1.1 本试验方法可用于使用岩心置换法测定表土和混合土壤生长介质的原状（原位）就地容重、含水量和单位重量。 1.2 本试验方法适用于岩石或粗材料含量不超过1英寸的土壤。此外，它仅适用于土壤中的自然孔隙或孔隙小到足以防止试验中使用的砂进入孔隙并影响试验结果的土壤。与试验方法不同 D1556 ，该试验方法适用于有机和塑性土壤，因为使用了芯样装置，而不是手动开挖方法。材料应具有足够的粘性材料或颗粒吸引力，以在试验期间提供稳定的芯（芯孔），而不会变形或脱落。因此，该方法不适用于无法保持稳定边的松散颗粒土。 与试验方法不同，本试验方法适用于使用土壤小芯评估表层土（或混合土）的压实度 D4914 ，使用大体积土坑开挖。 1.3 本试验方法适用于适合运动场、高尔夫球场和草坪区域的典型生长介质土壤，其中可能包括有机材料、淤泥、粘土和沙子。 1.4 本试验方法不适用于根质量过大或根质量包括木质根的土壤条件。 1.5 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。 1.6 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 本试验方法可用于在种植前或在制定天然草坪运动场、种植区、草坪和高尔夫球场的维护计划时确定表层土和混合土的就地密度。 5.2 这种测试方法可以为建设者和维护人员提供草坪生长介质密度的快速评估，而不会延迟正式的实验室测试程序。在施工期间以及播种或铺草皮之前，有一种量化现场土壤密度的方法将有助于建筑商在种植时提供适当的土壤密度，从而改善整个草坪的建立。 5.3 本试验方法的使用通常仅限于非饱和条件下的土壤。对于松软或易碎（易破碎）的土壤，或在水分条件下导致水渗入人工开挖孔的土壤，不建议使用本试验方法。 该测试的准确性可能会受到石头或其他材料的影响，这些石头或材料可能会在测试芯的侧壁或底部形成凹槽或松散材料。受车辆行驶影响区域内的测试核心位置可能会导致更高的密度，应在报告中注明这些位置。

1.1 This test method may be used to determine the undisturbed (in-situ) in-place bulk-density, moisture content and unit weight of topsoil and blended soil growing mediums using the Core Displacement Method. 1.2 This test method is applicable for soils without appreciable amounts of rock or coarse material exceeding 1 inch in size. Further it is only suitable for soils in-which the natural void or pore openings in the soil are small enough to prevent the sand used in the test from entering the voids and impacting the test results. Unlike Test Method D1556 , this test method is suitable for organic and plastic soils due to the use of a core apparatus, and not hand excavation methods. The material shall have adequate cohesive material or particle attraction to provide a stable core (core hole) for the duration of the test without deforming or sloughing. Therefore this method is not suitable for unbound granular soils that cannot maintain stable sides. This test method is applicable for assessing compaction of surface layers of topsoil (or blended soils) using a soil small core unlike Test Methods D4914 , which uses a large volume soil pit excavation. 1.3 This test method is intended for soil typical of growing mediums suitable for sports fields, golf courses and lawn areas that may include organic material, silts, clays and sand. 1.4 This test method is not applicable for soil conditions in-which the root mass is excessive or in-which the root mass includes woody roots. 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 This test method can be used to determine in-place density of topsoil and blended soils prior to planting or in the development of a maintenance programs for natural turf sports fields, planting areas, lawns and golf courses. 5.2 This test method can provide builders and maintenance staff with a quick assessment of the turf growing medium density without the delays associated with formal lab testing programs. During construction and prior to seeding or sodding having a method to quantify in-place soil density will assist the builder in providing an appropriate soil density at the time of planting thus improving overall turf establishment. 5.3 The use of this test method is generally limited to soil in an unsaturated condition. This test method is not recommended for soils that are soft or friable (crumble easily) or in a moisture condition such that water seeps into the hand excavated hole. The accuracy of this test can be affected by stones or other material that can create grooves or loose material along the side walls or bottom of the test core. Test core locations within areas subject to vehicle travel may result in higher densities and such locations should be noted in the report.