改进了进化遗传算法 ,提出了新的交叉算子和变异算子 ,使之具有更好的全局收敛能力。砂土液化是一种危害极大的地震破坏现象 ,其影响因素很多 ,选择地震烈度、砂土粒径、相对密度、标贯击数和有效正应力为判据 ,利用改进了的进化遗传算法建立了砂土地震液化的判别模型。与现场液化情况比较表明 ,改进进化遗传算法应用于砂土地震液化的判别效果良好。 Improved evolutionary genetic algorithm, proposed a new crossover operator and mutation operator, so that it has better global convergence ability. Sand liquefaction is a kind of devastating earthquake damage phenomenon, and its influencing factors are many. Based on the selection criteria of seismic intensity, sand particle size, relative density, standard penetration number and effective normal stress, the improved evolutionary genetic algorithm A discriminant model of sand liquefaction is established. The comparison with the on-site liquefaction shows that the improved evolutionary genetic algorithm has a good discrimination effect on sand liquefaction.