防灾减灾工程学报2018，Vol.38Issue(1)：7-13,7.DOI:10.13409/j.cnki.jdpme.2018.01.002
考虑损伤特征的冻风积土加载模型与试验研究
Study of Frozen Eolian Soil Loading Model and Experiment Considering Damage Characteristic
摘要
Abstract
In order to study the stress-strain relation and loading damage characteristics of frozen eolian soil under different temperatures and various levels of confining pressures,this paper obtained the stress-strain curves of frozen eolian soil specimens from triaxial shear tests under the condition of different negative temperatures and confining pressures.The expression of damage variable as a function of deviatoric stress was acquired by transforming Duncan-Chang nonlinear model according to the damage variables tangent modulus definition method,and a negative exponential governing equation with attenuation characteristics was introduced to describe the attenuation characteristics of tangent modulus with increasing deviatoric stresses.By substituting the governing equation of damage variable and tangent modulus into the damage constitutive relation,the load damage model of frozen eolian soil was deduced.The study found that:(1) the damage variable is dependent on the confining pressure and shear strength parameters (c、(ψ)) and is a constantly evolved variable in response to the deviatoric stress;(2) the loading damage model can describe the stress-strain relationship of frozen eolian soil under triaxial shearing conditions when the deviatoric stress is small.关键词
冻风积土/三轴剪切/应力—应变曲线/负指数控制方程/加载损伤模型Key words
frozen eolian soil/triaxial shear/stress-strain curve/negative exponential governing equation/load damage model分类
建筑与水利引用本文复制引用
张向东,李军,扈晓飞,胡跃龙,曲直..考虑损伤特征的冻风积土加载模型与试验研究[J].防灾减灾工程学报,2018,38(1):7-13,7.基金项目
国家自然科学基金项目(51504125)、高等学校博士学科点专项科研基金项目(20112121110004)资助 （51504125）
