岩土工程学报2012，Vol.34Issue(8)：1412-1424,13.
油砂的蠕变特性与本构模型研究
Creep behavior of oil sand and its constitutive model
摘要
Abstract
Oil sand is a kind of sedimentary sands, whose pores are mostly filled with natural bitumen. As a strain softening material, the oil sand exhibits more complex creep behavior than the strain hardening materials, such as loose sand and normal consolidated clay. A series of triaxial creep tests are performed on the oil sand to obtain its creep behavior under different stress and strain states. The potential for creep is compared to that for plastic deformation. The concept of equivalent deformation processes is proposed and its microscopic mechanics is presented. The relation between creep rate and time, and that between creep rate and irreversible strain are discussed. An internal-variable creep model for the oil sand is proposed. In the model, the irreversible strain is considered as the internal variable for the description of oil sand creep. The creep behavior of both strain hardening and softening soils is postulated according to the critical state theory. The influence of shear band on the creep behavior of the oil sand is also investigated.关键词
油砂/三轴蠕变性质/蠕变模型/内变量/蠕变势/应变路径/临界状态/剪切带Key words
oil sand/triaxial creep behavior/creep model/internal variable/potential for creep/strain path/critical state/shear band分类
建筑与水利引用本文复制引用
王者超,Ron Wong,乔丽苹..油砂的蠕变特性与本构模型研究[J].岩土工程学报,2012,34(8):1412-1424,13.基金项目
中国博士后科学基金项目 （）
山东省优秀中青年科学家科研奖励基金项目 （）
教育部高等学校博士学科点专项科研基金项目 （）
