摘要
在Burgers模型的基础上,应用损伤力学的原理,通过引入3种不同的损伤变量演化规律,建立了改进Kachanov蠕变损伤模型、应变控制蠕变损伤模型和统计损伤模型,模拟向家坝砂岩三轴蠕变试验,并进行模型参数辨识及参数敏感性分析.3种蠕变损伤本构模型都能够较好地模拟蠕变全过程曲线,且各模型对曲线的模拟有着各自的特点.对比分析各个蠕变损伤模型,说明了提出的3种蠕变损伤本构模型都能够很好地反映砂岩的流变特性,但相比而言统计蠕变损伤模型更具有优势.本文研究为岩石工程的长期稳定性分析提供了理论参考.
Based on Burgers＇ model and the application of damage mechanics,by introducing three different damage evolution laws,three types of creep damage model（modified Kachanov＇s model,strain-controlled creep damage model and creep damage model based on statistical theory） are established to simulate the triaxial creep test on Xiangjiaba sandstones.In addition,the models＇ parameters are identified by the test data and the sensibility of the parameters is investigated.The three creep damage models can all simulate the whole creep process of Xiangjiaba sandstone,and each model has its own characteristics.The comparison of the three creep damage models shows that the three creep damage constitutive models can all describe the rheological behaviour of sandstone but that the creep damage model based on statistics theory is the best.This study could provide a theoretical reference for the long-term stability analysis of rock engineering project.
出处
《三峡大学学报（自然科学版）》
CAS
2010年第6期55-60,共6页
Journal of China Three Gorges University：Natural Sciences
基金
教育部博士点基金(新教师类)资助项目(20090094120016)
河海大学自然科学基金(工科类)资助项目(2008428311)
中央高校基本科研业务费专项资金资助项目(2009B14014)
