Grounding Characteristics of Natural Grounding System in Underground Tunnel

With the development of underground cables, more and more underground tunnel structures are put into use. Based on the consideration of the structural characteristics of underground tunnels, this paper considers that the tunnel wall reinforcement can be used as a natural grounding system. Two tunnel natural grounding system calculation methods are analyzed, and it is proposed to solve the grounding resistance of underground tunnels by numerical calculation. Through the equivalence of the natural grounding system of the tunnel, using orthogonal polygons to continuously approximate the circle, obtaining the comparison results of different orthogonal polygons and the number of units, and calculating the actual situation, it is found that the method in this paper can effectively reduce the calculation workload.