考虑主应力轴旋转Gudehus-Bauer亚塑性模型的改进  

AMELIORATION OF GUDEHUS-BAUER HYPOPLASTIC MODEL CONSIDERING PRINCIPAL-STRESS-AXE ROTATIONS

作　　者：熊保林[1] 邵龙潭[2] 

机构地区：[1]石家庄铁道学院土木分院,石家庄050043 [2]大连理工大学工业装备结构分析国家重点实验室,大连116024

出　　处：《工程力学》2008年第1期127-132,共6页Engineering Mechanics

摘　　要：基于非线性连续介质力学的基本原理,提出了一个考虑主应力轴旋转改进的Gudehus-Bauer亚塑性模型。新改进的Gudehus-Bauer亚塑性模型强调应力增量的大小和方向不仅与当前应力状态有关,而且还取决于当前应变增量的大小和方向。模型中4个参数可由休止角,最大孔隙比以及最小孔隙比估计出来;而其它4个参数可由等向压缩实验、三轴压缩实验以及密砂的侧向压缩实验确定。最后,通过算例把改进后模型数值模拟结果与有关实验资料做了比较,结果表明改进的Gudehus-Bauer亚塑性模型可以考虑主应力轴旋转对砂土强度和变形特性的影响。Based on basic principle of nonlinear continuum mechanics, the ameliorated Gudehus-Bauer hypoplastic model considering the rotation of principal stress axes is presented. The ameliorated model insists that the magnitude and direction of stress increment depend on the current stress state and the bulk and direction of current strain increment. The four parameters of the model are estimated by the angle of repose, minimal void ratio, maximal void ratio, and the other four parameters are determined by equivalent compression test, triaxial compression test and oedometric test of dense sand. Finally, the computing results of the ameliorated model are compared with the relevant experimental data by the cases. The results show that the revised Gudehus-Bauer hypoplastic model can take strength and deformation of sand under principal stress axes rotation into consideration.

关 键 词：Gudehus-Bauer亚塑性模型 主应力轴旋转 改进 非线性连续介质力学 砂土 

分 类 号：O33[理学—一般力学与力学基础] TU441[理学—力学]