岩石蠕变损伤模型及其稳定性分析  

Rock creep damage model and its stability analysis

作　　者：王来贵[1] 赵娜[1] 何峰[1] 李鑫[1] 

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000

出　　处：《煤炭学报》2009年第1期64-68,共5页Journal of China Coal Society

基　　金：国家自然科学基金重点资助项目(50434020);国家自然科学基金资助项目(50374042);辽宁省科学技术基金资助项目(20022155)

摘　　要：采用微分方程描述方法,建立了单轴和三轴情况下岩石全程应力应变过程中的非线性蠕变损伤模型,分析了岩石的蠕变损伤过程和对应阶段的稳定性,讨论了蠕变损伤过程中模型参数的变化规律及其对应的稳定性.第1阶段蠕变对应系统状态是稳定的;第2阶段是随遇平衡;第3阶段是非稳定的,在外界扰动下会失稳.利用软岩在第3阶段蠕变损伤的对应加速蠕变特性,编写有限元程序模拟岩石的损伤过程,可为预测、预报系统的失稳现象提供理论依据.The nonlinear creep damage modal was built in the whole stress and strain process under uniaxial and triaxial conditions with the describing method of differential equation. The changing rule of model parameters in the creep damage process and its corresponding stability were discussed. In different level of stress there are different corresponding creep damage processes. In the first stage of creep the corresponding system is stable ; in the second stage of creep the system is balant, while in the third stage of creep, the system is unstable, which will lose bal- ance under external disturbance. Making use of the characteristic of the corresponding accelerated creep of soft rock in the third stage and working out the finite element program to simulate rock damage process, which can provide theretical basis for predicting and forecasting the destabilizing phenomena of the system.

关 键 词：蠕变损伤 稳定性 非线性 软岩 蠕变失稳 

分 类 号：TU457[建筑科学—岩土工程]