岩石非线性变形特性与强度特性的时温等效效应研究

项目名称： 岩石非线性变形特性与强度特性的时温等效效应研究

项目编号： No.11302242

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 朱元广

作者单位： 中国科学院武汉岩土力学研究所

项目金额： 30万元

中文摘要： 处置库围岩力学性质的长期演化规律关系到高放废物处置库的长期安全性。然而，通过室内试验只能获得短期的岩石力学性质数据，因而需要解决"如何利用短期的试验数据去分析预测岩石力学性质长期演化规律"问题。基于对岩石力学性质温度和时间效应的研究以及这两种因素之间等效规律的揭示，可以推断利用岩石的时温等效原理能够解决这一难题。项目拟采用室内试验、理论分析和数值模拟相结合的方法，开展岩石非线性变形特性与强度特性的时温等效效应研究。基于非线性黏弹性一般理论，建立非线性黏弹性时温等效效应的数学表达方程；以甘肃北山花岗岩为研究对象，通过不同温度及应力下的蠕变试验，研究花岗非线性变形特性和强度特性的时温等效效应，揭示花岗岩力学性质长期演化规律，建立花岗岩力学性质的本构模型和强度准则；在此基础上，发展岩石时温等效效应的数值分析方法，预测高放废物处置库的长期稳定性，为我国高放废物处置库的安全性评价提供理论依据。

中文关键词： 高放废物；时温等效；蠕变；本构模型；

英文摘要： The evolution law of mechanical properties of surrounding rock in a long time period has great influence on the safety of high-level radioactive waste repository. However, due to the limitation of testing time, the rheological test data of rock could be obtained must be confined within a short time period. Therefore, the problem comes down to how to use the short time test data to predict the long time evolution law of rheological properties of rock. At present, only the method of using time temperature equivalent effect of rock could scientifically solve this problem. Methods combining experimental test, theoretical analysis and numerical simulation are carried out to study the time temperature equivalent effect of deformation and strength properties of rock. Based on the nonlinear viscoelastic theory, the time temperature equivalent equations of nonlinear viscoelastic properties of rock are established. Creep tests of granite at different temperatures and stresses are carried out to study the time temperature equivalent effect of deformation and strength characteristics of granite. The long time properties of granite are revealed and the mechanical model and strength criterion are built. With these research results, the numerical method of time temperature equivalent effect is developed, and the long time stab

英文关键词： high-level radioactive waste；time-temperature equivalent；creep；constitutive equation；