地铁常用隧道杂散电流场三维有限元模拟

摘要

In order to analyze the distribution rules and influence ranges of different subway tunnels,three-di-mensional models of subway rectangular tunnels and subway sheild tunnels were established.By changing the value of carry-current,Ansys was used to simulate the distribution rule of subway stray current field under dif-ferent geological conditions.Simulation results show that,the potential attenuation is nonlinear from the subway tunnel to the surrounding underground,and the greater the current,the greater the maximum potential.The a-mount of leakage stray current of rectangular tunnels is less than sheild tunnels under same geological condition and same carry-current.%基于地铁不同隧道类型对杂散电流场分布规律的影响，建立地铁矩形和盾构型隧道的杂散电流场三维有限元模型，通过加载电流，在不同地质条件下利用ansys有限元软件进行仿真分析。研究结果表明：钢轨及钢轨到周围地下环境的电位均呈非线性衰减趋势；加载的电流越大，不同隧道周围相同位置处的电位不同；在钢轨加载电流和隧道周围地质条件相同的情况下，矩形隧道比盾构型隧道向外泄漏的杂散电流少。