膨胀土胀缩等级的模糊评判

Fuzzy Evaluation on Swell Shrink Grade of Expansive Soil

该文分析了现有膨胀土胀缩等级评判方法和标准,通过研究膨胀土物化实验的结果,提出了能充分反映和表征膨胀土胀缩机理和特性,且实验简单、容易测量的比表面积,小于5μm颗粒百分含量和塑性指数判别膨胀土等级的方法。建立了膨胀土胀缩等级判别的模糊数学模型,并通过最小二乘法分析了上述三项指标与膨胀土自由膨胀率之间的关系,根据理论分析和大量实测资料建立了每个指标的权重。

Based on the analysis of the existing swell shrink grade evaluation methods and standards and through the study of physical chemistry experimental results of expansive soil, the article puts forward the method able to sufficiently reflect and characterize the swell shrink mechanism and property of the expansive soil, and the simply experimented and easily measured specific surface area, and <5 m grain percentage content and plastic indexes distinguishing the gade of expansive soil. A fuzzy mathematical model is set up to distinguish the swell shrink grade of expansive soil. And the least squares method is used to analyze the relation among the above three indexes and free swelling ratio of expansive soil. The weight of each index is established according to the theoretical analysis and measured data.