Damage grading evaluation method and system for partition wall structure in tunnel and application

The invention provides a tunnel middle partition wall structure damage grading evaluation method and system and application, and relates to the technical field of blasting, and the method comprises the steps: obtaining the horizontal displacement of each steel arch at different height positions through blasting simulation of a numerical analysis model; obtaining a relational expression among the explosive loading amount, the explosion distance, the height and the horizontal displacement through fitting and calculation; establishing grading indexes; and displacement of each steel arch at all height positions after blasting construction is obtained and compared with the grading index, and the damage grade of each position of the middle partition wall structure is obtained. According to the method, the displacement amount of each steel arch at all height positions after blasting construction is obtained through simulation, fitting and calculation, and grading evaluation on the damage degree of any position of th