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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 foundation of the bridge located on the bank bank is affected by the change of reservoir water level. The rock mass around the bridge foundation is in the state of saturation-unsaturated change. This change will make the bridge foundation produce different degrees of deformation, uneven deformation of the bridge foundation easily lead to the destruction of the bridge, affecting the normal operation of the bridge. Taking the highway bridge foundation of a reservoir area in the middle reaches of the Jinsha River as the research object, a two-dimensional model of the slope in the reservoir area is established to simulate the changes of the horizontal and vertical displacements of the bridge foundation at different water levels. The calculation results show that when the reservoir water level rises, the horizontal displacement of bridge foundation increases and the vertical displacement first increases and then decreases. When the reservoir water level decreases, the horizontal displacement of bridge foundation decreases and the vertical displacement increases, and the deformation rate and There is a positive correlation between the rate of water level drop.