摘要
结构性土在受荷变形过程中,随着结构的破损,土体的力学性质逐渐由天然状态向完全破损状态(重塑状态)转变,而损伤变量及其演化规律是反映这种转变的核心所在。从损伤耗能的角度,定义了适应结构性土损伤机制的损伤变量表达式。从体应变与剪应变引起的土体损伤耗能不同机制,按照相容概率事件的叠加原理,建立了一般应变状态下土体损伤演化规律的基本表达式。通过一系列的结构性土的三轴压缩试验结果分析,得出了该土体的损伤演化方程,揭示了体应变与剪应变引起的损伤遵守不同的演化规律。理论计算结果与试验吻合,表明按此方法得到的损伤演化方程能够较好的反映结构性土的应力应变关系。
In the process of loading and deformation,the mechanics charactevistics of structured soils will be changed from natural state to damage state（remolded state）with the damage of structure;the damage variable and its evaluation equation are core to reflect the change.The variable expression is given for structured soils damage from the basic idea that damage is a course of energy dissipation.From the different mechanism of energy dissipation aroused by volumetric strain and shear strain,a basic expression that suits to general strain condition is put forward based on principle of superposition of compatible probability event.Through the analysis of the triaxial compression test,the damage evaluation equation to structured soils is set up,and it is revealed that the damage aroused by volumetric strain and shear strain abides by different evaluation law.Numerical calculation result can reflect the text perfectly,and it indicates that the method can reflect the stress-strain relation of structured soils perfectly.
出处
《土木建筑与环境工程》
CSCD
北大核心
2017年第5期40-48,共9页
Journal of Civil,Architectural & Environment Engineering
关键词
结构性土
损伤
能量耗散
演化方程
structured soils
damage
energy dissipation
evaluation equation
