中文摘要：

比表面积是黏性土重要的物理化学指标,选择合适的测试方法是正确获得这一参数的前提。采用亚甲基蓝（Methylene Blue）吸附法、乙二醇乙醚（Ethylene Glycol Monoethyl Ether）吸附法、甘油（Glycerin）吸附法以及风干含水率经验公式对5种黏土的比表面积进行试验测定及估算,试验结果表明：对于不含蒙脱石的土样,各种方法测试结果较为一致,偏差较小;但对于含蒙脱石的土样,EGME法的试验结果比其他方法偏小较多。通过X衍射对各种吸附液饱和后的蒙脱石土样进行试验后发现,风干状态下蒙脱石的晶层间距d_（001）=15.6？,而经EGME法、甘油法、MB法饱和后d_（001）分别变为15.9？,17.5？,19.0？,蒙脱石的晶层在甘油及MB饱和后扩展明显,便于吸附分子进入晶层内表面,因此分子覆盖效果更好。统计分析表明,土的比表面积反映了土中各亲水性黏土矿物组分及相对比例的综合影响,因此比表面积与液限、塑性指数及活性等物性指标具有相关性,可用幂函数形式来拟合,而黏粒含量不能反映黏土矿物类型对比表面积的影响,因此当统计试样的黏粒中同时含有膨胀性和非膨胀性矿物时,比表面积与黏粒含量相关性较差。

英文摘要：

The specific surface area（SSA） is an important physical and chemical indicator of clayey soils, and choosing the appropriate test method is the premise to obtain the correct parameters. The SSAs of 5 different clayey soils are determined by the following three methods： methylene blue（MB） method, ethylene glycol monoethyl ether（EGME） adsorption method, and glycerin adsorption method, and are estimated by the empirical formula, air-dried moisture content method. The experimental results show that, for the non-swelling clay, the SSA calculated by the above 4 methods are approximately the same, while for the soil samples containing montmorillonite, the SSAs measured by the EGME method are smaller than those by other methods. After montmorillonite soil samples are saturated with different adsorption solutions, the soil samples are analyzed through X-ray diffraction experiments. It is found that the spacing of air-dried montmorillonite crystal layer d_（001）=15.6 ？, while that saturated by EGME, glycerol and MB is changed to 15.9 ？, 17.5 ？, 19.0 ？, respectively. The montmorillonite crystal layer saturated in glycerol or MB is obviously expanded, which is facilitative for adsorbed molecules to enter the surface of the crystal layer, and the molecules also cover the layer better. The statistics of the existing research results indicate that the SSA reflects the composite effects of composition of various hydrophilic clay minerals and the relative proportions. Therefore, the SSA is correlated with the liquid limit, plasticity index and activity and other physical indicators, and it is available to fit them in the form of a power function. If the soils contain swelling clay minerals, poor correlation between the SSA and the clay fraction will be found because the effects of type of clay minerals cannot be reflected by the clay fraction.