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首先对山区半填半挖路基边坡稳定性影响因素进行了分析,在总体上将其归纳为填料物理力学参数和填方区的几何参数;其次在深入研究边坡稳定影响因素敏感性分析方法的基础上,提出灰色关联分析特别适合于山区路基边坡稳定性这种复杂而且具有不确定性问题的分析和评价,并对传统灰色关联分析中的不足之处加以改进;然后结合均匀试验设计能使试验次数和计算工作量大大减少的优点,建立起基于改进灰色关联的山区路基边坡稳定性均匀试验分析方法;最后用该方法对某山区公路半填半挖路基边坡变形稳定性及强度稳定性影响因素进行了分析。结果表明,填方区填料的物理力学参数和几何参数对半填半挖路基变形均比较敏感,而对于强度稳定性填方区填料物理力学参数比其几何参数敏感,这可为预防和控制该类路基因强度不足失稳及填、挖结合面的差异沉降提供重要指导,为设计、施工及加固提供重要参考。
Firstly, the influencing factors of slope stability on semi-fill and semi-dig roadbed in mountainous area are analyzed, which are generally summarized as the physical and mechanical parameters of fill material and the geometrical parameters of fill area. Secondly, the sensitivity analysis method of influencing factors of slope stability , This paper puts forward that the gray relational analysis is especially suitable for the analysis and evaluation of complex and uncertain problems in slope stability of mountainous subgrade and the improvement of the deficiencies in the traditional gray relational analysis. Which can greatly reduce the number of tests and computational workload, and establish a uniform test and analysis method of slope stability of mountainous embankment based on improved gray relation. At last, The influencing factors of strength stability are analyzed. The results show that the mechanical and geometrical parameters of fill in fill zone are more sensitive to the deformation of semi-filled and semi-filled roadbed, while the physical and mechanical parameters of fill in fill zone are more sensitive than their geometric parameters for strength stability. It is an important guide for design, construction and reinforcement of instability of quasi-road gene and instability of fill and excavation surfaces.