三类土

外源砷、铅在三类紫色土中形态分配与其化学、生物有效性研究

Speciation distribution and its chemical , biological availability of arsenic , lead added in acid , neutral and alkali purple soil

计算结果表明，三类特殊土的分维界于2～3之间，且红土的分维大于膨胀土，黄土最小。

Results show that the D of regional soils changes from 2 to 3 , and the D of laterite is the largest and loess is the lowest .

水分特征曲线的分形模型可以分为三类：土颗粒分布的分形模型、土体孔隙表面的分形模型和土体孔隙分布的分形模型。

Fractal models for the soil-water characteristics were categorized into three groups : fractal model for soil mass distribution , fractal model for pore surface and fractal model for pore volume-size distribution .

对上海某地区三类软土的共振柱试验进行了分析研究，结果表明，三种土类的动剪切模量剪应变、阻尼比剪应变关系具有一定规律性。

Analysis of the cyclic triaxial test results of three kinds of soft soils in Shanghai shows that a certain regularity exists between the dynamic shear modulus and the shear strain , and between the damping ratio and the shear strain of the three kinds of soils .