1.1 本试验方法包括通过驱动圆柱法测定地表附近土壤的原位密度。该测试方法涉及通过将薄壁圆柱体打入土壤中并进行特定的测量和计算来确定原地密度，从而获得完整的土壤样本。当需要确定深度处的就地密度时，规程 1587/1587米 或 D6519/D6519M 可以使用。 1.2 不建议对取样过程中可能压缩的有机或易碎土壤进行取样。本试验方法可能不适用于柔软、有机、高塑性、非粘性、饱和或其他在取样过程中容易变形、压缩或可能无法保留在驱动筒取样器中的土壤。 该试验可能不适用于非常坚硬的天然土壤或压实严重的土壤，这些土壤可能不容易被驱动气缸取样器穿透。在含有大量大于5mm颗粒的土壤中使用该试验方法( 3. / 16 in.）可能导致驱动缸设备损坏。含有大于5mm颗粒的土壤( 3. / 16 如果在驱动过程中沿圆柱体壁产生空隙，或者在修整过程中颗粒从样品端部脱落，则可能不会产生有效的结果。 1.3 本试验方法仅限于获得适用于确定某些土壤就地密度和含水量的试样所需的程序。选择获取完整样品的位置所需的程序、注意事项和要求，适用于实验室测试或以其他方式确定工程性能，超出了本测试方法的范围。 1.4 单位-- 以国际单位制表示的值应被视为标准值。SI单位后括号中给出的值仅供参考，不被视为标准值。以国际单位制以外的单位报告测试结果不应被视为不符合本标准。 1.4.1 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）和力单位（lbf）。这隐含地结合了两个独立的单位系统；即绝对系统和引力系统。从科学上讲，在一个标准中结合使用两套单独的英寸-磅单位是不可取的。在处理英寸时，本标准是使用重力单位制编写的- 英镑系统。在这个系统中，磅（lbf）代表力（重量）的单位。然而，使用天平或磅秤记录磅质量（lbm）或记录密度（lbm/ft） 3. 不应被视为不符合本标准。 1.5 所有观察值和计算值应符合《规程》中规定的有效数字和四舍五入的准则 D6026 ，除非被本标准取代。 1.5.1 本标准中用于规定如何收集/记录或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、特殊目的研究或对用户目标的任何考虑； 并且通常的做法是增加或减少报告数据的有效数字以与这些考虑相称。考虑设计分析方法中使用的有效数字超出了本标准的范围。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 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 该试验方法可用于确定不含大量大于5mm颗粒的土壤的原位密度( 3. / 16 in），并且可以保持在驱动缸中。该试验方法也可用于确定结构填料、公路路堤或土坝施工中使用的压实土壤的原位密度。当使用现场密度作为验收依据时，驱动缸体积必须尽可能大，大于850 cm 3. （0.030英尺 3. ). 4.2 该试验方法的一般原理已成功用于获得最大粒径为5mm的各种现场压实细粒土壤的样品( 3. / 16 in.）用于密度测定以外的目的，如工程性能测试。 注1: 本标准产生的结果的质量取决于执行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。可靠的结果取决于许多因素；实习 D3740 提供了一种评估其中一些（但不是全部）因素的方法。

1.1 This test method covers the determination of in-place density of soil near the surface by the drive-cylinder method. The test method involves obtaining an intact soil sample by driving a thin-walled cylinder into the soil and conducting specific measurements and calculations for the determination of in-place density. When determination of in-place density is required at depth, Practice D1587/D1587M or D6519/D6519M may be used. 1.2 This test method is not recommended for sampling organic or friable soils which may compress during sampling. This test method may not be applicable for soft, organic, highly plastic, noncohesive, saturated or other soils which are easily deformed, compress during sampling, or which may not be retained in the drive cylinder sampler. This test may not be applicable with very hard natural soils or heavily compacted soils that may not be easily penetrated with the drive cylinder sampler. The use of this test method in soils containing an appreciable amount of particles larger than 5 mm ( 3 / 16 in.) may result in damage to the drive cylinder equipment. Soils containing particles larger than 5 mm ( 3 / 16 in.) may not yield valid results if voids are created along the wall of the cylinder during driving, or if particles are dislodged from the sample ends during trimming. 1.3 This test method is limited to the procedures necessary for obtaining specimens suitable for determining the in-place density and water content of certain soils. The procedures, precautions, and requirements necessary for selecting locations for obtaining intact samples, suitable for laboratory testing or otherwise determining engineering properties, is beyond the scope of this test method. 1.4 Units— The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. Reporting of test results in units other than SI shall not be regarded as nonconformance with this standard. 1.4.1 It is common practice in the engineering/construction profession to concurrently use pounds to represent both a unit of mass (lbm) and a unit of force (lbf). This implicitly combines two separate systems of units; that is, the absolute system and the gravitational system. It is scientifically undesirable to combine the use of two separate sets of inch-pound units within a single standard. This standard has been written using the gravitational system of units when dealing with the inch-pound system. In this system, the pound (lbf) represents a unit of force (weight). However, the use of balances or scales recording pounds of mass (lbm) or the recording of density in lbm/ft 3 shall not be regarded as nonconformance with this standard. 1.5 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026 , unless superseded by this standard. 1.5.1 The procedures used to specify how data are collected/recorded or 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 standard to consider significant digits used in analysis methods for design. 1.6 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. 1.7 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 test method can be used to determine the in-place density of soils which do not contain significant amounts of particles larger than 5 mm ( 3 / 16 in.), and which can be retained in the drive cylinder. This test method may also be used to determine the in-place density of compacted soils used in construction of structural fill, highway embankments, or earth dams. When the in-place density is to be used as a basis for acceptance, the drive cylinder volumes must be as large as practical and greater than 850 cm 3 (0.030 ft 3 ). 4.2 The general principles of this test method have been successfully used to obtain samples of various field compacted fine-grained soils having a maximum particle size of 5 mm ( 3 / 16 in.) for purposes other than density determinations, such as testing for engineering properties. 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 facility used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing/sampling/inspection. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some, but not all, of those factors.