The classification of the grade of shrink and expansion for the expansive soils based on information entropy and uncertainty measurement theory
The classification of the grade of shrink and expansion for the expansive soils based on information entropy and uncertainty measurement theory
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发表时间：
2010
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通讯作者：
Zhou Jian
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作者：
Zhou Jian
针对膨胀土缩胀等级判别中存在的不确定性因素，基于不确定性度量理论，建立了膨胀土缩胀等级分级模型，包括反映膨胀土缩胀的5个指标，即：膨胀土的液限、膨胀力、塑性指数、天然含水量、自由膨胀率等指标，根据15组膨胀土试样的实测数据，构造未确知函数，定量分析解决了收缩和膨胀评价中的不确定性问题，并利用熵理论计算各因素的指标权重，根据不确定度理论建立了膨胀土收缩等级和膨胀等级的不确定度识别准则，并利用该准则和权值计算了膨胀土收缩等级和膨胀等级的评定值，给出了膨胀土收缩等级和膨胀等级评定结果分类模型与物元可拓评判方法具有良好的一致性，该评价方法解决了收缩性和膨胀性等级评价的不确定因素问题，并可以根据难易程度排列评价值的顺序。
Due to the uncertain factors in judging the grade of shrink and expansion of the expansive soils,the classification of the grade of shrink and expansion model of the expansive soils was established based on the uncertainty measurement theory,including five indexes reflecting the shrink and expansion of expansive soil,i.e.,liquid limit,swelling force,plasticity index,natural moisture content,free swelling ratio of expansive soil.According to the 15 sets of measured data of expansion soil samples,the unascertained function was formed and the uncertainty problems in shrink and expansion evaluation were solved by quantitative analysis.Entropy theory was used to calculate the index weight of the factors,and credible degree recognition criteria were established according to the theory uncertainty measurement.Thus we finally calculated the evaluation values of shrink and expansion grade of the expansive soils by using the weight values and the criteria.The evaluation results of this classification model was good consistent with that of the matter-element extension judging method.This evaluation method has solved the uncertainty factors problems of shrink and expansive grade evaluation,and can also arrange the order of the evaluation values based on the difficult degree.