摘要
目的为了更明确地研究岩石试件蠕变过程中反馈特性与稳定性的对应关系.方法采用系统分析的方法,建立了岩石非线性蠕变模型,对岩石试件的蠕变过程和反馈特性进行了描述和分析,讨论了蠕变过程中模型参数及其反馈特性和模型的稳定性.结果在蠕变过程中,第Ⅰ阶段蠕变为负反馈,对应的系统状态是稳定的;第Ⅱ、Ⅲ阶段蠕变为正反馈,对应的系统状态是非稳定的,在外界扰动下会导致失稳.结论利用岩石在第Ⅲ阶段蠕变的正反馈对应加速蠕变特性,可为预测、预报系统的失稳现象提供理论依据.
In order to study the relation between the feedback characteristics and the stability in the creep process of rock specimen, using the system analysis method, the paper establishes the nonlinear creep model of the rock, describes and analyzes the feedback characteristics in the creep process of rock specimen, and discusses the parameters of the model and the feedback characteristics in the creep process of rock specimen and its stability as well. In the process of creep, the first stage of creep is negative feedback while the system is stable; the second and the third are positive feedback while the system is unstable, and moreover, the system will lose instability under external disturbs. The result shows that with the characteristic that the positive feedback of the rock＇s 3rd stage corresponds to the acceleration creep, the paper can provide the theoretical foundation for predicting the systematic instability.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
2006年第5期736-739,共4页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金重点项目(504334020)
面上项目(50374042)
辽宁省科学技术基金(20022155)
教育厅重大基础研究资助(202182055)
关键词
蠕变
反馈
稳定性
蠕变失稳
creep
feedback
stability
instability of creep
