山区公路建造环境级别的模糊粗糙评价方法

分析了影响山区公路工程建造环境的地质和地理条件,提出了环境级别问题,选出了岩溶发育率?钻孔岩(土)体芯采取率?软化特性?地形和坡度等5个关键因素作为建造环境分类的指标.基于隶属函数分段构造方法和等效性原理,确定了各因素的隶属函数形式.引入粗糙集理论中的知识依赖度和重要度原理,提出并建立了分类指标对于环境级别模糊权重的客观性确定方法.将分类指标?隶属函数及模糊权重计算三者结合,构建了山区公路工程建造环境级别的模糊评价方法.采用该方法分析了某工程场地,所得结论成为该工程建设决策的重要依据,展示了该研究方法的有效性和实用性.

Fuzzy Rough Set Evaluation Method for Construction Environment of Highway Engineering on Mountainous Area

Geographical and geologic elements that influence the constructi on environmenton highway engineering in mountainous area were analyzed, and an issue on environment grade for construction of highway engineering was put forward. Five key elements, namely the development rate of Karst, acquiring rate of integrated rock-mass core from bore, characteristics of softening for rock-soil, terrain and gradient, were pick out and considered as the indexes of construction environment classification. The expressions of subjective function for various elements were established based on the method for segment construction as well as the equivalent principle of subjective function. A new objective calculation method of fuzzy weight that various influencing element indexes subjected to construction environment classification grade was proposed based on the knowledge dependent degree and the importance axiom in rough set theory. Fuzzy evaluation method of construction environment grade of highway engineering in mountainous area was built through the classification index combining with subjective function and calculation method for fuzzy weight. An engineering example was analyzed by the fuzzy evaluation method of construction environment grade. The analyzed result was regarded as an important data when making decisions for engineering construction. Validity and practicability was revealed through above-mentioned practical example.