摘要
针对膨胀土胀缩等级评定中单指标和多指标评价方法的不足,将液限、总胀缩率、塑性指数、天然含水率以及自然膨胀率作为膨胀土胀缩等级评价的指标,采用熵值法评价各不同指标的权重,以理想点原理为依托,提出了膨胀土胀缩等级评价的熵值-理想点模型。首先建立胀缩等级的理想点和反理想点矩阵,通过构造距离函数来表征样本与不同胀缩等级的理想点和反理想点距离,然后引入理想点贴近率的概念评价样本等级,即理想点距离越小,贴近率越小,样本越接近于该等级。该模型在某工程膨胀土胀缩等级评价中的应用表明:采用熵值-理想点模型评价的膨胀土的胀缩等级与实际情况吻合较好,说明该模型具有合理性和实用性。
Due to the shortcomings of single index and multi-index evaluation method in grade of shrink and expansion for the expansive soil,the liquid limit and swell-shrink total ratio,plasticity index,natural moisture content and natural expansion rate were selected as the evaluation index of the grade of shrink and expansion for the expansive soil evaluation,it was evaluated the weights of different indexes by using entropy method, based on the principle of ideal point,the model of entropy-ideal point method of shrink and expansion for the expansive soil had been established. It was firstly created ideal point and negative ideal point matrix about the grade of shrink and expansion,by establishing a distance function to char-acterize of samples with different grade of shrink and expansion ideal point and the negative ideal point distance,and then introduced the concept of ideal point close to the rate of evaluation sample grades,i. e. the ideal point distance was smaller,close to the rate is smaller and the closer the sample in the grade. Finally,the model of the grade of shrink and expansion was applied to evaluate a project. The results indicate that the assess-ment level is in good agreement with the actuality,and shows that the model has a certain rationality and practicality.
出处
《人民黄河》
CAS
北大核心
2014年第3期106-107,110,共3页
Yellow River
基金
贵州大学研究生创新基金资助项目
贵州省地质灾害监测预警与决策支持平台建设项目(z113278)
关键词
膨胀土
胀缩等级
熵值法
理想点法
贴近率
expansive soils
grade of shrink and expansion
entropy method
ideal point method
close degree
