Tunnel blasting construction over-break and under-break optimization method

The invention relates to the field of tunnel construction, and particularly discloses a tunnel blasting construction over-break and under-break optimization method which comprises the following steps: S1, selecting an initial blasting parameter set; s2, rock mass areas are divided, and rock mass quality evaluation parameters of all the rock mass areas are obtained; s3, a mapping relation model of input parameters and output parameters is built, the input parameters are rock mass quality evaluation parameters and initial blasting parameters, and the output parameters comprise over-excavation and under-excavation area parameters, blast hole utilization rates, vault sinking parameters and dimension stone size parameters; s4, training the mapping relation model based on input parameters until the mapping relation model is stable; and S5, based on the smooth blasting parameter range table, using an optimization algorithm to obtain and output optimal smooth blasting parameters. The method has the advantages that th