1.1 本试验方法包括用8 kg[17.6 lb]锤（8 kg[117.6 lb]DCP）通过原状土或压实材料，或两者兼有，测量动态圆锥贯入仪的贯入率。渗透率可能与 就地 强度，例如 就地 加州承载比。可以估计土壤密度( 注1 )如果土壤类型和含水量已知。本试验方法中描述的DCP通常用于路面应用。 1.2 当使用8 kg[17.6 lb]的滑动块在软土条件下产生过大的穿透力时，试验方法提供了一个可选的4.6 kg[10.1 lb]的滑锤。 1.3 单位-- 以国际单位制或英寸磅单位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。将两个系统的值结合起来可能会导致不符合标准。 1.4 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。 1.5 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 此测试方法用于评估 就地 原状土和压实材料（或两者）的强度。8 kg[17.6 lb]DCP的穿透率可用于估算 就地 加州承载比（CBR），用于确定地层厚度、地层抗剪强度和其他材料特性。 5.1.1 对于具有不同锤重和锥尖尺寸的DCP，存在其他测试方法，这些方法具有仪器特有的相关性，例如测试方法 D7380/D7380米 。 5.2 8 kg[17.6 lb]DCP是垂直放置的，因此通常用于水平施工应用，如人行道和楼板。 5.3 该仪器通常用于评估1000 mm[39 in。 ]表面以下。使用传动杆延长件可以增加穿透深度。然而，如果使用驱动杆延伸，在使用相关性来估计其他参数时应小心，因为这些相关性仅适用于特定的DCP配置。装置的质量和惯性将发生变化，并且将发生沿驱动杆延伸部的皮肤摩擦。 5.4 8 kg[17.6 lb]DCP可用于估算细粒和粗粒土壤、颗粒建筑材料以及弱稳定或改性材料的强度特性。8 kg[17.6 lb]DCP不能用于高度稳定或胶结的材料，也不能用于含有大于50 mm[2 in.]的大量骨料的颗粒材料。 5.5 8 kg[17.6 lb]DCP可用于估算 就地 通过首先钻探或取芯进入孔，在粘结层或高度稳定层下方的材料。 注1: DCP可用于通过将密度与相同材料上的穿透率相关联来评估相当均匀的材料的密度。通过这种方式，即使DCP不直接测量密度，也可以识别出压实不足或“软”点。 3. 5.6 现场DCP测量在现场或 就地 CBR，通常不会与相同材料的实验室或浸泡CBR相关。因此，该测试旨在评估 就地 材料在现有现场条件下的强度。

1.1 This test method covers the measurement of the penetration rate of the dynamic cone penetrometer with an 8 kg [17.6 lb] hammer (8 kg [17.6 lb] DCP) through undisturbed soil or compacted materials, or both. The penetration rate may be related to in situ strength such as an estimated in situ CBR (California Bearing Ratio). A soil density may be estimated ( Note 1 ) if the soil type and moisture content are known. The DCP described in this test method is typically used for pavement applications. 1.2 The test method provides for an optional 4.6 kg [10.1 lb] sliding hammer when the use of the 8 kg [17.6 lb] sliding mass produces excessive penetration in soft ground conditions. 1.3 Units— The values stated in either SI units or inch-pound 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. 1.4 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. 1.5 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 is used to assess in situ strength of undisturbed soil and compacted materials (or both). The penetration rate of the 8 kg [17.6 lb] DCP can be used to estimate in situ CBR (California Bearing Ratio), to identify strata thickness, shear strength of strata, and other material characteristics. 5.1.1 Other test methods exist for DCPs with different hammer weights and cone tip sizes, which have correlations that are unique to the instrument, such as Test Method D7380/D7380M . 5.2 The 8 kg [17.6 lb] DCP is held vertically, and therefore is typically used in horizontal construction applications, such as pavements and floor slabs. 5.3 This instrument is typically used to assess material properties down to a depth of 1000 mm [39 in.] below the surface. The penetration depth can be increased using drive rod extensions. However, if drive rod extensions are used, care should be taken when using correlations to estimate other parameters, since these correlations are only appropriate for specific DCP configurations. The mass and inertia of the device will change and skin friction along drive rod extensions will occur. 5.4 The 8 kg [17.6 lb] DCP can be used to estimate the strength characteristics of fine and coarse-grained soils, granular construction materials, and weak stabilized or modified materials. The 8 kg [17.6 lb] DCP cannot be used in highly stabilized or cemented materials or for granular materials containing a large percentage of aggregates greater than 50 mm [2 in.]. 5.5 The 8 kg [17.6 lb] DCP can be used to estimate the strength of in situ materials underlying a bound or highly stabilized layer by first drilling or coring an access hole. Note 1: The DCP may be used to assess the density of a fairly uniform material by relating density to penetration rate on the same material. In this way, undercompacted or “soft” spots can be identified, even though the DCP does not measure density directly. 3 5.6 A field DCP measurement results in a field or in situ CBR and will not normally correlate with the laboratory or soaked CBR of the same material. The test is thus intended to evaluate the in situ strength of a material under existing field conditions.