Method for quickly estimating characteristic curve of large-deformation surrounding rock and longitudinal deformation curve of roadway

The invention belongs to the technical field of mine roadway engineering design, and provides a method for rapidly estimating a large-deformation surrounding rock characteristic curve and a roadway longitudinal deformation curve. The method comprises the following steps: 1) acquiring rock mass mechanical parameters, initial stress conditions and roadway initial radius; 2) calculating the standard maximum radial displacement of the tunnel wall and the standard maximum plastic zone radius of the surrounding rock in the longitudinal direction of the roadway based on the small deformation theory under different support pressures; 3) converting based on a small deformation calculation result to obtain a surrounding rock characteristic curve and a roadway longitudinal deformation curve under a large deformation theory; and 4) calculating to obtain the radial displacement of the tunnel wall and the current radius of the tunnel at different longitudinal positions under the large deformation theory. According to the m