)— This technique melts the two geomembrane surfaces to be seamed by running a hot metal wedge between them. Pressure is applied to the top or bottom geomembrane, or both, to form a continuous bond. Some seams of this kind are made with dual bond tracks separated by a nonbonded gap. These seams are sometimes referred to as dual hot wedge seams or double-track seams. 1.2.3 Extrusion— This technique encompasses extruding molten resin between two geomembranes or at the edge of two overlapped geomembranes to effect a continuous bond. 1.3 The types of materials covered by this test method include the following: 1.3.1 Very low-density polyethylene (VLDPE). 1.3.2 Linear low-density polyethylene (LLDPE). 1.3.3 Very flexible polyethylene (VFPE). 1.3.4 Linear medium-density polyethylene (LMDPE). 1.3.5 High-density polyethylene (HDPE). 1.3.6 Polyvinyl chloride (PVC). 1.3.7 Flexible polypropylene (fPP). Note 1: The polyethylene identifiers presented in 1.3.1 – 1.3.5 describe the types of materials typically tested using this test method. These are industry-accepted trade descriptions and are not technical material classifications based upon material density. 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 ====== 4.1 The use of geomembranes as barrier materials to restrict liquid migration from one location to another in soil and rock has created a need for a standard test method to evaluate the quality of geomembrane seams produced by thermo-fusion methods. In the case of geomembranes, it has become evident that geomembrane seams can exhibit separation in the field under certain conditions. Although this is an index-type test method used for quality assurance and quality control purposes, it is also intended to provide the quality assurance engineer with sufficient seam peel and shear data to evaluate seam quality. Recording and reporting data, such as separation that occurs during the peel test and elongation during the shear test, will allow the quality assurance engineer to take measures necessary to ensure the repair of inferior seams during facility construction, and therefore, minimize the potential for seam separation in service.