干湿循环作用下岩石累积损伤机理研究

项目名称： 干湿循环作用下岩石累积损伤机理研究

项目编号： No.51308567

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 建筑科学

项目作者： 傅晏

作者单位： 重庆大学

项目金额： 25万元

中文摘要： 水－岩相互作用作为岩土工程相关学科研究的前沿领域，是工程岩土体稳定研究的重要内容，而干湿循环过程是水－岩相互作用的重要组成。干湿循环过程中，岩石改变了水的赋存状态，同时自身也受到水的反复侵蚀。干湿循环作用将造成岩土体岩性劣化，进而影响其强度和变形，并对岩土工程的稳定性和耐久性产生重要影响。因此，通过室内岩石的干湿循环试验，分析岩石微观结构组成、矿物成分、基本物理参数、水理性参数、力学参数等的变化规律，并建立相应的累积损伤模型，对于揭示干湿循环作用下岩石劣化机理具有重大意义，同时为库区消落带内岩石的风化特征、库岸崩滑演化模式等方面研究提供有力的理论基础，也有利于促进水－岩相互作用理论和环境岩土工程的发展。

中文关键词： 干湿循环；损伤演化；弹塑性本构；化学动力学；颗粒流

英文摘要： As the advancing edge of geotechnical engineering and its related science studies, water-rock interaction is a crucial content of the study of the stability of engineering rock-mass and soil. And in the procedure of cyclic drying-wetting, which is one of water-rock interaction's important compositions, rock-mass altered the current state of water, while suffering repeated erosion itself, which would result in the deterioration of rock and soil, influence its the strength and deformation parameters, and leave significant effect on the stability and durability of geotechnical engineering.So through wetting-drying test of rock sample in laboratory,analyzing variation law of rock microstructure composition, mineral content, basic physical parameter, rational parameters of water, mechanical parameters,for revealing the rock degradation mechanism under wetting-drying cycle test,has the great significance. At the same time, it provides strong theoretical foundation for studying rock weathering characteristics of hydro-fluctuation belt in the reservoir area and the evolution mode of reservoir banks collapse,etc.It is also conducive to promote the water-rock interaction theory and the environmental geotechnical engineering development.

英文关键词： dry-wet cycle；damage evolution；elastic-plastic constitutive model；chemical kinetics；Particle Flow Code