应力—腐蚀耦合作用下岩石流变失稳过程的细观机理及模型研究

项目名称： 应力—腐蚀耦合作用下岩石流变失稳过程的细观机理及模型研究

项目编号： No.51474046

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 矿业工程

项目作者： 唐世斌

作者单位： 大连理工大学

项目金额： 82万元

中文摘要： 本项目以矿山、水电等岩体工程经常存在的水、汽、热等腐蚀环境中的流变失稳灾害为研究背景，围绕腐蚀介质迁移-应力腐蚀-损伤演化-流变失稳的研究主线，深入开展腐蚀环境中岩石流变失稳的细观机理、理论与模型研究。运用SEM、CT、MTS、双扭、四点杠杆式加载等细宏观实验手段，以及化学动力学、细观损伤力学等理论，研究腐蚀环境下岩石力学性质变异的机理，揭示应力-腐蚀之间的耦合作用机制，建立基于腐蚀过程的岩石细观损伤演化本构关系，提出腐蚀介质在岩石中的扩散模型，建立描述应力-腐蚀耦合作用下岩石流变失稳的数值模型，实现基于高性能并行计算机系统的破坏处理、方程求解与模型显示。通过深入探讨应力腐蚀诱发岩石流变失稳过程中的裂纹萌生、扩展和贯通机制及时空演化规律，揭示岩石流变现象的内在演化机理，为岩石流变失稳控制与防治、工程岩体长期稳定性预测提供基础理论和研究方法。

中文关键词： 应力腐蚀；流变失稳；时效变形；数值模拟；并行计算

英文摘要： In the mining and hydroelectric engineering, the water, moisture and temperature conditions always cause the rhelogy instability, even result in hazards. Threrefore, this project is aim to study the mesoscopic mechanism and the model of rheology in rock as it under the corrosive environments conditions. The experimental,theoretical and numerical methods are used to study the corrosion media transfer,stress corrosion,mesodamage evolution and rhelogical instability processes. By using the SEM, CT, MTS, double twist, four points loading equipment and the chemical kinetics, meso-damage mechanics theory, we will study on the mechanism of mechanical properties variation in rock under corrosive environment, propose a diffusion model of corrosive media in the rock, and establish the meso-damage constitutive law based on the stress-corrosion coupling. Furthermore, we also implement the numerical model on the high-performance computing system. Finally, by studying the crack initiation, propagation and coalescence process during the stress corrosion induced rheological instability, it will further reveal the internal mechanism of rheological phenomena, and helpful for the long-term rheological instability controlling, forecasting and applications.

英文关键词： stress corrosion;creep rupture;time-dependent deformation;numerical modelling;parallel computing