1.1 本试验方法涵盖了确定摩擦锥或压电锥以稳定速率进入地下土壤时的阻力的程序。 1.2 本试验方法适用于电子摩擦锥，不包括液压、气动或自由落体锥，尽管本文中的许多程序要求可能适用于这些锥。此外，由于在这些环境（例如潮汐变化、盐水和波浪）中进行测试的困难，海上/海洋锥体贯入试验（CPT）系统可能存在程序差异。试验方法涵盖了使用机械式锥体的现场试验 D3441 . 1.3 当使用适当饱和的压电锥时，该试验方法可用于确定贯入过程中产生的孔隙水压力。推压后的孔隙水压力消散也可以监测与固结时间速率和渗透性的相关性。 1.4 附加传感器，如测斜仪、地震传感器（试验方法 D7400 )，电阻率、电导率、电介质和温度传感器，可包括在锥体中，以提供额外信息。建议使用测斜仪，因为它将提供测深过程中潜在破坏情况的信息。 1.5 锥体贯入度试验数据可用于解释地下地层，通过使用现场特定的相关性，它们可以提供用于土方工程和结构基础设计和施工的土壤工程特性数据。 1.6 单位- 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。以国际单位制以外的单位报告试验结果不应视为不符合本试验方法 1.7 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。 1.7.1 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。 1.8 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====== 5.1 使用该测试方法进行的测试提供了锥尖阻力的详细记录，这有助于评估现场地层、工程特性、均匀性和到坚固层的深度、空洞或空洞以及其他不连续性。使用摩擦套筒和孔隙水压力元件可以估计土壤分类，以及与土壤工程特性的相关性。当在合适的地点正确执行时，该测试提供了一种快速确定地下条件的方法。 5.2 本试验方法提供了用于估算土壤工程特性的数据，旨在帮助土方工程的设计和施工、结构基础以及土壤在静态和动态荷载下的行为。 5.3 该方法对土壤进行原位测试，测试期间未获得土壤样本。对该测试方法结果的解释提供了渗透土壤类型的估计。工程师可以从平行钻孔中获取土壤样本，以进行对比，但之前的信息或经验可能会排除进行钻孔的必要性。 注2: 本标准产生的结果质量取决于执行测试的人员的能力，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和实践 D3740 提供了一种评估其中一些因素的方法。

1.1 This test method covers the procedure for determining the resistance of a friction cone or a piezocone as it is advanced into subsurface soils at a steady rate. 1.2 This test method applies to electronic friction cones and does not include hydraulic, pneumatic, or free-fall cones, although many of the procedural requirements herein could apply to those cones. Also, offshore/marine Cone Penetration Testing (CPT) systems may have procedural differences because of the difficulties of testing in those environments (for example, tidal variations, salt water and waves). Field tests using mechanical-type cones are covered elsewhere by Test Method D3441 . 1.3 This test method can be used to determine pore water pressures developed during the penetration when using a properly saturated piezocone. Pore water pressure dissipation, after a push, can also be monitored for correlation to time rate of consolidation and permeability. 1.4 Additional sensors, such as inclinometer, seismic (Test Methods D7400 ), resistivity, electrical conductivity, dielectric, and temperature sensors, may be included in the cone to provide additional information. The use of an inclinometer is recommended since it will provide information on potentially damaging situations during the sounding process. 1.5 CPT data can be used to interpret subsurface stratigraphy, and through use of site specific correlations, they can provide data on engineering properties of soils intended for use in design and construction of earthworks and foundations for structures. 1.6 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. Reporting of test results in units other than SI shall not be regarded as nonconformance with this test method 1.7 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. 1.7.1 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. 1.8 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 ====== 5.1 Tests performed using this test method provide a detailed record of cone tip resistance, which is useful for evaluation of site stratigraphy, engineering properties, homogeneity and depth to firm layers, voids or cavities, and other discontinuities. The use of a friction sleeve and pore water pressure element can provide an estimate of soil classification, and correlations with engineering properties of soils. When properly performed at suitable sites, the test provides a rapid means for determining subsurface conditions. 5.2 This test method provides data used for estimating engineering properties of soil intended to help with the design and construction of earthworks, the foundations for structures, and the behavior of soils under static and dynamic loads. 5.3 This method tests the soil in situ and soil samples are not obtained during the test. The interpretation of the results from this test method provides estimates of the types of soil penetrated. Engineers may obtain soil samples from parallel borings for correlation purposes but prior information or experience may preclude the need for borings. Note 2: The quality of the results produced by this standard is dependent on the competence of the personal performing the test, 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 and Practice D3740 provides a means of evaluating some of those factors.