The invention relates to the technical field of tunnel hydraulics, in particular to a method of calculating
hydraulic pressure of a high-pressure
karst tunnel lining; the method comprises: A, determining geological conditions of an excavation section of a tunnel, wherein the geological conditions include one of the tunnel excavation section being in a homogeneous formation, and the tunnel excavation section longitudinally crossing a formation; B, determining the outer
diameter of each formation to the center of the tunnel, and corresponding head and
osmotic coefficient of each formation; determining outer
diameter of a grouting reinforcement ring, outer
diameter of a primary support, outer diameter of a secondary lining, and inner diameter of the secondary lining, as well as corresponding head and
osmotic coefficient; C, transforming Laplace's equation; D, calculating water inrush of the tunnel per linear meter, back head of the secondary lining, and back head of the primary support, and calculating back pore hydraulic water of the secondary lining and back pore
hydraulic pressure of the primary support. The invention is intended to provide the method of calculating
hydraulic pressure of a high-pressure
karst tunnel lining in order to decrease the leakage risk of a tunnel.