福州台段316国道某大桥地质灾害成因分析研究

316国道某大桥自1990年通车以来长期运行，于1999年安全检查中发现大桥病害严重，后经修复加固后重新通车运行。文章以该大桥北岸(福州台)段的病害情况为例，分析其病害的成因．并着重从地质条件出发，在分析考虑场地土层类型与结构等地质条件的基础上，从地基稳定性和斜坡面的稳定性两方面进行相应的计算分析，并结合大桥发生损伤破坏地段范围和北岸(福州台)段深层位移监测成果资料进行综合分析评价。分析结果表明：北岸(福州台)段的不良地质条件及其对高填桥台方案的不适宜，是导致该大桥产生严重病害的重要原因；同时，通过加重补桩以阻止和控制桥台滑移的加固措施，其效果也并非最佳。因此，该大桥病害的修复加固方案设计和施工设计应充分考虑不良地质条件的主要控制作用因素。

Analysis on genesis of geological disaster of a bridge on 316 national road (Fuzhou bench)

A bridge on 316 national road was put into use in 1990 and was found serious geological diseases in 1999. Now it has been put into use again after being repaired and reinforced.Taking the north bank of the bridge(Fuzhou bench) as an example,the paper analyses the genesis of the disaster based on the geologic conditions such as types and structures of stratigraphy etc.,calculates the stability of the bridge foundation and the slope,also analyses the monitoring information of displacement in deep part of the foundation on the north bank(Fuzhou bench).It indicates that the main factores causing the disaster are the geological conditions and the unsuitable reinforement scheme of high-filling abutment and increasing piles.So the design of repairing the bridge and controling the disaster sould fully consider the main controlling factors of poor geological conditions.