1.1 本试验方法用于评估侵蚀控制产品（ECP）使用可调倾斜床坡度保护边坡免受降雨侵蚀的能力。标准坡度范围为2:1至4:1（H:V），目标降雨强度为3.5英寸/h[90毫米/小时]。 1.2 ECP必须具备三个主要功能:1。吸收雨滴的冲击力，从而通过“飞溅”机制减少土壤颗粒的松动和脱落；2、减缓径流并鼓励入渗，从而减少土壤颗粒通过“地表流”机制的位移和运输； 和3。在ECP下方截留土壤颗粒。在比较所考虑的不同ECP的数据时，重要的是保持所评估ECP的测试条件相同，例如降雨强度率和斜率。 1.3 该测试方法的结果可用于评估性能和可接受性，并可用于比较不同ECP的有效性。该方法提供了ECP与受控和记录条件下基线裸土条件的比较评估。 该测试方法可以提供有关当前不存在性能信息的特定应用中正在考虑的产品的信息。 1.4 本试验方法涵盖三种不同土壤类型的使用、ECP安装:喷涂、碾压或干施以及径流收集程序。该试验通常在室内进行，但只要满足某些要求，也可以在室外进行。只要满足环境条件，部分封闭的设施是可以接受的。 1.5 单位- 以英寸-磅单位或国际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。以英寸磅以外的单位报告试验结果不应视为不符合本标准。 1.5.1 在处理英寸时，使用英寸-磅单位的重力系统- 磅单位。在该系统中，磅（lbf）表示力（重量）的单位，而质量的单位是段塞。除非涉及动态（F=ma）计算，否则未给出缓动单元。 1.5.2 工程/建筑行业的常见做法是同时使用磅来表示质量单位（lbm）和力（lbf）。这种做法隐含地结合了两个独立的单位制；绝对系统和引力系统。科学上不希望同时使用两套独立的英寸- 单一标准内的磅单位。如前所述，本标准包括英寸-磅单位的重力系统，不使用/表示段塞质量单位。然而，使用天平和天平记录质量磅（lbm）或记录密度（lbm/ft） 3. 不应视为不符合本标准。 1.5.3 仅使用一组单元进行计算；重力英寸磅或SI。允许使用其他单位，前提是在整个计算过程中使用适当的转换因子来保持单位的一致性，并保持类似的有效数字或分辨率，或两者都保持。 1.6 所有观察值和计算值应符合实践中确定的有效数字和舍入准则 D6026 ，除非被本试验方法取代。 1.6.1 用于规定如何在标准中收集/记录和计算数据的程序被视为行业标准。此外，它们代表了通常应保留的有效数字。使用的程序不考虑材料变化、获取数据的目的、特殊目的研究或用户目标的任何考虑因素； 通常的做法是增加或减少报告数据的有效位数，以与这些考虑因素相称。考虑工程数据分析方法中使用的有效数字超出了这些测试方法的范围。 1.7 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。 1.8 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 该测试方法利用了过去30年在各种测试实验室建立的大型测试设备和程序。 5.2 该方法有助于评估ECP及其安装，以减少暴露在规定降雨条件下的土壤流失和泥沙浓度，并通过减少悬浮固体和浊度改善受土方工程活动干扰区域的水质。 5.3 该测试方法是一种性能测试，但也可用于验收测试，以确定产品是否符合项目规范。对于项目特定合规性，应考虑独特的项目特定条件。建议谨慎，因为目前有关实验室特定精度的信息不完整，土壤和其他环境和岩土条件的差异可能会影响ECP性能。 5.4 本标准也可用作评估不同ECP侵蚀控制特性的比较工具，也可用于获得机构批准。 注1: 本标准产生的结果的质量取决于执行该标准的人员的能力，以及所用设备和设施的适用性。符合实践标准的机构 D3740 通常认为能够胜任和客观的测试/采样/检查等。本标准的用户应注意遵守惯例 D3740 本身并不能保证可靠的结果。可靠的结果取决于许多因素；实践 D3740 提供了一种评估其中一些因素的方法。

1.1 This test method is used to evaluate the ability of erosion control products (ECP) to protect slopes from rainfall-induced erosion using an adjustable tilting bed slope. The standard slopes range from 2:1 to 4:1 (H:V) having a target rainfall intensity of 3.5 in./h [90 mm/h]. 1.2 There are three main elements the ECPs must have the ability to perform: 1. Absorb the impact force of raindrops, thereby reducing soil particle loosening and detachment through “splash” mechanisms; 2. Slow runoff and encourage infiltration, thereby reducing soil particle displacement and transport through “overland flow” mechanisms; and 3. Trap soil particles beneath the ECP. When comparing data from different ECPs under consideration, it is important to keep the test conditions the same for the ECPs being evaluated, for example, the rainfall intensity rate and the slope. 1.3 The results of this test method can be used to evaluate performance and acceptability, and can be used to compare the effectiveness of different ECPs. This method provides a comparative evaluation of an ECP to baseline bare soil conditions under controlled and documented conditions. This test method can provide information about a product that is under consideration for a specific application where no performance information currently exists. 1.4 This test method covers the use of three different soil types, ECP installation: sprayed, rolled, or dry applied, and a runoff collection procedure. This test is typically performed indoors, but may be performed outside as long as certain requirements are met. Partially enclosed facilities are acceptable providing the environmental conditions are met. 1.5 Units— The values stated in either inch-pound units or SI 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. Reporting of test results in units other than inch-pound shall not be regarded as nonconformance with this standard. 1.5.1 The gravitational system of inch-pound units is used when dealing with inch-pound units. In the system, the pound (lbf) represents a unit of force (weight), while the units for mass is slugs. The slug unit is not given, unless dynamic (F = ma) calculations are involved. 1.5.2 It is common practice in the engineering/construction profession to concurrently use pounds to represent both a unit of mass (lbm) and of force (lbf). This practice implicitly combines two separate systems of units; the absolute and the gravitational systems. It is scientifically undesirable to combine the use of two separate sets of inch-pound units within a single standard. As stated, this standard includes the gravitational system of inch-pound units and does not use/present the slug unit of mass. However, the use of balances and scales recording pounds of mass (lbm) or recording density in lbm/ft 3 shall not be regarded as nonconformance with this standard. 1.5.3 Calculations are done using only one set of units; either gravitational inch-pound or SI. Other units are permissible provided appropriate conversion factors are used to maintain consistency of units throughout the calculations, and similar significant digits or resolution, or both are maintained. 1.6 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026 , unless superseded by this test method. 1.6.1 The procedures used to specify how data are collected/recorded and calculated in the standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user’s objectives; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of these test methods to consider significant digits used in analysis methods for engineering data. 1.7 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. 1.8 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 utilizes large-scale testing equipment and procedures established at a variety of testing laboratories over the last 30 years. 5.2 This method is useful in evaluating ECPs and their installation to reduce soil loss and sediment concentrations when exposed to defined rainfall conditions and improving water quality exiting the area disturbed by earthwork activity by reducing suspended solids and turbidity. 5.3 This test method is a performance test, but can also be used for acceptance testing to determine product conformance to project specifications. For project-specific conformance, unique project-specific conditions should be considered. Caution is advised since information regarding laboratory specific precision is incomplete at this time, and differences in soil and other environmental and geotechnical conditions may affect ECP performance. 5.4 This standard can also be used as a comparative tool for evaluating the erosion control characteristics of different ECPs and can also be used to gain agency approvals. Note 1: The quality of the result produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with Practice D3740 does not in itself assure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors.