excess fall meaning in Chinese

过大的落差

In this paper , the best reinforcement scheme , which was found by nerve network and genetic algorithm from serval reinforcement schemes , was applied to strengthen a prestressed concrete continuous rigid fame bridge with many quanlity faults , such as excess fall deflection of the main span deck > serious web slop crack existing between main pier abutment and one fourth span , and very poor mud jacking quanlity in the prestressing tendon tubs
本文针对某预应力混凝土连续刚构桥所存在的实际问题：如主桥桥面下挠度过大；主墩和四分之一跨径处均存在较严重的腹板斜裂缝；预应力管道压浆质量较差等。提出了几种加固方案，并用神经网络和遗传算法进一步优化出了较佳的加固方案，进行了加固前后效果对比分析。