1.1本试验方法描述了通常称为标准贯入试验（SPT）的程序，该程序用于驱动分筒取样器，以获得代表性扰动土壤样品，用于识别目的，并测量土壤对取样器贯入的阻力。另一种方法（试验方法D 3550 )可以驱动分筒取样器以获得代表性土壤样本，但锤击能量未标准化。 1.2实施规程D 6066 给出了确定砂土归一化贯入阻力的指南，用于将N值调整到恒定能量水平，以评估液化潜力。 1.3测试结果和识别信息用于估计基础设计的地下条件。 1.4渗透阻力测试通常在5- 除非另有规定，否则在钻孔过程中观察到足部深度间隔或材料发生重大变化时。 1.5本试验方法仅限于在非岩化土壤和最大粒径约小于取样器直径一半的土壤中使用。 1.6本试验方法涉及使用旋转钻孔设备（指南D 5783） ，规程D 6151 ). 其他钻孔和取样程序（指南D 6286 ，指南D 6169 )是可用的，可能更合适。未考虑无钻孔的手动或浅层采样。应根据规程D 5434记录地下调查 . 样品应按照规程D 4220进行保存和运输 使用B组。土壤样本应根据实施规程D 2488通过组名和符号进行识别 . 1.7所有观察值和计算值应符合实施规程D 6026中建立的有效数字和舍入准则 ，除非被本试验方法取代。 1.8除非下文另有说明，否则以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.8.1在处理英寸磅单位时，使用英寸磅单位的重力系统。在这个系统中，磅（lbf）表示力（重量）的单位，而质量的单位是段塞。 1.9渗透阻力测量通常涉及安全规划、管理和文件。本试验方法并非旨在解决勘探和现场安全的所有方面。 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和健康实践，并确定监管限制的适用性。 测试的执行通常涉及使用钻机；因此，必须遵守适用安全标准中概述的安全要求（例如，OSHA法规、NDA钻井安全指南、钻井安全手册以及其他适用的州和地方法规）。 ====意义和用途====== 本试验方法提供扰动土壤样本，用于确定含水量、进行识别和分类（实施规程D 2487） 和D 2488 )以及适用于从采样器中获得的土壤的实验室试验，该采样器将在样品中产生较大的剪切应变扰动，例如试验方法D 854 ，D 2216 ，和D 6913 . 含有砾石、鹅卵石或巨砾的土壤沉积物通常会导致贯入阻力和设备损坏。 本试验方法提供了扰动土壤样本，用于含水量测定和实验室鉴定。样品质量通常不适用于工程特性的高级实验室测试。采样器的驱动过程将引起土壤扰动，并改变工程特性。薄壁管取样器的使用（实施规程D 1587 )可能会减少软土中的扰动。对于较硬的土壤，取芯技术可能会比SPT采样产生更少的干扰，但情况并非总是如此，即在取芯过程中，一些胶结土壤可能会因水的作用而变得松散；见规程D 6151 ，和指南D 6169 . 该测试方法广泛用于各种岩土工程勘探项目。许多局部相关性和广泛发布的与击数相关的相关性，或 N -价值，以及土方工程和基础的工程行为。为了评估地震期间砂土的液化潜力，应采用 N -该值应标准化为标准上覆岩层应力水平。规程D 6066 提供获得砂土对标准能量驱动的标准采样器穿透的归一化阻力记录的方法。通过使用具有估计能量传递的锤系统或使用测试方法D 4633直接测量钻杆应力波能量，将穿透阻力调整为钻杆能量比60% . 笔记 1-本规程产生的数据和解释的可靠性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D 3740标准的机构 通常认为能够进行合格测试。本规程的使用者应注意遵守规程D 3740 不能保证可靠的测试。可靠的测试取决于几个因素和实践D 3740 提供了一种评估其中一些因素的方法。实践D 3740 是为从事土壤和岩石测试、检验或两者兼有的机构开发的。因此，它并不完全适用于执行这种做法的机构。本试验方法的使用者应认识到实施规程D 3740的框架 适用于评估执行本试验方法的机构的质量。目前，没有已知的合格国家机构对执行该试验方法的机构进行检查。

1.1 This test method describes the procedure, generally known as the Standard Penetration Test (SPT), for driving a split-barrel sampler to obtain a representative disturbed soil sample for identification purposes, and measure the resistance of the soil to penetration of the sampler. Another method (Test Method D 3550 ) to drive a split-barrel sampler to obtain a representative soil sample is available but the hammer energy is not standardized. 1.2 Practice D 6066 gives a guide to determining the normalized penetration resistance of sands for energy adjustments of N-value to a constant energy level for evaluating liquefaction potential. 1.3 Test results and identification information are used to estimate subsurface conditions for foundation design. 1.4 Penetration resistance testing is typically performed at 5-foot depth intervals or when a significant change of materials is observed during drilling, unless otherwise specified. 1.5 This test method is limited to use in nonlithified soils and soils whose maximum particle size is approximately less than one-half of the sampler diameter. 1.6 This test method involves use of rotary drilling equipment (Guide D 5783 , Practice D 6151 ). Other drilling and sampling procedures (Guide D 6286 , Guide D 6169 ) are available and may be more appropriate. Considerations for hand driving or shallow sampling without boreholes are not addressed. Subsurface investigations should be recorded in accordance with Practice D 5434 . Samples should be preserved and transported in accordance with Practice D 4220 using Group B. Soil samples should be identified by group name and symbol in accordance with Practice D 2488 . 1.7 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D 6026 , unless superseded by this test method. 1.8 The values stated in inch-pound units are to be regarded as standard, except as noted below. The values given in parentheses are mathematical conversions to SI units, which are provided for information only and are not considered standard. 