摘要
利用自行研制的W3Z-200型冻土三轴压缩蠕变仪,对淮南地区深表土冻土进行了三轴蠕变试验。根据试验结果,提出以标准黏弹塑性模型为基础,并耦合温度自由度,应用抛物线型屈服准则对模型中的黏塑性项进行改进,建立了新的本构模型来描述高围压复杂应力状态下冻土的蠕变变形特征。基于ADINA有限元软件平台,开发了冻土本构子程序。对淮南某冻结井筒开挖过程进行了数值模拟,计算结果验证了冻土抛物线型黏弹塑本构模型的正确性和合理性。
The triaxial creep experiment of artificial frozen soil in deep alluvium is performed by using self-developed a W3Z-200 apparatus of tdaxial creep frozen soil. Analyzing the experiment results, applying parabolic yield criterion for improved viscoplasticity in the Nishihara model and coupling degree of temperature, a new creep constitutive model is established for describing frozen-soil＇s creep characteristics under the complicated stress state. The model is embedded in nonlinear ADINA finite element program in order to numerically analyze easily. Numerical simulation of the shaft well excavation process and field measurements of deformation of deep soil frozen wall are performed in Huainan Mine; and the results show that the established parabolic yield-surface constitutive model is correct and reasonable for FEM numerical simulation of deep soil frozen wall.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第9期1943-1948,共6页
Rock and Soil Mechanics
基金
安徽省高校青年教师基金资助(No.2007JQ1044)
安徽省自然科学基金资助(No.050440501)
安徽理工大学青年教师基金资助(No.QN200607)
关键词
复杂应力
三轴蠕变
抛物线型屈服面
人工冻土
complex stress condition
triaxial compressive creep
parabolic yield-surface
artificial frozen soil
