摘要
结合岩石破坏特征,将岩石变形分解为弹性变形和由于微裂缝滑移的塑性变形两部分,由此提出一种细观损伤单元,发展了一类细观损伤物理模型,并从细观层次上解释岩石受压应力-应变关系中的非线性和应变软化现象;基于平衡和变协调条件,建立弹塑性受压本构关系模型,并建议了塑性变形的简化计算方法,利用统计损伤理论和优化算法,确定损伤演化方程,并探讨模型参数与围压的经验关系,进而建立起基于特定围压下的岩石损伤本构关系预测方法.该方法与已有试验结果相比较,结果吻合较好.
Based on the failure mechanism of rock,a new meso-scopic damage element is put forward.Total strain is composed of elastic component and plastic component to model the slip of cracks.A meso-physical damage model,which is composed of sets of elements parallelized with rigid rods,is developed.The nonlinear performance and strain softening of the curve are analyzed from the view of meso-scopic level.With the help of force equilibrium and deformation compatibility,damage constitutional model of the rock material under monotonic compressive loading is deduced,and a simplified method to calculate the plastic strain is also suggested.By making use of statistical damage theory and optimized method,a statistical damage evolution equation is established,and the relation between the parameters of the model and specific confining pressure is discussed and set up based on the experimental results on the rock subjected to monotonic compressive loading under differential confining pressures.It is found that the calculated curve has a good agreement with the result of experiment＇s.
出处
《郑州大学学报（工学版）》
CAS
北大核心
2010年第6期6-9,共4页
Journal of Zhengzhou University（Engineering Science）
基金
河南省教育厅自然科学基金项目(2009B560011)
关键词
岩石
弹塑性本构模型
细观损伤
应变软化
围压
rock
elasto-plastic constitutive model
meso-scopic damage
strain softening
confining pressure.
作者简介
杨卫忠（1966-），男，江苏张家港人，郑州大学副教授，博士，从事材料的损伤本构理论研究，E—mail：ywz6518@hotmail．com．
