文档介绍：Designation: D 2487-00
Standard Practice for
Classification of Soils for Engineering Purposes (Unified Soil Classification System)1
土的工程分类执行标准(统一的土分类体系)
This standard is issued under (he fixed designation D 2487; the number immediately following the designation indicates (he year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last rcapproval. A superscript epsilon (c) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
范围
、液限和塑性指数用于工程目的分类矿物和有机金属矿物土的体系，当需要精确分类土时，这些将会用到。
Note 1 sc of this standard will result in a single classification group symbol and group name except when a soil contains 5 to 12 % fines or when the plot of the liquid limit and plasticity index values falls into the crosshatched area of the plasticity chart. In these two cases9 a dual symbol is used, for example, GP-GM, CL-ML. When the laboratory test results indicate that the soil is close to another soil classification group, the borderline condition can be indicated with two symbols sejjarated by a slash. The first symbol should be the one based on this standard, for example, CL/CH, GM/SM, SC/CL. Horderline symbols arc particularly useful when the liquid limit value of clayey soils is close to 50. These soils can have expansive characteristics and the use of a borderline symbol (CL/CH, CH/CL.) will alert the user of tBe assigned classifications of expansive potential.
-in.(75-mm)筛部分试样上的测试完成的数据(见规范Ell)o
，该标准仅限于自然生成的土。
Note 2 The group names and symbols used in this test method may
be used as a descriptive system applied to such materials as shale, claystone, shells, crushed rock, etc. See Appendix X2.
。
Note 3—When quantitative information is required for detailed designs of important structures, this test method must be supplemented by labora