Pour water and waterlogging is a common geological disaster and the main disease both in the construction tunnels and operation tunnels. AS the groundwater disaster conceal behind the reinforced concrete and the irregular conformation of uncompacted area is abound and other factor exist ,such as Moisture, air, grout, soil, so it is hard to detect and research this issue exactly .Using Geological Radar and analyzing field data, the following functions can be performed, such as detecting the thickness of concrete lining accurately, determining the distribution position and quantities of rebar and grid steel, searching existed cavity and uncompacted area behind the lining especially lining arch top.
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