水位变化对库岸桥梁基础变形的影响  

The Influence of Water Level Variation on the Deformation of Bridge Foundation Located on Reservoir Bank

作　　者：吴铁营 张林洪[2] 李文波[2] 彭邵勇 段翔 戴学宇 

机构地区：[1]国家电投集团云南国际电力投资有限公司其培建设分公司,昆明650228 [2]昆明理工大学电力工程学院,昆明650500 [3]云南交通咨询有限公司,昆明650031 [4]中国水利水电建设工程咨询昆明有限公司,昆明650051

出　　处：《价值工程》2016年第26期217-221,共5页Value Engineering

基　　金：云南省交通运输厅科技专项资金项目(库岸公路破坏形式及对策研究)云交科2014(A)16

摘　　要：位于库岸的桥梁基础受水库水位变化的影响,桥梁基础周围的岩土体处于饱和—非饱和状态的变化中。这种变化将会使桥梁基础产生不同程度的变形,桥梁基础间的不均匀变形容易引起桥面的破坏,影响桥梁的正常运行。文章以金沙江中游某库区的公路桥梁基础为研究对象,建立库区边坡二维模型,模拟桥梁基础在不同水位下的水平及竖直位移的变化情况。计算结果表明:水库水位上升时,桥梁基础的水平位移增大,竖直位移先增大后减小;水库水位下降时,桥梁基础的水平位移减小而竖直位移增大,且变形速率与水位下降速率存在正相关关系。The bridge foundation in the reservoir bank is affected by the change of the reservoir water level, the rock and soil around the bridge foundation＇s state varies between saturation and non-saturation. This change will make bridge foundation to deform in different degrees. The uneven deformation between the bridge foundations will lead to the bridge failure of and affects the normal operation of the bridge. This paper takes a bridge foundation of highway located in the middle of Jinsha River as an example, and establishes the two dimensional model of reservoir slope to simulate the change of bridge foundation＇s horizontal and vertical displacement under different water levels. The results show that the horizontal displacement of the bridge foundation increases and the vertical displacement increases at first then decreases when the reservoir water level rises, on the contrary, the horizontal displacement decreases and vertical displacement increases when the water level falls. There is a positive correlation between the rate of displacement and down rate of water level.

关 键 词：库岸 桥梁基础 饱和—非饱和 水平位移 垂直位移 

分 类 号：TU279.72[建筑科学—建筑设计及理论]