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在介绍渗析(液相)法与气相法的基础上,对新疆阿尔泰膨润土在自由状态下的土水特征进行了室内实验研究,获取了相应的土水特征曲线,并对所得的土水特征曲线的基本特征进行了分析研究,最后提出了土水特征曲线的几种表达方式,分析了新疆阿尔泰膨润土的体积变化特性及其对土水特征曲线形状的影响。结果表明:实验室中渗析(液相)法与气相法的结合,可以完成整个吸力范围内土的土—水特征曲线的量测;新疆阿尔泰膨润土具有极强的吸水性和膨胀性,但其持水性能低于内蒙古高庙子膨润土,其原因可能与塑性指数大小有关;对于体积受吸力变化影响较显著的膨润土,宜用重力含水量表达其土—水特征曲线。
Based on the introduction of dialysis (liquid phase) method and gas phase method, the indoor experimental study on the characteristics of bentonite in Xinjiang under free state was carried out, and the corresponding soil-water characteristic curve was obtained. The obtained soil-water characteristic curve Finally, several expressions of soil-water characteristic curve are proposed. The volume change characteristics of bentonite in Altai, Xinjiang and its influence on the shape of soil-water characteristic curve are analyzed. The results show that the combination of the dialysis (liquid phase) method and the gas phase method in the laboratory can measure the soil-water characteristic curve of the soil within the whole suction range. The bentonite from Altai, Xinjiang has extremely strong water absorption and expansibility. However, The reason of water holding capacity is lower than that of Gaomiaozi bentonite in Inner Mongolia. The reason may be related to the plasticity index. For bentonite, whose volume is significantly affected by the change of suction, it is appropriate to express its soil-water characteristic curve by gravity water content.