Abstract: Through the analysis of geological and geophysical characteristics, geophysical forward numerical simulation and actual electrical structure analysis, it is concluded that the electrical structure characteristics of urban underground “piping” are resistivity cascade zone fusion area, low resistance area is inferred to be filled water "piping" channel, high resistance area is inferred to be dry or unfilled water “piping” channel. The resistivity cascade zone with slow variation, low resistance zone and high resistance zone are inferred as potential “surge” channels. Because the inversion estimation of geophysical results has multiple solutions, it is suggested to combine geological data for comprehensive analysis. Therefore, the application of high-density electrical method to investigate the spatial distribution of urban underground “piping” has great guiding significance for solving the existing safety problems in advance, as well as for the development, management and comprehensive utilization of urban underground space.

Key words: High Density Resistivity Method, Piping, Urban Underground Space