研究渠道开挖过程中渠基回弹变形规律，对渠道底板施工具有指导意义。通过采用改进的分层沉降仪配磁感应沉降环方法，实测渠道二次开挖引起的渠基最大回弹量为102 mm，建立了回弹变形模型，定量分析了各影响因子对回弹变形的贡献度。结果显示：开挖卸荷是产生渠基回弹变形的主要影响因素，约占总回弹量的74%。渠道底板在2013年12月封闭后的5个月时间里，由时间效应引起的渠道底板回弹量仅为2.43 mm，对渠道底板结构影响不大，有利于渠道的安全运行。

The study on the resilience deformation rule of canal base in the process of canal excavation has a guiding significance to the canal floor construction. With the improved layered settlement instrument equipped with induction ring, we measured the maximum resilience of the canal base caused by secondary canal excavation to be 102 mm, and established a resilience deformation model, and analyzed quantitatively the contribution degree of each impact factor to the resilience deformation. The results showed that the excavation unloading was the main impact factor of canal base resilience deformation, accounting for about 74% of the total resilience. The canal floor resilience caused by time effect was only 2.43 mm in 5 months after being closed in December 2013. It had little influence on the floor structure, and was conducive to the safe running of the canal.

“十二五”国家科技支撑计划（2011BAB10B02）