Abstract: The bedrock underlying a subway station is steeply inclined and can be considered as an independent aquitard. The soil above the bedrock is a heterogeneous steeply inclined aquifer. The current analytical solution methods could not be readily applied. The Visual Modflow was used to establish the seepage model in this nonuniform aquifer. The seepage parameters can be obtained from the back analysis results.

Key words: Steeply Inclined, Heterogeneous, Back Analysis, Hydrogeological Parameters