当粘土中有机质含量超过5%以及砂土中有机质含量超过3%时，则称为含有机质土。有机质土呈深褐色或黑色，含水量较高，压缩性损大且不均匀，往往以夹层构造形式存在于一般粘性土层中。
...学报（自然科学版、英文版） 关键字: 有机质土；腐植酸；最优掺入比；极限渗透系数；预测模型[gap=1596]Key words: organic soil; humic acid; optimal mixing ratio; ultimate permeability coefficient; forecasti..
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最后，给出有机质土的液塑限关系推导公式。
At last, a formula presenting the relation of liquid plastic limit of organic soil is derived.
试验结果表明，人工有机质土的液限以指数形式增长，塑限则呈线性形式增加；
Test results indicated that the liquid limit of artificial organic soil increased exponentially, whose plastic limit increased of linearly with the humic acid content;
摘要：软土路基主要由粘土和粉土等细微颗粒含量多的松软土、空隙大的有机质土、泥炭土以及松散砂等土层构成。
Abstract: : the soft soil roadbed is mainly composed of clay and silty soil fine particle content of soft soil, the gap of the organic soil, peat soil and loose sand soil layer.
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