陕南膨胀土判别与分类的模糊综合评判

THE SYNTHETICAL FUZZY JUDGING TO CLASSIFYING AND DETERMINING EXPANSIVE SOIL IN THE SOUTH OF SHAANXI

用模糊数学方法,选用与膨胀土胀缩特性有关的指标:粘粒含量(m_(0.005))、液限(W_L)、液性指数(I_L)、线缩率(e_u)、自由膨胀率(δ_(ef)),对陕南地区膨胀土进行了模糊综合评判。其结果可分为3类:一类是灰白、灰绿色强膨胀潜势膨胀土;二类是三级以上阶地上黄褐-棕红色的中等膨胀潜势的膨胀土;三类是二级阶地上褐黄-黄褐色弱膨胀潜势的膨胀土。

The mathematical method of 'Fuzzy'is used in this paper. We choose some indexes which include content nof clay fraction liquid limit and liquidity indexes , and linear shri kage and free swell ratios related to swell -shrinking properties of expansive soil. The result shows that expansive soil in the south of Shaanxi can be divided into three types according to synthetical fuzzy judging. The first type is powerful swelling potential with greyish-white or yellowish-green color. The second type is medium swelling potential with yellowish-brown color on grade-3 terrace and highhill. The third type is inferior swelling potential with yellowishbrown color on grade-2 terrace.