混凝土裂缝严重影响地下结构健康服役性能。作为颇具前景的裂缝自修复新手段，矿物自溶自修复法可实现地下水环境下混凝土裂缝自修复。结合服役条件，本项目以荷载/环境耦合作用下的地下结构混凝土为对象: 基于热力学、数学规划和随机细观力学等建立矿物自溶自修复体系优化设计方法；采用电镜、EDS和CT技术等表征裂缝矿物自溶自修复过程地下结构混凝土微结构演化特征，揭示荷载/环境耦合作用对矿物自溶自修复机制影响规律；建立地下结构裂缝矿物自溶自修复效果多尺度评价方法，运用XRD、电镜和纳米压痕技术等分析矿物沉积产物和修复界面成分、形貌和性能；阐明荷载/环境耦合作用对裂缝自修复效果劣化机制；基于分子动力学模拟再现自修复界面形成和演化过程；建立含修复界面、沉积产物和裂缝等的地下结构混凝土性能演化多尺度模型。研究成果探清荷载/环境耦合作用下地下结构混凝土裂缝矿物自溶自修复机制和时效演变规律，提升地下结构长期服役性能。

The service performance of the underground structure is degraded by the concrete crack seriously. The mineral autolysis self-healing method is a promising crack healing approach for the concrete material. It can realize the crack self-healing for the concrete in the groundwater environment. With the concrete material of the underground structures as the objective, the project focus on the following studies by considering the service conditions (with the coupled effects of the load and the environment): The optimum design method is proposed for the mineral autolysis self-healing system based on the thermodynamics, the mathematical programming and the stochastic micromechanics, etc. The microstructure evolutions of the underground concrete during the mineral autolysis self-healing process are characterized using the electron microscope, energy dispersive spectrum (EDS) and computed tomography (CT) technologies, etc. The coupled effects of the load and environment are analyzed on the self-healing mechanism for the underground concrete. The multiscale evaluation framework is set up for the underground structures repaired by the mineral autolysis self-healing method. The constituents, the morphology and the properties of the mineral deposition products and the healing interface are analyzed by X-Ray Diffraction (XRD), the electron microscope and nanoindentation technologies, etc. The coupled effects of the load and the environment are studied on the healing effectiveness of the underground structures. The formation and evolution of the self-healing interface are analyzed based on the molecular dynamics simulation. The multiscale model for the performance evolution of the healed concrete is proposed considering the effects of the healing interface, mineral deposition products and the cracks, etc. The research achievements will disclose the crack self-healing mechanism and healing effectiveness evolution for the underground concrete repaired using the mineral autolysis self-healing method with the coupled effects of the load and the environment. The achievements will improve the long-term service performance of the underground structures.