城市轨道交通高土壤电阻率车站接地网设计新方案

A New Design Scheme of Station Earthing Grid with High Soil Resistivity for Transit

对国内城市轨道交通高土壤电阻率车站的接地网设计方案进行分析。针对沈阳城市轨道交通9号线存在的高土壤电阻的车站,提出人工接地网与结构围护桩并联的接地网设计方案,从理论上详细论证该方案的可行性及效果,并在沈阳城市轨道交通9号线吉利湖街车站进行实际测量。结果表明,该方案能够较大地降低高土壤电阻率车站接地网的接地电阻,可以满足对接地网电阻1Ω以下的要求。

This paper analyzes the design scheme of the station earthing grid with high soil resistivity in the domestic transit. In view of Shenyang transit line 9 station with high soil resistivity, the parallel connection earthing grid design scheme for the artifi cial earthing gird and structure defence pile is put forward. The feasibility and effectiveness of the proposed scheme is theoretically demonstrated in detail, and Jilihu Street station was measured in the site of Shenyang metro line 9. The results show that the scheme can greatly reduce the resistance of the earthing grid with high soil resistivity, which can meet the requirements of the earthing resistance of 1 Ω or below.