Finite element simulation of stray currents on subway shield tunnel

Guo Wang, Xiaoxiang Pei

COMPUTER MODELLING & NEW TECHNOLOGIES 2014 18(12D) 150-156

Lanzhou Jiaotong University, Lanzhou, 730070, China

Three-dimensional Finite element model and a circuit element model were simulated respectively in homogeneous soil media and stratified soil media by loading different currents of railway. Simulation results show that the potential attenuation is nonlinear from the subway tunnel to the surrounding underground environment and along far away rail loading current of direction; With the loading current increasing, the potential of surrounding media advanced, to increase the resistance of the ragion near the subway railway can reduce the effect scope of the stray current. Compared to the traditional model of circuit elements, the three-dimensional finite element model can calculate the potential value of each position on the running rails and surrounding, resulting in stray current sphere of influence.