礁岸再造珊瑚礁混凝土损伤机制及其服役性能研究

项目名称： 礁岸再造珊瑚礁混凝土损伤机制及其服役性能研究

项目编号： No.41472287

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 地质学

项目作者： 沈锦林

作者单位： 中国科学院武汉岩土力学研究所

项目金额： 95万元

中文摘要： 为克服建筑原材料不足并竭力降低海上运输成本，我国南海岛礁工程建设就地取材，采用海水拌养珊瑚礁混凝土结构型式。在复杂海洋环境和恶劣海况条件下，现役珊瑚礁混凝土构筑物出现大面积损伤，直接影响着海防工程的安全性和稳定性。本项目以南海珊瑚礁混凝土损伤机制及其耐久性为主线，综合运用现场调查取样、室内模拟试验、理论分析和数值计算等技术手段，探寻海水拌养珊瑚礁混凝土破坏模式及其影响规律；从宏、细、微观多尺度获取珊瑚礁混凝土在温差骤变交替(T)、浪溅碎屑冲刷(M)和盐雾化学侵蚀(C)等作用下的损伤机制，分析海水拌养珊瑚礁混凝土在TMC单体及耦合作用下的强度、变形响应规律，提出增强其耐久性的调控措施；建立极端恶劣海况条件下珊瑚礁混凝土结构物的长期服役性能评价方法，为我国南海珊瑚岛礁工程建设和长期稳定性评价提供科学依据。研究结果对于完善我国海洋工程地质学科以及推动岛礁工程建设具有重要的科学意义和指导价值。

中文关键词： 珊瑚岛礁；珊瑚礁混凝土；拌养；损伤机制；耐久性

英文摘要： To overcome the lack of building materials and cut the costs of marine transport, engineering construction on reefs of the South China Sea use local materials by using seawater coral concrete. In complex sea environment and severe sea condition, large area of damages appear on existing coral reef concrete structures, which directly affects safety and stability of coast defense engineering. The aim of the study is the damage mechanism and durability of coral reef concrete of the South China Sea, using combination of means of on-site investigation and sampling, laboratory simulation test, theoretical analysis, numerical modeling, exploring failure mode and effect law of seawater coral concrete. From macro to meso and then to micro-scale, obtain the damage mechanism of coral reef concrete that in response to rapid temperature change (T), splash detritus washes(M) and salt mist chemical erosion(C), analyze the strength and transformation response regularity of seawater coral concrete under coupling effect of TMC, to put forward measures to enhance its durability. Establish long term service performance assessment of coral reef concrete construction under extreme severe sea condition, to provide a scientific basis for engineering construction on reefs of the South China Sea and its long term estimation of stability. The research achievements will be of great scientific and instructional significance for perfecting the subject of ocean engineering geology of the country and promoting engineering construction on reefs.

英文关键词： coral island;coral reef concrete;mixing and curing;damage mechanism;durability