摘要
悬臂梁法是反倾层状岩质边坡弯曲倾倒破坏与稳定性分析的常用方法,然而目前主要做法是对破坏面上全部岩层依次迭代求解,不够简便,很难在现场快速初步判定边坡稳定性。在悬臂梁模型的基础上,通过对岩层临界失稳高度与预设破坏面上岩层高度比较分析,将破坏面上的岩层分为稳定区、主动倾倒区和被动倾倒区,进而基于极限平衡原理,提出相应的稳定性计算方法,同时利用S区几何面积的大小,初步判定边坡的倾倒风险。通过2个工程实例及离心实验结果验证了所提方法的可靠性,研究成果对反倾层状岩质边坡倾倒破坏稳定性评价与灾害防治具有重要的指导意义和应用价值。
The limit equilibrium method based on cantilever beam theory is a feasible method for analyzing flexural toppling in anti-dip layered rock slopes. However,most of the current calculation methods are iterated successively for all strata on the failure surface,which often requires a lot of mathematical calculation.It is difficult to evaluate the slope stability in the field quickly and preliminarily. Based on cantilever beam theory,the rock columns above the failure surface are divided into three sections:the stable section,the active toppling section and the passive toppling section by comparing the critical instability height with the present height of the block on the failure surface. Based on the limit equilibrium,the corresponding stability calculation method is proposed,and the risk of toppling failure can be preliminarily determined by using the geometric area of S area. 2 engineering examples and centrifuge experiments were illustrated for practical verification of the proposed approach. The research results of this paper have guiding significance and application value for the stability evaluation of flexural-toppling failure in rock slope.
作者
赵维
王润清
年廷凯
ZHAO Wei;WANG Runqing;NIAN Tingkai(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2019年第S02期3287-3295,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51579032,U1765107)
中央高校基本科研业务费专项重点项目(DUT16ZD211)。
关键词
边坡工程
弯曲倾倒
极限平衡
临界失稳高度
分析方法
slope engineering
flexural toppling
limit equilibrium
critical instability height
analysis method
