高海拔、高流速条件下泄水构筑物抗冲磨混凝土早期开裂与其本身要求的高抗冲磨、高耐久性之间存在严重矛盾，是亟需解决的重大理论和技术问题。收缩变形是抗冲磨砼早期开裂主要原因，但有关其收缩变形裂缝控制至今未能很好解决。浇筑成型的砼结构处于水化-温-湿-力多场耦合作用环境，与仅考虑单一因素的收缩开裂评估结果之间存在很大差异。本课题拟通过理论和试验研究，构建考虑高海拔环境和抗冲磨砼材料组成特点的水化-温-湿-力多场耦合作用机制；揭示抗冲磨砼温湿度传输与分布规律，提出综合反应材料性能、环境条件、围岩类别、尺寸效应、施工工艺等因素影响的泄水构筑物抗冲磨砼抗裂性评估和设计方法；研究基于温度场与膨胀历程协同调控的抗冲磨砼抗裂性提升技术，结合施工工艺措施，提出泄水构筑物抗冲磨砼成套防裂技术方案。研究成果为全面控制高海拔、高流速条件下泄水构筑物抗冲磨砼早期开裂、保障工程建设质量与服役寿命提供理论基础和技术支撑。

There has been a serious contradiction between early-age crack and the high requirements of abrasion resistance and durability for the drainage structure with high flow velocity in high altitude area, which is a significant theoretical and practical issue and should be solved urgently. Shrinkage deformation is one of the most important reasons for early-age abrasion resistance concrete crack. However, the crack prevention of shrinkage deformation has not been well developed yet. After pouring, the concrete structure undergo the multi-field coupling condition of hydration, temperature, humidity and mechanics. By which, the risk assessment results of shrinkage crack are quite different compared with that under the condition of single factor. Theoretical and experimental researches will be adopted in this project to build multi-field coupling mechanism of hydration, temperature, humidity and mechanics, which will consider the environment effects of high altitude and the component characteristics of abrasion resistance concrete materials. And the evolution law of temperature and humidity transmission and distribution will be revealed. Further, the anti-crack evaluation and design method of drainage structure will be proposed, in which the influence factors of material properties, environmental conditions, surrounding rock types, size effects and construction technologies will all be considered. Based on the synergy-regulation technology of temperature field and expansion history, a new technology of improving cracking assistant will be developed. And a complete set of crack prevention technical schemes of the abrasion resistance drainage structures will be proposed with constructive technologies. The research achievements could provide theoretical basis and technical support for early-age cracking control of abrasion resistance concrete, assurance of construction quality and service life of the drainage structures with high flow velocity in high altitude area.