灌溉井抽水对邻近高速铁路桥梁的影响流固耦合分析

Fluid Structure Coupling Analysis for Influence of Irrigation Well Pumping on High Speed Railway Bridge

高速铁路沿线附近存在大量农用抽水井,对地下水的随意开采导致部分线路基础的不均匀沉降,严重威胁列车安全。本文应用PLAXIS 3D软件对高速铁路沿线一抽水井降水导致的桥梁基础沉降进行数值仿真分析。计算结果表明:抽水后场地沉降及孔隙水压力均呈漏斗状分布;抽水结束后土体最终沉降趋于稳定;桥梁桩基下半段以及桩底的正应力有所增加。本文算例中,抽水井引起的桥墩最大沉降量为2.258 mm,桥墩最大差异沉降量为0.173 mm,没有超出Q/CR 9230-2016《铁路工程沉降变形观测与评估技术规程》的规定。

There are a large number of agricultural pumping wells along the high speed railway. The arbitrary extraction of groundwater leads to uneven settlement of the foundation along the line,seriously threatening the safety of trains and passengers. In this paper,based on the PLAXIS 3 D software,the numerical simulation analysis of the settlement effect caused by the precipitation of pumping wells along the high speed railway was carried out. The calculation results show that the settlement and pore pressure of the site are distributed in a funnel shape after pumping. The final settlement of the soil tends to be stable once the pumping is completed. The normal stresses of the lower half of the bridge structure and the bottom of the pile increase. The maximum bridge structure settlement and the differential settlement are with in the limit of Observation and Evaluation Specification for Settlement Deformation of Railway Engineering.