关键词: 半填半挖路基, 差异沉降, 灰色关联分析, 敏感性分析, 均匀设计

Abstract: First, the influence factors on the stability of the mountain cut-and-fill roadbed slope are investigated, in which two categories can be generally identified: the packing physico-mechanical parameters and the fill regional geometric parameters. Secondly, based on the further research on the sensitivity analysis method of influence factors involved in the slope stability, it is concluded that the gray correlation analysis (GCA) is particularly applicable for the analysis and evaluation of stability of the mountain roadbed slope which is a complicated uncertainty problem, and then the deficiency of the traditional GCA is improved. By combining the advantages of the uniform design that can dramatically alleviate the test times and computational efforts, based on the improved GCA experimental analysis method for the stability of the mountain roadbed slope is then developed. Finally, the influence factors on the stability of the mountain cut-and-fill roadbed slope are analyzed by using the proposed method. Results show that the packing physico-mechanical and the fill regional geometric parameters are more sensitive for the cut-and-fill roadbed deformation, and for the roadbed stability the packing physico-mechanical parameters are more sensitive than the fill regional geometrical parameters. It is therefore reveal that the proposed method can offer important instruction on the precaution and control for the failure of the roadbed posed by the lack of strength as well as the fill excavation joint surface of differential settlement. Also, it can provide significant reference for the design, construction and reinforcement.

Key words: cut-and-fill roadbed, differential settlement, gray correlation analysis(GCA), sensitivity analysis, uniform design