摘要
针对元件组合流变模型多半反映的是蠕变线性关系或发生加速蠕变时间过快的不足,根据工程现场压缩蠕变试验成果,提出工程岩体流变效应的损伤因子,建立非线性损伤黏弹塑性本构模型,通过ABAQUS编制程序并采用压缩蠕变试验的数值模拟,验证蠕变模型和编制程序的正确性。最后,将此非线性蠕变损伤模型应用于大岗山水电站地下厂房的施工开挖全过程的数值仿真,并对考虑损伤和未考虑损伤2种工况的计算结果进行对比分析,结果表明,考虑岩体损伤工况下的围岩体塑性屈服范围和程度、洞壁位移值趋势能更客观地反映工程岩体的变形和破坏特征。
Aiming at the shortcomings of component creep models,such as linear constitutive relationships,converging easily and entering accelerative stage too quickly,a new empirical nonlinear damage viscoelasto-plastic model which can reflect rock creep damage effect is put forward based on creep experiments.The model is verified to be correct by means of simulating a uniaxial compression numerical test which makes use of user′s subroutines of ABAQUS.Finally,the model is applied to simulating the whole construction process of Dagangshan underground powerhouse under two working conditions,with and without considering damage factor,respectively.By comparing the results two working conditions,it is demonstrated that the results of considering damage factor working condition can bring forward more reasonable reference than that of without considering damage factor,especially in plastic zone,damage degree and deformation of rock mass.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2010年第6期1184-1191,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金面上项目(40772184)
国家自然科学基金重大国际合作项目(50720135906)
中国科学院重要方向性项目(KJCX–YW–506)
关键词
岩石力学
蠕变
本构模型
非线性
深部岩体
施工过程
rock mechanics
creep
constitutive model
nonlinearity
deep rock mass
construction process
