1.1 本试验方法描述了使用手持式（袋装）叶片剪切装置近似粘性土的剪切强度。 1.2 该设备提供了一种简单便携的方法来测量饱和细粒粘性土壤的近似不排水抗剪强度。该试验方法可在现场或实验室、样品管末端、块状样品或挖掘物表面或其他具有刚性约束的试样表面上使用。 1.3 单位-- 以英寸磅单位或国际单位制（括号内给出）表示的数值应单独视为标准。每个系统中规定的值可能不是完全相等的；因此，每个系统应独立使用。将两个系统的值合并可能导致不符合标准。所述叶片的临界尺寸和公差表分别以英寸和毫米为单位提供。 注1: 最初的剪切叶片装置是在剪切强度通常以吨/平方英尺（TSF）或千克/平方厘米（kg/cm）为单位时开发的 2. )它们大致相等。这些单位在行业内占主导地位，并在本文中被采用。 1.4 所有观测值和计算值应符合实践中制定的有效数字和四舍五入指南 D6026 ，除非被本试验方法取代。 1.4.1 本标准中用于规定如何收集、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。所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。 考虑工程设计分析方法中使用的有效数字超出了本测试方法的范围。 1.5 本标准并不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。 1.6 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 手持式剪切叶片法提供了一种快速测量细骨料近似不排水剪切强度的方法- 现场或实验室中的细粒粘性土壤。本标准不补充或替代 D4648 . 5.2 该装置适用于饱和粘性土，用于测定其近似不排水抗剪强度。具有大量淤泥或细砂的粘性土壤在剪切过程中可能会经历一定程度的排水，并对结果产生不利影响。 注2: 用户可能在测试时不知道材料是否饱和。然而，这并不排除基于用户的知识和经验在不饱和的条件下使用该设备。 5.3 试验体积内存在的粗糙材料或非均质土壤将对结果产生不利影响，并可能妨碍使用该试验方法。 5.4 手持式剪切叶片试验不用于复制任何特定的现场条件，而是对整个调查程序的补充。 然而，在测试中使用了一致的物理参数，从而可以对剪切强度数据进行相关性，以评估沉积物的可变性，评估样品质量，帮助规划实验室测试程序，并对一致性进行分类。 注3: 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 通常被认为有能力进行合格和客观的测试/取样/检查等。本标准的用户应注意遵守实践 D3740 其本身不能保证可靠的结果。可靠的结果取决于许多因素；实践 D3740 提供了评估其中一些因素的方法。

1.1 This test method describes approximating the shear strength of cohesive soils using a handheld (pocket) vane shear device. 1.2 The device allows for a simple and portable method for measuring the approximate undrained shear strength of saturated, fine-grained, cohesive soils. The test method can be used in the field or in the laboratory, on the ends of sample tubes, on the surface of block samples or excavations, or on the surface of other test specimens with rigid confinement. 1.3 Units— The values stated in either inch-pound units or SI units [given in brackets] 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 non-conformance with the standard. Tables of critical dimensions and tolerances of the described vanes are provided in separate units of inches and mm. Note 1: The original shear vane device was developed when shear strength was often reported in tons per square foot (TSF) or kilograms per square centimeter (kg/cm 2 ) which are approximately equivalent. These units have prevailed within the industry and are adopted herein. 1.4 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. 1.4.1 The procedures used to specify how data are collected, recorded, and calculated in this 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 this test method to consider significant digits used in analysis methods for engineering design. 1.5 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. 1.6 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 handheld shear vane method provides a rapid method of measuring the approximate undrained shear strength of a fine-grained, cohesive soil either in the field or laboratory. This standard does not supplement or replace D4648 . 5.2 The device is intended for use in saturated cohesive soils for determining their approximate undrained shear strength. Cohesive soils with appreciable amounts of silt or fine sand may experience some degree of drainage during shear and adversely affect the results. Note 2: The user will probably not know at the time of testing if the material is saturated. However, that would not preclude using the device for less than saturated conditions based on the knowledge and experience of the user. 5.3 The presence of coarse materials or heterogeneous soils within the testing volume will adversely affect the results and may preclude the use of this test method. 5.4 The handheld shear vane test is not used to duplicate any particular field conditions but supplements the overall investigative program. However, consistent physical parameters are used in the test such that correlations of shear strength data can be made to evaluate variability of a deposit, assess sample quality, assist in planning of laboratory testing programs, and to classify the consistency. Note 3: 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.