摘要
对西龙池下水库的坝体主堆石料和坝基覆盖层料进行蠕变试验研究,对其蠕变机制和模型进行探讨,并对蠕变模型参数的影响因素和取值范围进行分析。西龙池下水库主堆石料和覆盖层料的轴向和体积蠕变特性可以用幂函数来描述,式中的模型参数可根据试验得到的蠕变特性确定。主堆石料的轴向初始蠕变a随着应力水平的提高而增大,可以用指数函数描述,其轴向蠕变指数b随着应力水平的提高而明显减小,可以用线性函数描述。根据试验成果,给出其他参数的取值范围。
The creep behaviors and models of Xilongchi main rockfill and dam foundation gravel are studied through triaxial creep tests.The factors and value range of creep model parameters are analyzed.Based on the test results,the axial and volumetric creep characteristics can be described by a power function in which model parameters are determined by test for creep characteristics.With the stress level increasing,the initial axial creep a of the main rockfill increases while the axial creep strain exponential b decreases obviously,which can be described by exponential function and linear function respectively.The change ranges of the other parameters are achieved by the test results.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2009年第A02期3376-3382,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(50679091)
关键词
岩石力学
堆石料
蠕变
应力水平
围压
模型参数
rock mechanics
rockfill
creep
stress level
confining pressure
model parameters
