Some problems can often be found around the earth-termination system in practical metro station projects,including high soil resistivity,a large volume of rocks,and high construction difficulty,and conventional earthing schemes have certain limitations;the earthing scheme for the metro that uses the enclosure structure at the station as the natural earthing electrode is proposed,the specific schemes for different types of stations are analyzed and applied to such projects as the Metro Line 12 in Zhengzhou,achieving good earthing effect;such earthing scheme is verified,and compared with conventional earthing schemes for metro,such scheme is characterized by higher adaptability,simpler process,lower construction difficulty,better effect,lower construction cost,and shorter construction duration.
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