Steady-state seepage analysis method for annularly and actively controlling drainage and pressure relief of circular tunnel

The invention discloses a steady-state seepage analysis method and a steady-state seepage analysis device for annularly and actively controlling drainage and pressure relief of a circular tunnel, which are characterized in that active control drainage holes are generally arranged according to a longitudinal array of the tunnel, can be approximately considered as linear water leakage in the longitudinal direction, and generally can be approximately planar seepage; and establishing a two-dimensional geometric model of annular active control drainage of the circular tunnel. The method comprises the following steps of: changing a circular tunnel for annularly and actively controlling drainage and a surrounding soil body into a regular rectangular region through a conformal transformation method, expressing a water head of the rectangular region in a form of a series solution by using a superposition method and a separation variable method, and solving unknown numbers in the series solution according to continuous