摘要
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。
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.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2012年第8期2259-2264,共6页
Rock and Soil Mechanics
基金
国家自然科学基金资助项目(No.51078136)
湖南省自然科学基金(No.09JJ3113)
湖南省交通厅科技项目(No.200717)
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
cut-and-fill roadbed
differential settlement
gray correlation analysis（GCA）
sensitivity analysis
uniform design