1.8.1 The gravitational system of inch-pound units is used when dealing with inch-pound units. In this system, the pound (lbf) represents a unit of force (weight), while the unit for mass is slugs. 1.9 Penetration resistance measurements often will involve safety planning, administration, and documentation. This test method does not purport to address all aspects of exploration and site safety. 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 and health practices and determine the applicability of regulatory limitations prior to use. Performance of the test usually involves use of a drill rig; therefore, safety requirements as outlined in applicable safety standards (for example, OSHA regulations, NDA Drilling Safety Guide, drilling safety manuals, and other applicable state and local regulations) must be observed. ====== Significance And Use ====== This test method provides a disturbed soil sample for moisture content determination, for identification and classification (Practices D 2487 and D 2488 ) purposes, and for laboratory tests appropriate for soil obtained from a sampler that will produce large shear strain disturbance in the sample such as Test Methods D 854 , D 2216 , and D 6913 . Soil deposits containing gravels, cobbles, or boulders typically result in penetration refusal and damage to the equipment. This test method provides a disturbed soil sample for moisture content determination and laboratory identification. Sample quality is generally not suitable for advanced laboratory testing for engineering properties. The process of driving the sampler will cause disturbance of the soil and change the engineering properties. Use of the thin wall tube sampler (Practice D 1587 ) may result in less disturbance in soft soils. Coring techniques may result in less disturbance than SPT sampling for harder soils, but it is not always the case, that is, some cemented soils may become loosened by water action during coring; see Practice D 6151 , and Guide D 6169 . This test method is used extensively in a great variety of geotechnical exploration projects. Many local correlations and widely published correlations which relate blow count, or N -value, and the engineering behavior of earthworks and foundations are available. For evaluating the liquefaction potential of sands during an earthquake event, the N -value should be normalized to a standard overburden stress level. Practice D 6066 provides methods to obtain a record of normalized resistance of sands to the penetration of a standard sampler driven by a standard energy. The penetration resistance is adjusted to drill rod energy ratio of 60 % by using a hammer system with either an estimated energy delivery or directly measuring drill rod stress wave energy using Test Method D 4633 . Note 1—The reliability of data and interpretations generated by this practice 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 D 3740 generally are considered capable of competent testing. Users of this practice are cautioned that compliance with Practice D 3740 does not assure reliable testing. Reliable testing depends on several factors and Practice D 3740 provides a means of evaluating some of these factors. Practice D 3740 was developed for agencies engaged in the testing, inspection, or both, of soils and rock. As such, it is not totally applicable to agencies performing this practice. Users of this test method should recognize that the framework of Practice D 3740 is appropriate for evaluating the quality of an agency performing this test method. Currently, there is no known qualifying national authority that inspects agencies that perform this test method.