铁道科学与工程学报2016，Vol.13Issue(11)：2154-2162,9.
深大宽张裂隙条件下岩质桥基边坡稳定性分析
Analysis of rock slope stability of bridge foundation under the condition of wide tension fissure
摘要
Abstract
Some joint surfaces develop into the deep and wide tension fissure in the rock slope of a bridge founda-tion because of stratigraphic heave.The fissure,one type of stress-release crack contributing to human activity, has a great influence on the determination of the position of bridge foundation and is the focal point to the analysis of rock slope under bridge loading.On the basis of field investigation,the method of stereographic projection was utilized to analyze the stability of the jointed rock mass,and the safe distance of bridge foundation was obtained by calculating the empirical formula involving RMR and fixing that after defining the position of the wide fissures.The failure model and stress regime of the rock mass were analyzed using finite element method and Discrete element method.The rock slope stability of the bridge foundation under the proposed safe distance position was analyzed comprehensively and verified.The analysis results indicate that the front of the rock mass slope is not susceptible to the load for the existence of the wide tension fissures,while the bottom of the fissure is high stress concentration ar-ea where it is prone to failure of the rock mass again.The bridge foundation is safe under the proposed position.关键词
宽张裂隙/岩质边坡/稳定性/数值模拟Key words
wide tension fissure/rock slope/stability/numerical simulation分类
交通工程引用本文复制引用
孙春卫,巫锡勇,凌斯祥,任勇,李涛,廖昕..深大宽张裂隙条件下岩质桥基边坡稳定性分析[J].铁道科学与工程学报,2016,13(11):2154-2162,9.基金项目
国家自然科学基金资助项目 （）
