Based on the Fuzhou Binhai Express Line project,a multi-objective optimization model of shield tunneling parameters is established.According to the shortcomings of NSGA-Ⅱ algorithm in the distribution of initial population and the speed of searching for optimization,NSGA-Ⅱ algorithm is improved by using orthogonal test method.The multi-objective optimization is carried out for the example of the medium-weathering granite stratum,and the optimization performance before and after the algorithm improvement is analyzed and the optimal combination of tunneling parameters is obtained by analyzing.The results show that the optimized tunneling parameter combinations are the same as the optimization results before and after the algorithm improvement.The results show that the average tunneling specific energy of the optimized shield structure is reduced by 6.29％,the average tunneling efficiency is increased by 7.19％,and the average edge hob wear per unit distance is reduced by 2.37％.The optimized shield cutter performance is greatly improved,which verifies the feasibility and effectiveness of the optimization model.
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