地下结构由于受岩土体和地下水等复杂地下环境的作用，保持其良好的健康服役状态非常困难，极有必要开发适合于地下水环境下的既有地下结构混凝土修复手段，达到延年益寿的目的。电化学沉积法是水环境下混凝土结构修复的重要手段。其最早是用于修复海工混凝土结构。近来众多学者针对陆上结构混凝土电化学沉积修复已开展了电化学沉积产物性能、修复试件制备、修复效果评估及其影响因素等方面的研究。但对于体现地下结构非对称性特征的混凝土电化学沉积修复试验研究不多见，对于地下结构混凝土非对称电化学沉积修复界面性能及其细观模型的研究更是罕见。为此，本项目将开展以下三方面的研究：1）地下结构混凝土非对称电化学沉积修复试验；2）地下结构混凝土非对称电化学沉积修复界面特征分析试验；3）考虑非对称修复界面特征的地下结构混凝土性能预测细观模型。该创新性的研究将加速电化学沉积法在地下结构修复中的应用。

It is difficult for the underground structures to keep good service performance under the complex environment of soils, rocks and underground water. To repair the existing underground structures, it is urgent to explore an effective repairing approach in the water environment, which will evidently provide extended durability, service life and security for the underground structures. The electrochemical deposition method is a promising repairing method for the concrete structure under the water environment, which was used to repair the marine structures at the very beginning. Current research focuses on its application for repairing the land concrete, whose contents are mainly in the areas of the deposition product’s properties, specimen preparations, healing effect evaluations and the factors that influence the healing effects. There are very few electrochemical deposition experimental studies that can capture the asymmetry characters of the underground structures, not to mention the asymmetric healing interface performance and the corresponding microscopic models for the underground structures repaired by this method. In view of this, the project is going to study the following contents: (1) the asymmetric test studies for the electrochemical deposition method to repair the underground concrete structure; (2) the test studies on the asymmetric healing interface performance between the deposition products and the underground structure; (3) the micromechanical models to predict the properties of the repaired underground structure considering the asymmetric healing interface bonding. The achievements of this innovative research will accelerate the application of electrochemical deposition method in the underground engineering.