应用主成分分析法研究渗透介质的渗透稳定问题

Application of principal components analysis in researching of stability of materials under seepage

结合国内多个水电工程的大量渗透试验数据,在多维系统中选择了5项指标:干密度、孔隙比、不均匀系数、渗透系数和临界坡降,采用多元统计中的主成分分析法进行聚类,运用回归分析建立了砂性土、砂卵石土、断层带物质三类渗透介质的渗透模型。将所建立的断层带物质渗透模型应用到单薄山梁断层带的渗透稳定分析预测上,得到了模型计算结果与渗透试验所得结果相一致的结论,说明主成分分析法在渗透稳定分析中具有一定的适用性。

The principal components analysis method is introduced into the prediction for stability under seepage, so as to the more factors can be considered. Based on the great deal of experimental data for seepage, three different models are built for material in faulted zone, sandy soil and sand-gravel soil respectively, after dry density, porosity ratio, non-uniform coefficient, permeability coefficient and critical hydraulic gradient are chosen as evaluation indexes. A flimsy mountain on the left dam of Heihe reservoir is studied, and the model for material in faulted zone is used to predict the stability of the faults area in this mountain under seepage At last, the consistent results with experimental data indicates the principal components analysis method is proper to assess the slope stability under seepage.