公路建设场地分类研究

Research of Classification System of Mountain Highway Site

针对干线公路设计时对公路建设场地类别评判的需要,将未确知度理论与层次分析法相结合,建立了山区公路建设场地评价模型。从地质条件、地貌条件、环境条件3个方面综合考虑,筛选出岩石单轴饱和抗压强度、岩体结构特征、岩体软化系数等9个起主要作用的影响因素建立未确知测度综合评判模型。采用运用成熟的AHP法对各判别指标权重进行计算,最后依据置信度识别准则对公路建设场地类别进行划分。将该模型应用到湖南S304公路改造项目中,得出该建设场地属于建设条件困难场地,与事实相符合。结果证明该模型可用于公路建设场地分类,其分析结果可作为设计和施工的重要依据。

To meet the demand for highway construction site classification and evaluation in trunk road design, the ＂mountain highway site evaluation model＂ was established by combining the unaseertained degree theory with AHP. The three aspects of geological conditions, geomorphic conditions, environmental conditions were overall considered, and the nine dominating factors including the saturated uniaxial compressive strength of rock mass, characteristics of rock mass structures, rock softening coefficient etc had been selected to work as unaseertained measure model discrimination index. AHP was used to check the index weight respectively and finally highway construction site types were classified by reliability recognition cri- terion. This proposed model was used in $304 highway retrofit project in Hunan province and generated the result that this jobsite fell into category of difficult construction constraints, which well coincides with the reality. Thus it is proved that this model can be applied to highway construction site type classification and the analysis results can provide significant basis for highway design and construction.