地铁杂散电流场的有限元模拟  

Finite Element Simulation of Subway Stray Current Field

作　　者：胡云进[1] 钟振[1] 方镜平[1] 

机构地区：[1]浙江大学建筑工程学院,浙江杭州310058

出　　处：《中国铁道科学》2011年第6期129-133,共5页China Railway Science

基　　金：国家自然科学基金资助项目(50809059);水体污染控制与治理科技重大专项经费资助项目(2009ZX07424-004)

摘　　要：为了研究地铁杂散电流场的分布规律及其影响范围,建立二维地铁杂散电流场数学模型,采用伽辽金有限单元法进行求解,根据有限元控制方程编制求解程序。对存在解析解的圆环域恒定电位场的模拟计算结果表明,该数学模型和计算程序是合理的可行的。对均匀介质、成层介质的地铁杂散电流场模拟计算结果表明:从地铁隧道到周围地下环境的电位都是非线性衰减的;距离地铁隧道越远,杂散电流强度越小;加大地铁隧道附近区域的电阻可以减小地铁杂散电流的影响范围。本文有限元模拟计算结果可作为确定杂散电流防护范围、定量评价地铁杂散电流对周围地下环境影响程度的依据。In order to study the distribution rule and influence range of subway stray current field,a two-dimensional mathematical model of subway stray current field was developed.The Galerkin finite element method was used as numerical simulation means and a computation program for modeling subway stray current field was worked out based on the finite element system equations.Steady potential field for an annular domain with analytical solution was calculated by use of the program.Calculation result shows that the mathematical model and the computation program are both reasonable and feasible.Numerical simulations of subway stray current field for homogeneous media and stratified media were conducted.Simulation results show that the potential attenuation is nonlinear from the subway tunnel to the surrounding underground environment and the farther from the subway tunnel,the smaller the stray current strength.To increase the resistance of the region near the subway tunnel can reduce the effect scope of the stray current.The finite element simulation results can be used for determining the scope of stray current protection and quantitatively evaluating the impact of stray current on the surrounding underground environment.

关 键 词：地铁 杂散电流场 电腐蚀 均匀介质 成层介质 

分 类 号：U231.8[交通运输工程—道路与铁道工程] U228.6