既有铁路线下公铁立交桥施工技术及方案评估

Project Evaluation and Construction Technology for Viaduct Under Existed Railway

某公铁立交桥位于浙赣线K1 8+32 6 7处 ,立交桥地基承载力差 ,施工便梁支点难于保持稳定 ,且施工期间两边孔产生横向位移 ,中孔顶进困难。针对这些问题 ,提出新方案 ,并采用解析法和数值有限元法 ,计算在列车荷载作用下边箱体地基承载力、底板沉降和最大沉降差以及边箱体结构强度 。

The mentioned viaduct is situated at K18 + 326.7 of Zegan Railway, wh ere the bearing capacity of the ground is quite poor, the beam for construction work is hard to keep stable, in addition, there will be transverse displacement of both side openings during construction, making the advancement of medium open ing difficult. A new project was suggested, and the bearing capacity of the grou nd under side cabin, the settlement of bottom plate and maximum difference of se ttlement during train loading as well as the strength of the side cabin were cal culated, using analytical method and numerical FEM, some suggestions for referen ce were given for construction of this viaduct.