摘要
在野外调查及室内试验分析的基础上,阐述了黄土高原北部砂黄土边坡破坏的主要形式,并分析了制约砂黄土高边坡稳定性的相关因素。以陕北地区高等级公路边坡为例,采用极限平衡条分法,建立了砂黄土边坡的状态方程;将抗剪强度参数c、φ值作为随机变量,采用蒙特卡罗(Monte_Carlo)法对砂黄土高边坡进行了可靠度分析。计算结果与已发生破坏的典型砂黄土边坡对比分析表明,抛物线型破坏面可以较好地逼近实际滑裂面;对于同一边坡而言,在大致相同的总体坡度条件下,阶状坡的稳定性明显优于坡形为一坡到顶的边坡。文章基于分析计算结果,对210国道绥德段砂黄土边坡进行了优化设计,所提出的砂黄土高边坡优化设计思路和方法可供工程设计部门参考。
Through field iwvestigation and tests, the main failure models and the influence factors of sandy-loess slope stability of China Northem Loess Plateau is summarized in the paper. Slice method is used to build up performance function. Reliability analysis is carried out by Monte-Carlo stochastic simulation. The parabolic slipping surface is suggested to approximate the real but unknown slipping surface. The results showed that the slope stability of stepped excavation surface is higher than that of linear excavation surface. The methodology has been successfully applied to the slopes in Suide section along National Highway 210.
出处
《中国地质灾害与防治学报》
CSCD
2005年第4期5-10,共6页
The Chinese Journal of Geological Hazard and Control
基金
国家自然科学基金资助项目(40102025)
关键词
砂黄土
高边坡
黄土滑塌
可靠度分析
优化设计
陕北
sandy loess
high slope
loess collapse
reliability analysis
optimization design
Northern Shanxi
