摘要
高坝工程坝肩边坡岩体深部层间错动带的蠕变力学特性与蠕变损伤特性,直接影响着水电工程的长期稳定性与整体安全性。以某坝肩高边坡岩体层间错动带的剪切蠕变力学试验为基础,研究了层间错动带的剪切蠕变力学特性,分析了层间错动带的长期剪切强度参数和加速蠕变特性及蠕变速率变化特征;通过对层间错动带加速蠕变过程中损伤演化特性的分析,研究了考虑层间错动带岩体力学参数弱化和伴随加速蠕变变化的蠕变损伤效应,并基于西原流变模型和蠕变损伤演化方程,建立了能够反映高边坡层间错动带蠕变损伤演化过程的本构模型;而后通过对比数据拟合结果与试验结果,对提出的本构模型进行验证,显示所建立本构模型的正确性与合理性。
The creep characteristics and damage properties of interlayer shear belt of high abutment slopes affect the long-term stability of high dam projects.The shear creep mechanic characteristics of interlayer shear belt are studied based on the shear creep mechanic test,and the long-term shear strength parameters,accelerated creep properties and change rules of shear creep rate are analyzed.By analyzing the rules of creep damage evolution of interlayer shear belt,the damage degradation effects of mechanical parameters over time and over accelerated creep are discussed.Based on the Nishihara creep model and the creep damage evolution equations,a creep damage model is proposed to reflect the creep damage process of interlayer shear belt of slopes completely.The comparison between the calculated results of creep damage model and the test results show that the proposed creep damage model for interlayer shear belt of slopes is available and reasonable.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2013年第9期1675-1682,共8页
Chinese Journal of Geotechnical Engineering
基金
陕西省重点科技创新团队项目(2013KCT-015)
关键词
坝肩高边坡
层间错动带
剪切蠕变力学试验
蠕变本构模型
参数损伤劣化效应
high abutment slope
interlayer shear belt
shear creep characteristic test
creep constitutive model
damage degradation effect of parameters
