高陡峡谷地带铁路桥梁工程建设适宜性分析研究

Suitability analysis of railway bridge construction in high and steep canyon zone

鉴于目前的研究进展来看,对于工程建设的适宜性分析大多集中在工程建设基础的稳定性这一方面,而在对建设在场地上的构造物的稳定性分析涉及较少且在铁路桥梁方面更是少有提及,文章以新建铁路瓮马铁路南北延伸线场坝大桥为例开展高陡峡谷地带铁路桥梁工程建设适宜性分析研究。从桥址区岸坡稳定性分析和结构物自身的稳定性分析两个方面开展铁路桥梁工程建设适宜性,为开展铁路桥梁工程适宜性分析提供了思路。从岸坡稳定性分析来看,在考虑最不利工况条件下,桥梁岸坡稳定桥梁工程建设条件较好。文章分别计算了桥墩在桩侧滑坡推力和桩侧土压力作用下的桩身位移值,并与规范要求进行对比,满足规范要求,且通过三维模拟予以验证。

In view of the current research progress,the suitability analysis of engineering construction mostly focuses on the stability of engineering construction foundation,while the stability analysis of structures built on site is less involved and rarely mentioned in railway bridges.Taking Changba Bridge as an example,the suitability analysis of railway bridge construction in high and steep canyon zone is carried out.Through the analysis and research,the following conclusions are drawn:The paper develops the suitability of railway bridge construction from two aspects:the stability analysis of bank slope in bridge site area and the stability analysis of structure itself,which provides ideas for the suitability analysis of railway bridge engineering.From the analysis of bank slope stability,considering the most disadvantageous conditions,the construction condition of bridge bank slope stability is better.In this paper,the displacement values of piers under the action of landslide thrust and soil pressure at pile side are calculated respectively,and compared with the requirements of the code,which meets the requirements of the code and is verified by three-dimensional simulation.