油气管道沿线土壤腐蚀性的模糊物元综合评价

FUZZY MATTER ELEMENT COMPREHENSIVE EVALUATION FOR SOIL CORROSIVITY ALONG THE GAS PIPELINE

由于土壤腐蚀性的常规评价方法都是基于分级界线明确的多因素标准 ,往往漏失一些有用信息 ,甚至造成错误的结论。为此 ,基于模糊物元理论提出了金属管道沿线土壤腐蚀性的模糊物元综合评价的新方法。该方法的基本思路是 :把模糊数学与物元分析相结合 ,利用模糊边界取代了常规的“清晰”边界 ,根据分析对象间的“相似性”的程度对其进行综合评价。该方法的关键在于 :①确定土壤样品相应理化指标的隶属度 ;②确定各特征指标的权重复合物元 ;③确定关联系数复合模糊物元 ;④确定关联度复合模糊物元。与该方法相关的基本概念、理论及实施程序被阐明。通过四川新场气田 -青白江输气管道沿线土壤的腐蚀性评价说明了其有效性。

The conventional evaluation methods of soil corrosivity on basis of multifactorial standards of definite classifying line often lose some useful information and even cause some wrong conclusions. Based on the theory of fuzzy material - element, a new method for comprehensively evaluation of soil corrosivity along metal pipelines is presented. The basic ideas are to combine fuzzy mathematics with matter element analysis, substitute fuzzy boundaries for the conventional definite boundaries and comprehensively evaluate the objects to be analyzed according to their similar extent. The key of this method is to determine the membership grades of corresponding physical and chemical indexes of soil samples, composite matter element of weights of each characteristic index, composite fuzzy matter element of relational coefficients and grades. The related basic concepts, theory and implementation of the method are expounded in this paper. The effectiveness of the method is proved by soil corrosivity evaluation along gas pipeline from Xinchang' s gas field to Qing Baijiang in Sichuan.