芦台地道桥施工降水对既有铁路路基沉降的影响研究

结合拟建津榆公路芦台地道桥下穿津山铁路桥段施工降水工程实例，根据不同的U型槽修建长度，研究该中心位置地下水位降低对正在运营的铁路路基沉降的影响。借助FLAC3D软件，根据比奥固结理论，构造三维沉降模型，对六种工况进行数值模拟分析，研究了不同工况下降水对铁路路基的影响。结合相关规范要求，针对模拟分析的总体结果，得出U型槽的修建长度控制在距离既有铁路路基两侧各100 m左右较为合理的结论。

Research on Effect of Dewatering in Lutai Underpass Bridge Construction on Settlement of Existing Railway Subgrade

Combining with the case study of dewatering in construction of the section under passing Tianjin-Shanhaiguan Railway of Lutai Underpass Bridge of Jinyu Highway, which is planned to be built, how the dewatering of underground water table at the central position, according to different building length of U-type groove, affects subgrade settlement of railway in operation was studied. With FLAC3D software, 3D settlement model was established in accordance with Biot consolidation theory to carry out numerical simulation analysis under six working conditions and study the effect of dewatering on railway subgrade under each condition. The results show that it is reasonable for the building length of U-type groove to be controlled about 100m away from both sides of the existing railway subgrade.