1.1 本指南提供了一个指南，规定了排水土工合成产品；它特别提供了确定候选排水土工合成材料允许流速的建议。然后将所得值与产品特定和现场特定安全系数的所需（或设计）流速进行比较。 1.2 本指南旨在帮助设计师、采购商、安装商、承包商、业主、运营商和机构制定排水土工复合材料的最低指南。本指南不用于制造商的质量控制目的，也不是施工质量保证规范。 1.3 本指南不涉及所需（或设计）流量值，也不涉及后续安全系数值，这些值通常是特定于设计的。 1.4 本指南中建议的程序使用ASTM试验方法。 1.5 本指南适用于所有类型的排水土工复合材料，无论其核心配置或土工布类型。它还可用于评估提供排水的厚非织造土工布。 1.6 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。 1.7 本指南提供了有组织的信息收集或一系列选项，并不推荐具体的行动方案。本指南不能取代教育或经验，应与专业判断结合使用。并非本指南的所有方面都适用于所有情况。本指南无意代表或取代必须根据其判断特定专业服务是否充分的谨慎标准，也不应在不考虑项目的许多独特方面的情况下应用本指南。 本指南标题中的“标准”一词仅表示本指南已通过ASTM国际共识程序获得批准。 1.8 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。 1.9 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====== 4.1 本指南旨在帮助设计师、采购商、安装商、承包商、业主、运营商和机构制定指定排水土工复合材料的最低标准。具体而言，本指南提出了一种确定候选排水土工合成材料允许流速的方法。然后将所得值与产品特定和现场特定安全系数的所需（或设计）流速进行比较。 4.2 众所周知，还有其他产品可能达到相同的性能要求，但未在本文件中列出。 请此类产品的制造商使用适当的信息实施本标准指南。 4.3 应当认识到，各方、组织或代表可以进行本指南要求以外的其他测试。在这种情况下，将优先进行更严格的项目特定测试。 4.4 通过模拟现场特定条件（包括现场特定液体和温度，负载持续时间超过100小时、化学/生物堵塞和土工布侵入除外），某些产品中无需明确考虑额外的折减系数。

1.1 This guide presents a guideline specifying a drainage geocomposite product; it specifically provides recommendations to determine the allowable flow rate of a candidate drainage geocomposite. The resulting value is then compared to a required (or design) flow rate for a product-specific and site-specific factor of safety. 1.2 This guide is intended to aid designers, purchasers, installers, contractors, owners, operators, and agencies in establishing minimum guidelines for drainage geocomposite materials. This guide is not to be used for manufacturer’s quality control purposes, nor is it a construction quality assurance specification. 1.3 This guide does not address the required (or design) flow rate value, nor the subsequent factor of safety values, which are typically design specific. 1.4 The procedures recommended in this guide use ASTM test methods. 1.5 This guide is applicable to all types of drainage geocomposites regardless of their core configuration or geotextile type. It can also be used to evaluate thick, nonwoven geotextiles that provide drainage. 1.6 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. 1.7 This guide offers an organized collection of information or a series of options and does not recommend a specific course of action. This guide cannot replace education or experience and should be used in conjunction with professional judgment. Not all aspects of this guide may be applicable in all circumstances. This guide is not intended to represent or replace the standard of care by which the adequacy of a given professional service must be judged, nor should this guide be applied without consideration of a project’s many unique aspects. The word ‘standard’ in the title of this guide means only that the guide has been approved through the ASTM International consensus process. 1.8 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. 1.9 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 This guide is intended to aid designers, purchasers, installers, contractors, owners, operators, and agencies in establishing the minimum criteria to specify drainage geocomposites. Specifically, this guide presents a methodology for determining the allowable flow rate of a candidate drainage geocomposite. The resulting value is then compared to a required (or design) flow rate for a product-specific and site-specific factor of safety. 4.2 It is recognized that there are other products that may achieve the same performance requirements but are not listed in this document. Manufacturers of such products are invited to implement this standard guide with the appropriate information. 4.3 It should be recognized that parties, organizations, or representatives may perform additional tests other than those required in this guide. In this case, the more stringent project-specific tests will then take precedence. 4.4 By simulating site-specific conditions (inclusive of site-specific liquids and temperatures except for load duration beyond 100 h, chemical/biological clogging, and geotextile intrusion), additional reduction factors need not be explicitly accounted for in certain products.