Ensuring the long-term stability of the pile foundation in ice-rich frozen soil areas is the key to the safe use of bridge pile foundations in permafrost areas.In order to analyze the influence of ice content on the creep characteristics of the frozen sand-concrete interface,the creep tests of the frozen sand-concrete interface with ice content of 6%,12%,16%,23%,36%,60%,and 80%were carried out under-2℃by using self-designed large-scale shear apparatus.According to the test results,except for the accelerated creep of the specimen with 6%ice content,other specimens only experience decay creep and stable creep stages under constant shear stress.With the increase in ice content,the proportion of viscous deformation in the specimen increases,and the viscous deformation in the specimen with 80%ice content exceeds 80%of the total deformation.The stable creep speed is affected comprehensively by the dry density and ice content and is the lowest when the ice content is 16%.Burgers viscoelastic model can simulate the creep curve of frozen sand-concrete interface with high ice content better.With the increase in ice content,the initial shear modulus and viscosity coefficient at the stable creep stage increase first and decrease then.The progressive shear modulus at the initial creep stage decreases exponentially,and the viscosity coefficient at the initial creep stage increases exponentially.
关键词
高含冰量冻土/冻结砂土/接触面/蠕变试验/黏弹性模型
Key words
ice-rich frozen soil/frozen sand/interface/creep test/viscoelastic model
维普
万方数据