水分-应力耦合作用下软岩的流变机理及其扰动状态理论模型

项目名称： 水分-应力耦合作用下软岩的流变机理及其扰动状态理论模型

项目编号： No.41202195

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 黄明

作者单位： 福州大学

项目金额： 23万元

中文摘要： 随着水环境下软岩工程建设的不断发展，软岩在含水状态下的长期变形与稳定性问题日趋突出，考虑水分-应力耦合作用的软岩流变机理研究已成为岩土工程界的基础性前沿课题之一。本课题拟结合软岩工程大变形灾害的实际问题，通过不同含水状态下软岩的常规抗压性能试验、三轴蠕变试验和实时CT扫描技术等手段，对软岩蠕变过程中的微观结构变化进行定性与定量分析；基于扰动状态理论和岩石非线性流变力学理论，从宏观和细观两个角度有效分析含水状态下软岩的时效变形破坏过程，重点研究水分-应力耦合作用下软岩流变的宏细观机理和参数的响应规律，以及扰动因子与细观结构演化的表征关系；构建基于扰动状态概念的软岩水分-应力耦合作用流变模型，并嵌入FLAC3D程序进行模型的有效性检验。课题研究将完善目前已有的岩石流变力学理论体系，为开展多因素影响下岩石的流变机理研究提供新的思路和方法，并为解决软岩工程的安全与稳定问题提供理论基础和分析手段。

中文关键词： 扰动状态理论；软岩；流变特性；崩解；本构模型

英文摘要： With the continuous development of soft rock engineering constructions in water environment, long-term stability of soft rock engineering under the condition of water becomes increasingly prominent, so its rheological mechanism of moisture-mechanical coupling has quietly become one of the basic topics at the forefront of geotechnical engineering. Combining with the practical problems of large deformation of soft rock engineering disasters, qualitative and quantitative analysis for the microscopic structural changes in the soft rock during the creep process is taken firstly, in terms of the conventional compression performance tests、triaxial creep test and real-time CT scan. Based on the disturbed state concept and rheology theory, the soft rock creep damage process under the condition of water is effectively analyzed by integrating two angles of macro- and meso-. More importantly, rheology macro microscopic mechanism of soft rock and response law of the parameters considering moisture-mechanical coupling are further researched, and representation of relationship between disturbance factor and meso-structure evolution is researched too. On this basis, the coupled moisture-mechanical rheological model based on disturbed state concept is presented, and the model validity is tested by comparing the theoretical and e

英文关键词： disturbed state concept；soft rock；rheological properties；slaking；constitutive model