標準號：ASTM D2487-2000
中文標準名稱：施工用土壤的標準分類(統一標準土壤分類體系)
英文標準名稱：Standard Classification of Soils for Engineering Purposes (Unified Soil Classification System)
標準類型：P13
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：P13
國際標準分類號：93.020 (Earth works. Excavations. Foundation const
適用范圍： Note 1-Use 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 cases, 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 separated by a slash. The first symbol should be the one based on this standard, for example, CL/CH, GM/SM, SC/CL. Borderline symbols are 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 the assigned classifications of expansive potential.