ASTM D2487土分类流程图

粗粒土分类
砾石土 200号筛(0.075mm)通过率＜5%
通过200号筛(0.075mm)＜50%
留在4号筛(4.75mm)＞50%
Cu≥4且1≤Cc＜3 级配良好砾石GW 砂含量＜15% 砂含量≥15% Well-graded gravel with sand Well-graded gravel 级配优良含砂砾石 级配优良砾石 200号筛(0.075mm)通过率在5-12%之间
留在0.075mm筛含量≥30% 砂子含量≥砾石含量 砾石含量＜15% Sandy elastic silt 砂质塑性粉土 砾石含量≥15% Sandy elastic silt with gravel 含砾石砂质塑性粉土 砂子含量＜砾石含量 砂子含量＜15% Gravelly elastic silt 多砾石塑性粉土 砂子含量≥15% Gravelly elastic silt with sand 含砂多砾石塑性粉土
Cu＜4并且或者1≤Cc＜1 or Cc＞3 级配不良砾石GP 砂含量＜15% Poorly-graded gravel 级配不良砾石
Cu≥4且1≤Cc＜3 液塑限=ML or MH GW-GM 砂含量＜15% 砂含量≥15% Well-graded gravel with silt 级配优良含粉土砾石 液塑限=CL or CH (or CL-ML) GW-GC 砂含量＜15%
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留在0.075mm筛含量≥30% 砂子含量≥砾石含量 砾石含量＜15% Sandy silty clay 多砂粉质黏土 砾石含量≥15% 砂子含量＜砾石含量 砂子含量＜15% 砂子含量≥15% Gracelly silty clay Sandy silty clay with gravel Gravelly silty clay with sand 含砾石砂质粉质黏土 多砾石粉质黏土 含砂多砾石粉质黏土
Well-graded gravel with Well-graded gravel with silt and sand clay (or silty clay) 级配优良含粉土和砂砾石 级配优良含黏土(或粉质黏 土)砾石
留在0.075mm筛含量≥30% 砂子含量≥砾石含量 砾石含量＜15% Sandy lean clay 砂质低塑性黏土 砾石含量≥15% Sandy lean clay with gravel 含砾石砂质低塑性黏土 砂子含量＜砾石含量 砂子含量＜15% Gravel lean clay 多砾石低塑性黏 土 砂子含量≥15% Gravel lean clay with sand 含砂多砾石低塑性黏 土
留在0.075mm筛含量≥30% 砂子含量≥砾石含量 砾石含量＜15% Sandy fat clay 砂质重黏土 砾石含量≥15% Sandy fat clay with gravel 含砾石砂质重黏土 砂子含量＜砾石含量 砂子含量＜15% Gravelly fat clay 多砾石重黏土 砂子含量≥15% Gravelly fat clay with sand 含砂多砾石重黏土
细粒土分类
液限＜50% 无机土 PI＞7且处在A线及以上 CL低液限黏土
通过200号筛(0.075mm)≥50%
留在0.075mm筛含量＜30% 留在0.075mm筛含量＜15% Lean clay低塑性黏土 15%≤留在0.075mm筛上≤30% 砂子含量≥砾石含量 Lean clay with sand 含砂低塑性黏土 4≤PI≤7且处在A线及以上 CL-ML 留在0.075mm筛含量＜30% 留在0.075mm筛含量＜15% Silty clay 粉质黏土 15%≤留在0.075mm筛上≤30% 砂子含量≥砾石含量 Silty clay with sand 含砂粉质黏土 PI＜4或处在A线以下 ML 留在0.075mm筛含量＜30% 留在0.075mm筛含量＜15% Silt 粉土 液限≥50% 无机土 PI处在A线及以上 CH 重黏土 留在0.075mm筛含量＜30% 留在0.075mm筛含量＜15% Fat clay 重黏土 15%≤留在0.075mm筛上≤30% 砂子含量≥砾石含量 Fat clay with sand 含砂重黏土 PI处在A线及以下 MH 塑性粉土 留在0.075mm筛含量＜30% 留在0.075mm筛含量＜15% Elastic silt 塑性粉土 15%≤留在0.075mm筛上≤30% 砂子含量≥砾石含量 Elastic silt with sand 含砂塑性粉土 砂子含量＜砾石含量 Elastic silt with gravel 含砾石塑性粉土 砂子含量＜砾石含量 Fat clay with gravel 含砾石重黏土 15%≤留在0.075mm筛上≤30% 砂子含量≥砾石含量 Silt with sand 含砂粉土 砂子含量＜砾石含量 Silt with gravel 含砾石粉土 砂子含量＜砾石含量 Silty clay with gravel 含砾石粉质黏土 砂子含量＜砾石含量 Lean clay with gravel 含砾低塑性黏土
c＞3
液塑限=CL or CH (or CL-ML) GW-GC 砂含量≥15% Poorly-graded gravel with clay and sand(or silty clay and sand) 级配不良含黏土和砂 (或粉质粘土和砂)砾 石
并且或者1≤Cc＜1 or Cc＞3 级配不良砾石GP 砂含量≥15% Poorly-graded gravel with sand 级配不良含砂砾石
Cu＜4并且或者1≤Cc＜1 or Cc＞3 液塑限=CL or CH 液塑限=CL or CH (or CL-ML) 液塑限=ML or MH (or CL-ML) GW-GC GW-GM GW-GC 砂含量≥15% 砂含量＜15% 砂含量≥15% 砂含量＜15% Well-graded gravel with Poorly-graded Poorly-graded gravel clay and sand(or silty Poorly-graded gravel with gravel with silt with clay (or silty clay and sand) and sand silt clay) 级配优良含黏土和砂(或 级配不良含粉土砾石 级配不良含粉土 级配不良含黏土(或粉 粉质粘土和砂)砾石 和砂砾石 质黏土)砾石
留在0.075mm筛含量≥30% 砂子含量≥砾石含量 砾石含量＜15% Sandy silt 砂质粉土 砾石含量≥15% Sandy silt with gravel 含砾石砂质粉土 砂子含量＜砾石含量 砂子含量＜15% Gravelly silt 多砾石粉土 砂子含量≥15% Gravelly silt with sand 含砂多砾石粉土